68" SR TRIPLEX – CE
OWNER'S MANUAL
Includes Operation, Maintenance and
Parts Lists for SR 68" and DL 68"
700 Raymond Ave., P.O. Box 14299, St. Paul, Minnesota 55114-0299, U.S.A.
NATIONAL MOWER CO.
Phone (651) 646-4079 – Fax (651) 646-2887
www.nationalmower.com
OCTOBER – 2001
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NATIONAL® 68" SR & DL TRIPLEX – CE
TABLE OF CONTENTS
Declaration Of Conformity............................................................................... 4
Specifications
Dimensions – Mower ................................................................................ 5
Engine – Briggs & Straton ...................................................................... 5
Disposal Numbers .................................................................................... 5
Noise Emission and Vibration .................................................................. 5
Safe Operating Practices ................................................................................ 6
Decal (Transfer) Identification................................................................... 7 & 8
Introduction ..................................................................................................... 9
Receipt Of Shipment ....................................................................................... 9
Uncrating Instructions ..................................................................................... 9
Assembly Instructions
Rear Mower .................................................................................... 10 & 11
Seat ................................................................................................ 10 & 11
Wing Mowers .................................................................................. 10 & 11
Engine ............................................................................................ 10 & 11
Differential ...................................................................................... 10 & 11
Maintenance
Lubrication .............................................................................................. 13
Bed Knife Replacement .......................................................................... 14
Lapping and Grinding Procedures......................................................... 15
Adjustments
Height Of Cut .......................................................................................... 16
Reel To Bed Knife Adjustment ............................................................... 16
Reel End Play Adjustment ...................................................................... 16
Brake Adjustment ................................................................................... 17
Wing Mower Drive Belt Tension ............................................................. 17
Rear Mower Drive Belt Tension ............................................................. 17
Engine Drive Belt Tension ...................................................................... 17
Main Drive Belt Tension ......................................................................... 17
Troubleshooting ............................................................................................ 18
Wiring Diagram—SR Electrical Interlock ...................................................... 18
Parts List
Ordering Information............................................................................... 19
Frame and Running Gear............................................................... 20 & 21
Rear End ........................................................................................ 22 & 23
Drive Mechanism and Wing Mower Supports ................................ 24 & 25
Rear Mower .................................................................................... 26 & 27
Wing Mower.................................................................................... 28 & 29
Drive and Mower Skids and Shields....................................................... 30
Deluxe 68" Running Gear and Misc. Parts............................................. 31
Deluxe 68" Drive Parts ................................................................... 32 & 33
Deluxe 68" Electrical Diagram ........................................................ 34 & 35
3
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DECLARATION OF CONFORMITY
according to Directive 89/392/EEC
We
NATIONAL MOWER COMPANY
..............................................................................................................................................................
(Name of supplier)
700 Raymond Avenue, St. Paul, Minnesota 55114 U.S.A.
..............................................................................................................................................................
(Full address of the manufacturer—authorized representative in the community must also give the
business name and address of the manufacturer)
declare under our sole responsibility, that the product
68" NATIONAL TRIPLEX MOWER
(Make and model)
to which this declaration relates corresponds to the relevant basic safety and health requirements of
the Directive 89/392/EEC, (if applicable)
and to the requirements of other relevant Directives:
EN292-1&2--EN294--EN349
..............................................................................................................................................................
(Title and/or number and date of issue of the other Directives)
(If applicable)
For the relevant implementation of the safety and health requirements mentioned in the directives,
the following standard(s) and/or technical specification(s) has (have) been respected:
ANSI B71.4
..............................................................................................................................................................
