Cutting decks for CM364 / CM 374
Operators Manual
MC60RD (887738)
MC72RD (887739)
Imported by Irish Farm & Garden Machinery
1
INTRODUCTION
TO THE OWNER & OPERATOR
Congratulations on your decision to purchase a Shibaura Mower. May we recommend you read this
manual before operating your new MC60RD (887738) or MC72RD (887739) Front Mounted Mower.
Your mower has been designed to give many years of satisfactory service. Successful operation and
long life depends on proper maintenance and correct operating technique.
This Operator’s Manual has been printed to provide you with safe operating techniques, proper
maintenance procedures, correct unit assembly and parts identification on your mower. Please read
this manual carefully, following all instructions. Keep this manual handy for future reference.
All references to right and left, forward or rearward, used in this manual refer to that direction when
seated on the tractor seat facing forward.
Should any assistance be required in understanding any section of this manual, contact your
Shibaura Dealer.
IDENTIFICATION NUMBERS
Locate the serial number plate and record the numbers from it on the pictured plate below. Always
refer to this information when requesting repair parts or dealer service.
Contact your SHIBAURA Dealer for authorized service parts. Substitute repair parts will void the
product warranty and will not meet the standards required for safe operation
CE certificate will be located hear
2
TABLE OF CONTENTS
INTRODUCTION . 1
To the Owner & Operator 1
Identification Numbers 1
SAFETY PRECAUTIONS 4
The Mower 4
Mower Operation 4
The Tractor 4
Operating the Tractor & Mower 5
Servicing the Mower 5
OPERATING INSTRUCTIONS 6
General Information 6
Tips for Efficient Mowing 6
Cutting Heights 7
Gauge Wheel Adjustment 7
Rear Lift Link Adjustment 7
Uneven Terrain 8
Grass Discharge 8
Adjusting the Weight Transfer Valve 9
MAINTENANCE SECTION 10
Lubrication Schedule 10
Blade Removal & Installation 11
Blade Sharpening 11
Deck Maintenance Position 12
Service Link Position 12
Return to Operating Mode 13
Mower Deck Removal 13
Front Wheel Bearing Replacement 13
Belt Adjustment 14
Belt Replacement 14
Spindle Rebuilding 15
Reconditioning the Driveline 16
Gearbox Rebuilding 17
Driveline Shear Bolt & Snap Ring 18
3
TABLE OF CONTENTS – Continued
TROUBLESHOOTING GUIDE 19
BOLT TORQUE CHART 21
Standard Fastener Torques 21
Special Fastener Torques 21
Metric Hardware Torques 22
ASSEMBLY INSTRUCTIONS 23
Pre-Assembly Notes 23
Installing Wheel Strut Assy 24
Installing Crossmember Lift Bar 24
Installing Scalp Roller & Ears 24
Connecting Driveline & Gearbox 25
Installing Lift Arms 25
Fastening Lift Arms 26
Checking the Mower Service Links 26
Connecting Driveline to Tractor PTO 26
Assembly Notes 27
Seasonal Storage 27
SAFETY DECALS 28
SPECIFICATIONS 30
PRE-DELIVERY CHECKLIST 31
4
SAFETY PRECAUTIONS
A careful operator is the best operator. Most accidents can be avoided by observing certain safety
precautions. Read and understand these precautions before operating the Front Mounted Mower.
This equipment should be operated only by those who have been trained in its safe use.
THE MOWER
Know and understand all mower instructions and
Safety Precautions before assembly, service, or
operation. Also read and understand all Safety
Precautions in the Tractor Operators Manual.
Keep the tractor and mower in good operating
condition at all times. Always keep all shields
and guards securely in place.
Make sure all fastening hardware is properly
tightened before operating the tractor and
mower.
Keep all Safety Decals clean and free of dirt and
grime. Always replace any Safety Decals that
become damaged, lost, painted over, or
otherwise become illegible. Replace all Safety
Decals when repainting the cutter
MOWER OPERATION
DO NOT permit anyone but the operator to ride
on the tractor and mower. There is no safe place
on this equipment for passengers.
Clear the area of all visible debris before
beginning mowing operations.
Mow only during daylight hours, or when the
area is well lit artificially.
To avoid loss of control, and to prevent
overturning the tractor and mower, always mow
up and down slopes, never across. DO NOT
operate on steep slopes.
Always slow down when turning.