(Title and/or number and date of issue of standard(s) and/or technical specification(s))
St. Paul, MN, USA
10/15/2001
(Place and date of issue)
(Name, function and signature of the authorized person)
4
68OMCE-10/01-350
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NATIONAL® 68" SR & DL TRIPLEX – CE
SPECIFICATIONS
DIMENSIONS & WEIGHT– MOWER
Overall Length.............................................................................................. 79.13" (201 cm)
Width, Wing Mowers Folded .......................................................................... 61.8" (157 cm)
Width, Wing Mowers Down ............................................................................... 76" (193 cm)
Height............................................................................................................ 39.37"(100 cm)
Weight (empty)......................................................................................... 639.5 lbs. (290 kg)
ENGINE – BRIGGS & STRATTON
Engine Type .............................. Forced Air Cooled, 4-cycle, Horizontal Shaft, OHV Engine
Number Of Cylinders ...................................................................................................... One
Bore and Stroke .......................................................................... 2.99" x 2.17" (76 x 55 mm)
Piston Displacement .................................................................................................... 215cc
Maximum Horsepower .................. 7.5 hp (5.6 kW)) / 3600 rpm (Corrected per SAE J1349)
Maximum Torque ............................................................ 12.5 ft/lbs (16.5 N-m) at 2500 rpm
Direction Of Rotation............................................ Counterclockwise Facing The PTO Shaft
Fast Idle Speed .......................................................................................................4000 rpm
Slow Idle Speed ......................................................................................................1750 rpm
Fuel ............................................................................................ Unleaded Gasoline (Petrol)
Fuel Tank Capacity .................................................................................... 4.80 US qt (4.54)
Minimum Specific Fuel Consumption Ratio ...............................240 gr/hp-hr (322 gr/kW-hr)
Oil ................................................................................................... Engine Oil SAE 10W-30
Oil Capacity.................................................................................................. 1.90 US pt (.90)
Carburetor ............................................................................. Float Type with Fixed Main Jet
Balancing ......................................................................................... Reciprocating Balancer
Ignition .......................................................................... Flywheel Magneto, Transistor Type
Spark Plug ...................................................................................................... Resistor Type
Starter ................................................. Recoil Starter with Automatic Compression Release
Governor ............................................................................................................. Mechanical
Lubrication Type ..........................................................Splash with Low Oil Shut-off System
Air Cleaner ....................................................................................................... Dual Element
Muffler ........................................................................................................... Low Tone Type
Lighting Coil ......................................................................................................... 12 V–25 W
Charging Coil ................................................................................................................. 10 A
Net Weight (Engine).................................................................................. 59.1 lbs (26.8 kg)
Dimensions (L x W x H) ........................... 13.5" x 15.6" x 17.0" (344.5 x 395.5 x 432.5 mm)
DISPOSAL NUMBERS
Gasoline (Petrol), Lead Free .......................................................................................54104
Engine Oil .................................................................................................................... 54112
Fiberglass Parts ...........................................................................................................57103
Tires ............................................................................................................................. 57502
Gear Oil........................................................................................................................ 54112
Grease .........................................................................................................................54202
Plastic Tanks................................................................................................................ 57127
NOISE EMISSION AND VIBRATION
Sound*: Operator Position ...................................................................................... 86 dBA
Sound Power Level (LwA) ........................................................................ 99 dBA
Vibration*: Maximum Vibration 16.1 m/s2 RMS
Location ................................................................................................ Left Hand
*Operating Condition: Engine rpm–3400, Unit Stationary
5
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IMPORTANT
National Mower Safe Operation Practices
For Riding Mowers
1. Know control functions and how to stop quickly. READ THE OWNER’S MANUAL.
2. Wear approved safety glasses or goggles when operating the mower.
3. Do not allow children to operate mower. Do not allow adults to operate mower without proper instruction.
4. Do not carry passengers. Keep children and pets at a safe distance from an operating mower.
5. Clear the work place of objects which might be picked up by the blades and thrown.
6. Disengage all reel clutches and shift into neutral before attempting to start the engine (motor). Disengage main
clutch before shifting reel clutches.
7. Disengage power to the reels and stop the engine (motor) before leaving the operator’s position.
8. Disengage power to the reels and stop the engine (motor) before making any repairs or adjustments.
9. Disengage power to the reels when transporting or not in use.
10. Take all possible precautions when leaving the mower unattended, such as, shifting into neutral, setting the
parking brake, stopping the engine and removing the ignition key.
11. Do not stop or start suddenly when going uphill or downhill. Mow up and down the face of steep slopes – never
across steep slopes. Do not exceed a slope of 25o in any direction.
12. Reduce travel speed on slopes and in sharp turns to prevent tipping or loss of control. Use extreme caution
when changing direction on slopes.
13. Watch for holes in the terrain and other hidden hazards.
14. Watch for dangerous traffic when crossing or near roadways.
15. Never direct the discharge of material from operating reels toward bystanders nor allow anyone near the mower.
16. Handle gasoline (petro)l with CAUTION - it is highly flammable.
a. Use an approved gasoline (petrol) container.
b. Never remove the fuel tank cap or add gasoline (petrol) to a running or hot engine. Never fill the fuel tank
indoors. Wipe spilled gasoline (petrol) immediately.
c. Open garage doors to allow ventilation if engine is run inside – exhaust fumes are dangerous. Do not run
engine in any enclosed area.
17. Keep the mower in good operating condition. Make sure that all safety switches are operating properly and
all safety guards are in place at all times, except during servicing.
18. Keep all nuts, bolts, and screws tight to be sure that the mower is in a safe working condition.
19. Never store the mower, with gasoline (petrol) in the tank, inside a building where fumes could reach an open flame
or spark. Allow the engine to cool before storing in any enclosure.
20. Keep the engine free of grass, leaves or excessive grease to reduce a fire hazard.
21. The mower and reels should be stopped and inspected for damage after striking a foreign object. The damage
should be repaired before restarting and operating the mower.
22. Do not change the engine governor settings or overspeed the engine.
23. Proceed as follows when mowing:
a. Mow only in the daylight or in good artificial light.
b. Never make a cutting height adjustment while the engine (motor) is running.
c. Shut the engine (motor) off when removing grass or unclogging reels.
24. This machine is to be used only as a grass cutter or lawn mower.
WARNING– California, USA residents are required by law (CA PRC 4442 & CA H & SC 13005) to equip their
engines with spark arresters when operating in flammable vegitation. Arresters must be obtained from your
engine dealer and are not available from National Mower Company.
6
68OMCE-10/01-350
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NATIONAL® 68" SR & DL TRIPLEX – CE
TRANSFER IDENTIFICATION
1
NATIONAL MOWER CO.
700 RAYMOND AVE.
ST. PAUL, MINNESOTA 55114 USA
651-646-4079
FAX 651-646-2887
2
3
YEAR OF MANUFACTURE: 2000
POWER RATING: 7.5 (5.6 kW) at 3600 RPM
WEIGHT: 639.5 lbs (290 kg)
4
5
7
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6
9
NO.
TRANSFER DESCRIPTION
PART NO.
1
2
07358
07358
Do not exceed 25o slope. Located on main belt shield.
Manufacturer's identification and specifications. Located
on the main belt shield.
3
07358
Read Operator's Manual. Refer to manual for adjustments.
Caution: Machine is used only as a lawn mower. Keep
bystanders. Located on main belt shield.
away
4
5
07363
07363
Sound power level. Located on main belt shield.
Sound Level, operator's position. Located on main belt
shield.
6
7
8
9
07359
07359
07359
07359
Forward, Neutral and Reverse positions. Located on main
belt shield.
Rear mower clutch engagement. Located on the rear
mower shield.
Wing mower clutch engagement. Located on main belt
shield.
Engine clutch lever: Back, Neutral & Forward. Located on
main belt shield.
8
68OMCE-10/01-350
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NATIONAL® 68" SR & DL TRIPLEX – CE
INTRODUCTION
This machine has been designed to meet European
CE Safety Standards. Metric eqivalents are provided
wherever possible for users outside the United States.
informationwillgladlybefurnishedbycallingorwritingthe
manufacturer or his authorized agent.
Please furnish us with the Model Number, Serial
Number and Date of Purchase when contacting us about
your machine. Designations of right, left, front and rear
are used as if the operator was sitting in the mower seat.
This manual has been prepared by National Mower
Company as an aid to users for assembly, maintenance,
adjustment and ordering replacement parts. Additional
RECEIPT OF SHIPMENT
NOTE
Carefully inspect your machine and crate for dam-
age that could have occured during shipment. If damages
orshortagesarenoted,havethetransportationcompany’s
representative note this on the bill of lading.
Claims for shipping damages must be noted by the
consignee at the point of destination and filed with the
transportation company that delivers the shipment.
UNCRATING INSTRUCTIONS
In order to prevent possible damage to the machine or
personal injury, the following uncrating procedure must
be followed:
4. Lift Rear Mower (4, Fig. A) off the crate supporting
members and set aside for later attachment.
1. Position Crate 1 as shown in Figure A, on a hard, level
surface.
CAUTION
CAUTION
Handle mowers carefully with protective gloves.
Reels rotate freely and are very sharp.
2 Cut and remove all Steel Banding (2, Fig. A).
5. Make sure Wing Mowers (5, Fig. A) are secure to the
mower frame with Wing Mower Hooks (15, Fig. B).
3. Remove the entire top of the crate. Unbolt Seat (3,
Fig. A) from crate bracing and lay seat aside for
installation later. Save the bolt and washer to use for
mounting the seat mounting member.
6. Knock down all sides of crate and remove. Roll mower
backwards off of crate base.
FIGU
9
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68OMCE-10/01-350
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NATIONAL® 68" SR & DL TRIPLEX – CE
ASSEMBLY INSTRUCTIONS
REAR MOWER
WING MOWERS
1. Remove two 1/2" x 1-1/2" Hex Head Bolts (1, Fig. B)
and nuts from the shipping position in the Seat Hinge
assembly (2, Fig. B). Position Seat Hinge Assembly
with pivot facing rearward, over the seat mount of the
mower frame and fasten with Bolts (1, Fig. B) and lock
nuts.
1. Remove Wing Mower Belts (17, Fig. B) from the steer-
ing column.
2. Unlock Hooks (18, Fig. B) from Wing Mower Assem-
blies (19, Fig. B), lower them carefully to the ground.
Slip wing mower belts over Countershaft Pulleys (20,
Fig. B).
2. Pivot Seat Brace (3, Fig. B) from the axle so that the
top end aligns with the tab at the back of the seat
hinge assembly. Fasten with a 5/16" x 1" Hex Head
Bolt, Lock Washer and Hex Nut.
3. Block mower wheels to prevent mower from moving
forward. Pull Wing Mower Assemblies (19, Fig. B)
forward so that they slide on Pull Rods (21, Fig. B) and
compress springs. This will allow enough slack to
enable belts to be installed over Reel Pulleys (22, Fig. B).