Always keep mower discharge directed away
from people or animals, which could be injured,
and away from objects that could be damaged
by debris thrown by the mowing blades.
To avoid the possibility of injury from flying
debris, NEVER operate the mower raised into
the transport position.
Slop and inspect all parts of the mower after
striking any foreign object. Repair any damage
before resuming mowing operations.
Disengage power to the mower and make sure
the area behind the tractor and mower is clear
before backing up.
The operator should NEVER leave the tractor
seat with the mower blades rotating, with the
tractor in motion, or when the tractor engine is
running.
Always be alert for vehicle traffic when crossing
or mowing near roadways. Avoid bystanders
when mowing on or near public facilities.
THE TRACTOR
Always use an approved Roll Over Protective
Structure (ROPS) and Seat Belt for safe
operation. Overturning a tractor, without a
ROPS, can result in serious injury or death. If
your tractor is not equipped with a ROPS and
Seat Belt, see your SHIBAURA Dealer.
ALWAYS wear the seat belt on ROPS equipped
tractors. DO NOT use a seat belt if the tractor
ROPS has been removed. NEVER allow an
open flame near the fuel tank or tractor battery.
WHEN YOU SEE THIS SYMBOL IT
MEANS:
ATTENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED!
5
SAFETY PRECAUTIONS - Continued
OPERATING THE TRACTOR & MOWER
Use the hand holds and step platforms when
mounting and dismounting the tractor to prevent
falling. Always keep steps and platforms clean
and free of mud or other debris.
The operator MUST remain in the tractor seat at
all times while mowing, transporting, or any time
the tractor engine is running.
NEVER start the engine while standing beside
the tractor. The operator MUST sit in the tractor
seat when starting the engine.
NEVER run the engine in a closed building
without adequate ventilation. Exhaust fumes are
very dangerous and can cause permanent injury
or death.
Use extreme care when operating on slopes to
maintain equipment stability.
Keep the tractor in gear when traveling downhill.
Install tractor wheel weights to increase stability
when operating on slopes. Consult your
SHIBAURA Dealer on ballasting requirements for
your equipment.
Always bring the tractor to a complete stop,
lower the mower deck to ground contact,
disengage power to the mower, set the parking
brake, shut off the engine and remove the key
before dismounting from the tractor.
NEVER park the tractor on an incline.
SERVICING THE MOWER
Keep the tractor and mower clean. Grease, dry
debris and grass buildup can cause fires,
damaging the equipment and causing serious
injury to yourself or others.
Check for and replace or repair missing, loose,
or damaged parts on the mower. A defective
mower could cause injury to another operator
who is unaware of a potential problem.
To avoid injury, do not clean, adjust, unclog, or
service the mower when the engine is running.
Do not work under the raised mower deck unless
it is tipped rearward and retained by both mower
service links, or is securely supported by a
suitable hoist, floor jack and jack stands.
Make sure all hoists, floor jacks and jack stands
are in good working order and have sufficient
capacity to support the elevated equipment
before repair, adjustment, or lubrication of the
tractor or front mounted mower.
Inspect the mowing blade retainer bolts and top
spindle nuts daily, or whenever a blade has been
removed. Blade bolt torque is 110 to 130 ft. lbs.
(1 50-177 Nm) and pulley nut torque is 80 ft. lbs.
(109 Nm) These fasteners have right hand
threads.
To avoid injury when handling mowing blades,
wear leather gloves, or wrap the blades in the
area where they will be held with heavy cloth or
other protective material.
Do not modify or alter or permit anyone else to
modify or alter the front mount mower, or any of
its components or operating functions. If in doubt
on modifications, consult your SHIBAURA Dealer
WHEN YOU SEE THIS SYMBOL IT
MEANS:
ATTENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED!
6
OPERATING INSTRUCTIONS
GENERAL INFORMATION
The safe operation of the tractor and mower is
the responsibility of the operator. The operator
MUST be familiar with tractor and mower
controls, how they work and all Safety
Precautions BEFORE starting operation. The
MC72RD (887739) Mower is designed to be
used as a finish cut lawn mower.
IMPORTANT
To avoid damage to the mower, re-torque ALL
fastening spindle pulley retaining nuts after the
first hour of mowing operation.