3. Remove the Lifter Tee (4, Fig. B) from the shipping
position in the Pivot Tube (5, Fig. B) and set aside
cotter pin and washer for later use. Insert the rod end
of lifter tee through the slotted hole in the pad on the
rear mower frame and secure with the cotter pin and
washer as shown.
ENGINE
4. Fasten Rear Mower Pull Rod (6, Fig. B) inner leg by
removing Bolts (7, Fig. B) and reinserting it through
pull rod and attaching flanges on tractor axle. Note
that Spacers (8, Fig. B) must be in each pivot point to
allow free movement of the pull rod.
MOWER IS SHIPPED WITH DRY ENGINE. DO
NOT START ENGINE UNTIL OIL IS ADDED TO
CRANKCASE. See Engine Manual for additional
information.
5. AttachPullRod(6,Fig.B)toPivotTube(9,Fig.B)with
Pin (3, Fig. K on page 17) and Spacers (1, Fig. K).
NOTE: Before completing assembly, it will be neces-
sary to refer to the rear Mower Drive Belt Tension
section and Figure K, page 17 for adjusting belt
tension.
DIFFERENTIAL
Grease has been installed in the differential at the
factory. Refer to the Maintenance Section, page 7, for
additional information.
6. InstallRearMowerBelt(10, Fig. B)fromCountershaft
Pulley (11, Fig. B) to outer Drive Pulley (12, Fig. B).
Idler Pulley (13, Fig. B) must ride on top of lower belt
to provide proper tension. NOTE: It will be necessary
to raise rear mower to allow enough slack to get belt
over pulleys.
SEAT
1. Fasten Seat (15, Fig. B) to seat mounts by threading
four 5/16" x 1" Hex Bolts (16, Fig. B), through 5/16"
lockwashers, through holes in seat mounts and into
the threaded holes in the bottom of the seat.
11
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OPERATION
FIGURE C
The following is a description of the machine controls
and their function. Refer to Figure C.
6. Parking Brake Lever – Provides a lock for the brake.
Push brake lever forward, over center, to lock. Pulling
brake lever back, toward the rear of the machine will
disengage the brake.
1. Engine Clutch Lever (labeled Mowing Clutch) –
Engages power for travel and mowing. Down position is
disengaged and up position is engaged. IMPORTANT –
Engageslowlybeforefullengagement.Alwaysdisengage
the drive when stopping or leaving the machine. See
Caution Decal.
7. Shifter Lever – Located on the mower differential, this
control has three positions: Forward, Neutral (center
position), and Reverse. The lever must be pulled toward
thecenterofthemachinetoclearthenotchinthestopdisc
and positioned securely in the new notch.
IMPORTANT: Never shift while machine is in motion
because it could cause damage to the gears. Always
disengage engine clutch before attempting to shift.
The engine clutch lever has an electrical interlock and
engine will not start if clutch is engaged. For added safety,
the interlock system should be checked periodically to
ensure that it is adjusted to function properly.
8. Rear Mower Clutch Shifter Lever – Engages drive
to the rear mower. Pull lever forward and toward the
center of the machine to engage sliding jaw clutch. To
disengage, pull lever forward and out to engage locking
pin. Never engage the drive unless the rear mower has
been lowered to the cutting position.
2. Wing Mower Clutch – Engages drive to wing mowers.
Pull lever back and down to engage. Never engage drive
unlesswingmowershavebeenloweredtocuttingposition.
3. Ignition Key Switch – Provides a means to secure the
mower when unattended. Turn the key clockwise to
unlock the ignition.
9. Rear Mower Lifter Handle – Raises rear mower to the
transportposition. Pullhandleup, forwardandovercenter
to lock it in an up position.
4.ThrottleControl–Regulatesmowingandtravelspeeds.
Moving the control handle back or lowering it will reduce
engine speed for starting and idling engine. Push forward
toincreaseenginespeed.Neveroperatemoweratspeeds
faster than necessary to do a good, safe job.
10. Wing Mower Lifter Handles – Raises wing mower to
the transport position. Lift wing mowers until they can be
secured with hooks on frame.
5. Brake–Isdesignedtoslowthemowerandlocktherear
wheels in the full stop position. Depress the foot pedal to
engage. Note: It is best to slow the mower with the throttle
and then disengage clutch lever before applying brake.
This prevents excessive wear and engine overload.
12
Moving machinery can be dangerous if not operated
properly. Follow all safe operating suggestions listed on
Safe Operation Practices, Page 6.
68OMCE-10/01-350
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NATIONAL® 68" SR & DL TRIPLEX – CE
MAINTENANCE
LUBRICATION
grease be checked once each year. Check grease level
by loosening the bolts in the differential case flanges and
spreading case halves. It is not necessary to totally
disassemble the case or remove the wheels for this
inspection. Add Multi-purpose Gear Grease such as
Pennzoil No. 303 or equivalent if necessary. Total grease
capacity is 1-1/2 pounds.
Figure D shows the top view of the 68" Triplex Mower
with guards removed. Lubricate the machine at the
recommended locations and intervals using the proper
lubicants to ensure maximum service and long life of your
machine. Refer to the engine manual (separately
furnished) for proper lubrication and maintenance
instructions.
Since the mower does not operate at high speeds, the
grease level in the differential is not critical providing that
there is sufficient grease to coat the gears.
Do not use oil in the differential case in place
of grease–it will leak through the seals.
Unless leakage is evident, it is recommended that the
FIGURE D
LUBRICATION CHART
ITEM
GREASE
OIL
FEQUENCY
1
8 Hours
2
3
4
8 Hours
30 Hours
Yearly
Gear Grease
IMPORTANT
FigureEshowsthetopviewoftheleft
wing mower with guards removed and
shows the proper lubrication locations.
These areas on both wing mowers must
be free of dirt and grass clippings and be
well lubricated for proper drive belt ten-
sion and operation. Support collars for the
wing mower pull rods must be kept in
alignment to maintain belt tension.
FIGURE E
13
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BED KNIFE REPLACEMENT
corroded, they may have to be cut off and screws
When the bed knife becomes damaged or too worn to
keep sharp, it must be replaced. Design improvements
have made bed knife replacement easier with bolt-on
construction. Follow the procedure below.
driven out to be removed.
3. Clean the bottom surface of the backbar for
maximum metal contact with the new bed bar.
1. The backbar (1, Fig. F), bed knife (2, Fig. F) and
fasteners have been assembled at the factory under
tension. To ease replacement and prevent misalign-
ment of components, the leading edge of the backbar
must be tack welded two or three places before the old
fasteners are removed.
4. Fasten the new bed knife to the bottom of the
backbar in the position shown (bent edge up). Shoul-
der of shoulder nuts must be seated firmly in the
backbar and screws must be flush with the bottom of
the bed knife.
5. Torque shoulder nuts 35 to 40 ft/lbs.
2. Remove shoulder nuts (3, Fig. F) and flat head
screws (4, Fig. F). If shoulder nuts are badly rusted or
FIGURE F
14
68OMCE-10/01-350
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NATIONAL® 68" SR & DL TRIPLEX – CE
LAPPING PROCEDURE
INTRODUCTION
Back lapping is a very important step in maintaining sharp
reel blades on the rear and wing mowers.
3. Apply the lapping compound with the reels running,
using a 2" or a 3" brush. Apply the compound evenly to the
moving blades.
Thisprocedureshouldbeperformedwhenthereelblades
and the bed knife become slightly rounded and the grass
is not cut cleanly with only a slight bed knife adjustment.
Also, after grinding the bed knife and reels, you should
back lap to establish a perfect match between the bed
knife and reel blades.
Many types of compounds are available for lapping.
However, werecommendagoodpre-mixedwatersoluble
compound. Many different grit ranges are available. Pre-
mixedcompoundsavesthetimerequiredtomix,eliminates
the waste of abrasive, rinses off easily with water and is
available in all grit ranges from course to extra fine.
4. Stop the reel and examine both bed knife and reel
blades to see that the cutting edges are uniformly sharp.
If not, gradually tighten the reel adjuster bolts (see Figure
I, Page 16) and repeat Step 3 untill the proper sharpness
results.
RECOMMENDED STEPS
1. Adjust the bed knife to the reel so that the bed knife is
level with the reel and light contact is maintained.
2. Reels must be run in a reverse direction to be lapped.
Remove the lower drive belts and attach a back lapping
machine (not supplied by National Mower) to the reels.
Follow the instructions furnished by the machine manu-
facture.
5. Rinse off the compound thoroughly with water to
remove all abrasive. Check for sharpness and readjust
the bed knife if necessary. Reel to bed knife contact
should be adjusted to easily cut a sheet of paper (see
Adjustments, Page 16 for detailed instructions).
Be extremely careful not to let the brush, your
fingers or your clothing get caught in the reels.
Use approved safety glasses to protect your
eyes from flying particles and abrasives.
GRINDING
BACK GRIND IN THE
DIRECTION
Reels must be ground at 25° in the direction shown below
OF THE ARROW AT 25O
by the arrow in Figure G. Back grind until reel blades are
free from roundness, dents and nicks. Spin grind to
remove all burrs. All blades must be on the same diam-
eter.
For maximum cutting efficiency, grind bed knife top and
front edges at 5° as shown in Figure H.
25O
GRIND BED KNIFE
AT ANGLES SHOWN
5O
5O
Note centerline
POSITION OF
REEL
TO THE BLADE
FIGURE H
FIGURE G
15
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ADJUSTMENTS
entirewidthofthemower. Donotadjustbysight. Placethe
mower on a hard, level surface. Loosen the Adjusting
Nuts (1, Fig. I) on each side of reel assemblies and place
a board or gauge plate of the desired height under each
bed knife back bar. Tighten bolts securely.