CAUTION: INSPECT THE MOWING
BLADE RETAINER BOLTS AND SPINDLE
NUTS DAILY, OR WHENEVER A BLADE HAS
BEEN REMOVED. BLADE BOLT TORQUE 15
110 TO 130 ft. lbs. (150-177 Nm) AND PULLEY
NUT TORQUE IS 80 ft. lbs. (109 Nm). THESE
FASTENERS HAVE RIGHT HAND THREADS.
TIPS FOR EFFICIENT MOWING
Blade sharpness affects the appearance of the
mowed lawn. A dull or damaged blade will cause
grass to appear torn or beaten off rather than cut
cleanly. Mowing blades should be checked
regularly and kept sharp to ensure the best lawn
appearance.
Tractor engine speed while mowing should be at
maximum rate RPM. This will ensure proper
blade speed for effective cutting and discharge of
grass clippings.
Travel speed greatly effects mowing
performance. The operator must use his own
best judgment for the ground speed required for
encountered mowing conditions. Always use a
lower tractor transmission speed for slower
mowing, rather than lowering engine RPM.
WARNING: DO NOT PERMIT ANYONE
BUT THEOPERATOR TO RIDE ON THE
TRACTOR OR MOWER. THERE IS NO SAFE
PLACE ON THIS EQUIPMENT FOR
PASSENGERS.
Mow often. Do not wait for the grass to get too
tall. Short grass clippings will disperse better and
deteriorate faster.
A CAUTION: CLEAR THE AREA OF
ALL VISIBLE DEBRIS BEFORE BEGINNING
MOWING OPERATIONS.
Mowing areas with tall grass or weeds may
require cutting at 4.72 inches (maximum) height
of cut. After mowing once, re-cut the entire area
with the mower reset to the desired final height of
cut.
When cutting along sidewalks, driveways, etc., it
is advisable to mow with the discharge directed
away from these areas for 2 or 3 passes. This
will keep grass clippings off of these areas.
WARNING:
ALWAYS KEEP MOWER DISCHARGE
DIRECTED AWAY FROM PEOPLE OR
ANIMALS WHICH COULD BE INJURED
AND AWAY FROM OBJECTS THAT COULD BE
DAMAGED BY DEBRIS THROWN BY THE
MOWER BLADES.
The gauge wheels on either side of the front of
the mowing deck serve as convenient mowing
guides. When mowing, position the mower so the
gauge wheel overlaps the edge of the strip
previously cut. This will assure full mowing
coverage.
CAUTION: MOW ONLY DURING
DAYLIGHT HOURS OR WHEN THE AREA IS
WELL LIT ARTIFICIALLY.
WARNING: TO AVOID THE
POSSIBILITY OF INJURY FROM FLYING
DEBRIS, NEVER OPERATE THE MOWER IN
THE RAISED TRANSPORT POSITION.
When transporting, always disengage the power
to the mower.
7
CUTTING HEIGHTS
This mower can be adjusted to mow from 1.18
inches to 4.72 inches (30 to 120 mm) height of
cut. Grass mowing height should be determined
by encountered conditions and personal
preference.
The following recommendations are provided as
a guide for cutting height selection.
Lawns = 1.18 to 3” (30-76mm)
Field Cutting = 3” to 4.72” (76-120 mm)
To change the height of cut it is necessary to
adjust the gauge wheels and the rear lift rods
with the unit parked on a driveway, garage floor
or similar flat and level surface.
GAUGE WHEEL ADJUSTMENT
1. Start the tractor engine and raise the mower
by pulling rearward on the hydraulic control lever.
2. Shut off the engine, remove the key and set
the tractor parking brake.
3. After determining the desired cutting height, as
shown on the chart above (duplicated as a label)
on the mower deck), remove the lock pin from
one of the front wheel spindles. Lower spindle
shaft until C-Spacers (1) can be slid over the
relief area of spindle shaft. Install the number of
C-Spacers needed to acquire desired cutting
height. Slide shaft up and install remainder of C-
Spacers, washer and lock pin to top of shaft.
Repeat the adjustment on second gauge wheel.
4. To adjust rear gauge wheels, use the chart
shown across or label on the mower deck to
determine desired cutting height. Remove wire
ring and clevis pin (2) from one of the gauge
wheels. Place the spindle shaft in line with the
appropriate cross hole, reinstall the clevis pin
and wire ring. Repeat the adjustment on the
second rear gauge wheel.
8
OPERATING INSTRUCTIONS - Continued
REAR LIFT LINK ADJUSTMENT
1, Lower the mower by pushing the hydraulic
control lever forward with the engine shut off.