To ensure safety, all of the following adjust-
ments must be made only after the engine
clutch lever has been disengaged and the
ignition key and spark plug wire have been
removed.
REEL TO BED KNIFE ADJUSTMENT
HEIGHT OF CUT
The reel is adjusted to a fixed position bed knife. This
construction allows a more rugged and durable frame and
retains the proper adjustment longer. The Reel Adjuster
Bolt (5, Fig. I) regulates reel distance from the bed knife.
The height of cut is variable and may be adjusted on
both wing mowers and the rear mower by loosening the
top and bottom Adjusting Nuts (1, Fig. I) which hold Roller
Adjusters (2, Fig. I) in Roller Brackets (3, Fig. I). Roller (4,
Fig. I) may then be moved up and down.
To reduce the distance, turn the upper hex adjuster nut
on each side of the reel down. Proceed slowly and do not
overadjust—use about 1/8 of a turn on each side at first.
Do not adjust one side more than the other unless the reel
is obviously out of alignment. Do not get the reel so tight
thatitishardtoturnbyhand.Atootightreelwillwearmuch
faster. Ideally, the reel should “wipe” or lightly touch the
bed knife. It is not necessary to adjust or change the
position of the lower adjustment nut.
It is important to get all rollers adjusted to the same
height so that there will be uniform cutting across the
NOTE
Guards removed or cut
away to show detail
Proper cutting action may be tested by holding paper
strips between the reel and the bed knife. Turn the reel by
hand and check to see if the assembly cuts the paper all
the way across the width of the bed knife. Make sure that
the adjusting and the locking nuts on both side are
tightened securely.
Handle reel assemblies carefully with
protective gloves.
Reels rotate freely and are very sharp.
Special care should be taken in the area
where the reel contacts the bed knife.
REEL END PLAY ADJUSTMENT
With extended use, normal wear of the reel bearings
will cause end play. This condition could cause uneven
wear to mower parts and uneven cutting of turf.
Test for end play periodically by trying to move the reel
from side to side in the frame. If there is ANY movement,
adjust the bearings by loosening the lock nut on the
adjustment bolt (6, Fig. I) which is located on the inside
right end of the reels, and turning the adjustment bolt IN
one half turn or less. Do not overtighten. An overtightened
bearing will cause excessive bearing wear. Test again for
end play and if reel is rotating freely and end play is not
noticeable, tighten the lock nut.
FIGURE I
16
68OMCE-10/01-350
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NATIONAL® 68" SR & DL TRIPLEX – CE
BRAKE ADJUSTMENT
NOTE
The foot brake is properly adjusted if it slows the
machine when depressed and can be locked when the
pedal is depressed fully.
Guards removed
to show detail
Adjust brake tension by removing cotter pin and brake
pedal pin and turning brake clevis located under pedal on
brake rod. When adjustment is complete, attach clevis to
pedal with pin and cotter pin.
WING MOWER DRIVE BELT TENSION
Proper Belt tension allows mowers to be driven without
slippage but loose enough to be deflected slightly at a
point midway between the pulleys. An overtight belt will
cause excessive bearing wear and a slipping belt causes
excessive belt wear. IMPORTANT: Never allow oil to get
on the belt which could cause slipping.
FRONT
OF
MACHINE
Adjust tension by loosening set screw (Fig. E) in the
wing mower pull arm, sliding the mower rearward and
retightening set screw.
REAR MOWER DRIVE BELT TENSION
FIGURE J
Follow the recommendations above for determining
proper tension and refer to Figure J.
for the wing mower adjustment. When tension is correct,
tighten all the bolts securely.
Spacers (1, Fig. J) are provided on the rear mower Pull
Rod (2, Fig. J) to adjust the belt tension. Remove Pin (3,
Fig. J) from the end of the pull rod and slip out the pull rod
from the Pivot Tube (4, Fig. J). Move as many spacers as
necessary to the location indicated and reassemble.
MAIN DRIVE BELT (Main Countershaft to Rear Drive)
Belt tension is increased by loosening the four bolts
holding the Main Countershaft Housing (45, Fig. 3) and
sliding the housing forward in the slotted frame holes.
NOTE - It will probably be necessary to loosen or remove
belt guards to reach the adjustment bolts. Also, if this belt
is adjusted, it will probably be necessary to readjust the
engine belt.
ENGINE DRIVE BELT (Engine to Main Countershaft)
Belt tension is increased by loosening the four engine
mounting bolts and sliding the engine forward in the
slottedframeholes.Testforthepropertensionasdetailed
17
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TROUBLE-SHOOTING
Tractor Unit
Situation
Things To Check
Engine will not start
Turn ignition switch to on
Ensure that there is sufficient gasoline (petrol) in the tank
Make sure safety switch is making contact and mowing clutch is down
Look for a loose wire on Ignition or spark plug wire not connected
Operator must be positioned on seat to depress presence switches
Interlock system inoperative—check wiring, see Figure K
Tractor will not move
forward
Gear selector must be in one of the drive positions
Engine drive clutch must be engaged (rearward and up)
Drive belts too loose (see page 17)
Visually check to see that pulleys are not slipping on shafts
If everything above is OK, check for a damaged gear in the gear box
Tractor will not move
rearward
Same as above. If all of the above check OK, check the reverse gear in the
gear box
Tractor will not stop
Ensure that the main clutch is disengaged (brake will not stop engine)
Brake adjustment or service may be needed (see page 17)
Cutting Units
Situation
Things To Check
Wing and/or rear mow-
er will not cut
Bed knife to reel position may be out of adjustment (see page 16)
Drive belts or drive chains may need tightening
Visually check that both the drive pulleys and the shafts are rotating
Cutting units will not turn.
Clutches may not be engaged
Look for anything that could be jammed between the reel and the bed knife
Drive belts or drive chains may need tightening
Visually check that both the drive pulleys and the shafts are rotating
Units will not stop turning
Uneven cut
Disengage all clutches
Height of cut not the same on each cutting unit (see page 16)
Check to see if any part is bent
Something jammed in cutting unit pivots, not allowing them to float
Electrical System (DL 68" only) Check wiring connections and switch operation—see Figure 9, page 34
All adjusting must be made with the engine off.
Do not do any investigation of the working parts of the machine with the motor running.
Always turn the engine off!
18
68OMCE-10/01-350
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NATIONAL® 68" SR & DL TRIPLEX – CE
INTERLOCK
OPERATOR PRESENCE
SWITCH N/O
07035
CONNECTOR
Yellow
INTERLOCK
TO
KEY
SWITCH
MODULE ASSY.
204988
A B C D E F
Red
GROUND
OPERATOR
PRESENCE
SWITCH N/O
07035
Yellow
Brown
NEUTRAL START
SWITCH N/O
07035
Black
Black
Yellow
ENGINE
FIGURE K
PARTS LIST
Note: For your records and future ordering, fill in the following information.
DATE PURCHASED
MODEL NO.
SERIAL NO.
ORDERING INFORMATION
When ordering replacement parts, always furnish:
1. Your complete name, address and phone number.
2. Model Number and Serial Number (stamped on the main frame
rear axle gusset below seat).
3. Part Number (it is recommended that the correct number be verified
with a current Master Price List).
4. The full Description of the part.
5. Quantity desired (quantity shown is the total number of parts con-
tained in the particular view shown).
If the Part Number and the Description of your order do not
agree, the Part Number will be used to fill your order.
19
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68OMCE-10/01-350
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NATIONAL® 68" SR & DL TRIPLEX – CE
21
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22
68OMCE-10/01-350
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NATIONAL® 68" SR & DL TRIPLEX – CE
23
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WHEN ORDERING, STATE THE MODEL AND SERIAL NUMBERS OF THE MOWER
24
68OMCE-10/01-350
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NATIONAL® 68" SR & DL TRIPLEX – CE
25
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26
68OMCE-10/01-350
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NATIONAL® 68" SR & DL TRIPLEX – CE
27
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FIGURE 5
28
68OMCE-10/01-350
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NATIONAL® 68" SR & DL TRIPLEX – CE
FIGURE 5 — WING MOWERS
Item
Part No.
Description
Qty.
1
2
201513
200235
BRACKET, Shield
UPRIGHT, Shield
4
4
2
2
2
3
4
5
_______________________2__0_3__2_5__0_________________________________________________________________________________________________________
ROLLER
203248
302847
ROLLER BRACKET, L.H.
ADJUSTER, Roller, L.H.
302846
201775
201460
ADJUSTER, Roller, R.H.
FRAME, Bed Knife, Bolt-on
SCREW, Flat Head
_________________________________________________________________________________________________________________________________2______
6
7
2
14
14
_______________________2__0_1__8_0__2_________________________________________________________________________________________________________
NUT, Bed Knife Screw
BED KNIFE, 21",
SPRING, Reel Adjusting
8
9
201504
04549
2
2
4
2
4
2
10
11
12
13
________________________2__0_0__2__3_6______________________________________________________________________________________________________________
REEL TAKE-UP ASSEMBLY
201734
06120
REEL CARRIER ASSEMBLY, Left Hand
BEARING, Reel, (Includes Race)
REEL ASSEMBLY, 6 Blade
200296
____________________________________________________________________________________________________________________________________________
14
15
201781
200256
FRAME, Wing Mower
2
2
2
2
2
2
ADJUSTING SCREW & NUT, Bearing
16
17
18
19
________________________2__0_1__4__3_7______________________________________________________________________________________________________________
TAKE-UP WASHER, Reel Bearing
CAP SCREW (Special), Pulley Scraper
PULLEY SCRAPER
201383
200287
201735
REEL CARRIER ASSEMBLY, Right Hand
_____________________________________________________________________________________________________________________________________________
20
21
03932
03601
BELT, A35, Wing Mower
PULLEY
2
2
1
1
2
22
201520
201521
203172
___________________________________________________S__H__I_E__L_D__,__R__i_g_h__t_H__a__n_d_____________________________________________________________________
SHIELD, Left Hand
23
ROLLER BRACKET, R.H.
29
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FIGURE 6
FIGURE 6 — SKIDS, REEL END SHIELDS & GUARDS
Item
Part No.
Description
Qty.
1
2
3
203728
202959
201585
SKID BAR, L.H.
SHIELD, Wing Mower
SKID, Mower
1
3
2
___________________________________________________________________________________________________________________________________________________________
4
5
6
203727
202410
202281
SKID BAR, R.H.
2
1
1
GUARD, Inside, Rear Mower
CHAIN GUARD, Rear Mower
30
68OMCE-10/01-350
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NATIONAL® 68" SR & DL TRIPLEX – CE
FIGURE 7
FIGURE 7 — DL 68" RUNNING GEAR & MISC. PARTS
Item
Part No.
Description
Qty.
1
2
3
07065
07064
07063
KEY SWITCH
AMPMETER
HOURMETER
1
1
1
________________________________________________________________________________________________________________________________________
4
5
09098
09099
DASHBOARD
1
1
1
1
1
2
GUARD, Main Belt
6
7
8
9
_____________________2__0_1__9_9__4__________________________________________________________________________________________________________
EXTENSION, Main Belt Shield
STEERING WHEEL, DL68
BRACKET, Seat Switch
201996
204987
07035
SAFETY SWITCH, Seat
_________________________________________________________________________________________________________________________________________
10
11
09101
COVER, Battery
1
1
201754
HOLDOWN, Battery
___1_2__________________________________________________________________________________________________________________________________________
201582
08057
201925
07237
07572
BATTERY BOX
ROD, Side Post Battery
FOOT REST, Left
TIRE, Deluxe Wide
INTERLOCK
1
13
14
2
1
__1__5_______________________________________________________________________________________________________________________________
2
16
1
31
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FIGURE 8
FIGURE 8 — DL 68" DRIVE PARTS
Item
Part No.
Description
Qty.
1
2
09100
201881
GUARD, Engine Clutch
RETAINER, Mowing Belt
1
1
____3____________________________________________________________________________________________________________________________________
201884
201890
201872
03603
02507
03502
06101
03902
RETAINER, Transport Belt
MOUNT, Belt Guides
STEP PULLEY, Main Countershaft
PULLEY, Transport, Main Countershaft
Washer, 10 GA.
O-RING, 7/8" Dia.
NEEDLE BEARING
BELT, Drive, B66
1
1
1
4
5
____6___________________________________________________________________________________________________________________________________
1
7
8
2
2
____9_____________________________________________________________________________________________________________________________________
2
10
11
12
1
1
3
03655
04013
PULLEY, Main Countershaft
KEY, Woodruff, #11
______________________________________________________________________________________________________________________________________________
13
201871
COUNTERSHAFT, Main
1
68OMCE-10/01-350
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NATIONAL® 68" SR & DL TRIPLEX – CE
Item
Part No.
Description
Qty.
14
15
201740
200208
HOUSING, Main Countershaft
KEY, Square, Engine
1
2
__1__6____________________________________________________________________________________________________________________________________
03926
202071
03903
BELT, Engine, Transport, 6841 Gates Power Rated
PULLEY, Engine, Transport Belt
BELT, Engine, Mowing, 6844 Gates Power Rated
1
1
1
17
18
__1__9___________________________________________________________________________________________________________________________________
03609
202780
202446
201946
200530
PULLEY, Engine, Mower Belt
BELT GUIDE WELDMENT, Engine
STUD, Belt Guide
BRACKET, Idler Pivot with Bushings
GUIDE, Belt
1
1
1
20
21
__2__2_____________________________________________________________________________________________________________________________________
1
23
24
25
1
1
1
202441
03608
SPRING, Transport Pedal Return
PULLEY, Idler
______________________________________________________________________________________________________________________________________________
26
27
201721
201728
FOOT LEVER
ARM, Idler, Lower Countershaft
1
1
___2_8__________________2__0_1__7__3_0______________________________________________________________________________________________________________
ARM., Idler, Mowing Belt
PULLEY, Clutch Lever
PULLEY LEVER, Transport
GUIDE, Belt
ROD, Transport Clutch
SPRING, Transport
PEDAL, Transport
COUNTERSHAFT, Lower
1
1
1
29
30
03607
201718
__3__1________________________________________________________________________________________________________________________________
201889
201919
202440
201966
200135
201926
1
32
33
1
1
__3__4________________________________________________________________________________________________________________________________
1
35
36
1
1
CARRIER, Lower Countershaft
33
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34
68OMCE-10/01-350
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NATIONAL® 68" SR & DL TRIPLEX – CE
35
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36
68OMCE-10/01-350
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