2. Select the correct clevis pin position for the
height of cut desired and pin the link rod.
3. Loosen the jam nut (1) on the rod and block.
Using a pin, or similar tool, punch through one of
the holes in the rod, adjust the link rod so the
rear gauge wheels are 118 off the ground.
Tighten the jam nut against the block.
UNEVEN TERRAIN
Pre-plan mowing over uneven terrain so the
grass will be dry, minimizing wheel slippage and
spinning which will damage the turf.
WARNING: TO AVOID LOSS OF
CONTROL, AND TO PREVENT
OVERTURNING THE TRACTOR AND MOWER,
ALWAYS MOW UP AND DOWN SLOPES,
NEVER ACROSS. DO NOT OPERATE ON
STEEP SLOPES.
Pass diagonally through sharp dips. Avoid sharp
drop-offs completely to prevent “hanging-up” the
tractor and mower.
WARNING: INSTALL TRACTOR WHEEL
WEIGHTS TO INCREASE STABILITY WHEN
OPERATING ON SLOPES. CONSULT YOUR
SHIBAURA DEALER ON BALLAST/NC
REQUIREMENTS FOR YOUR EQUIPMENT
CAUTION: KEEP THE TRACTOR IN
GEAR WHEN TRAVELING DOWNHILL.
Before mowing, check the area to determine the
best procedure. Consider the grass type and
height and the type of uneven terrain on which
the mowing is to take place.
DANGER: ALWAYS USE AN
APPROVED ROLL OVER PROTECTIVE
STRUCTURE (ROPS) AND SEAT BELT FOR
SAFE OPERATION. OVERTURNING A
TRACTOR WITHOUT A ROPS CAN RESULT IN
SERIOUS INJURY OR DEATH. IF YOUR
TRACTOR IS NOT EQUIPPED WITH A ROPS
AND SEAT BELT SEE YOUR SHIBAURA
DEALER.
WARNING: ALWAYS WEAR THE SEAT
BELT ON ROPS EQUIPPED TRACTORS. DO
NOT USE A SEAT BELT IF THE TRACTOR
ROPS HAS BEEN REMOVED.
Avoid sudden starts and stops while traveling up
or down hill and slow the ground speed while
turning.
GRASS DISCHARGE
This mower deck has been designed to provide
maximum air flow for an even discharge of grass
clippings. When mowing tall or lush grasses,
select a lower tractor transmission speed or
reduce the width of cut for the best discharge
efficiency.
9
WARNING: NEVER OPERATE THE MOWER WITH THE DISCHARGE DEFLECTOR IN THE
RAISED POSIT/ON.
For the best lawn appearance, do not mow when the grass is wet or heavy with dew. Wet grass could
plug the discharge area of the mower creating an unnatural load through the blades and spindles
possibly damaging the mower deck belt. Wet grass will also leave unsightly dumps on the lawn.
If the mower should become clogged, back the unit out of the uncut grass. If the mower will not clear
itself, raise the deck to the maintenance position (see page 12 for procedure), shut off the engine, set
the parking brake and clean the bottom of the deck with a scraper.
WARNING: THE OPERATOR SHOULD NEVER LEAVE THE TRACTOR SEAT WITH THE
MOWER BLADES ROTATING, WITH THE TRACTOR IN MOTION OR WHEN THE TRACTOR
ENGINE IS RUNNING.
In medium and heavy cutting conditions, mow so the discharged clippings will be AWAY from uncut
grass. In light cutting, discharged clippings can be directed onto the uncut grass allowing them to be
recut finer, leaving the lawn almost free of unsightly clippings.
ADJUSTING THE WEIGHT TRANSFER VALVE
The Weight Transfer Valve is used to transfer the mower weight to the tractor to reduce the possibility
of turf gouging and scalping.
Adjustment of the weight transfer valve should be accomplished as follows:
1. With the tractor engine running at rated
RPM, push the hydraulic control forward into
the float position.
2. Turn the Weight Transfer Valve knob (1)
clockwise until the mower lifts off of the ground.
3. Turn the knob (1) counterclockwise slowly
until the mower front gauge wheels touch the
ground. Turn the knob (1) another 1/4 turn
counterclockwise.
4. Operate the mower on uneven terrain at a
desired ground travel speed and observe the
front gauge wheels. The Gauge wheels should
be following the contour of the ground.
If not,
5. Turn the knob (1) counterclockwise 1/4 turn
at a time until the gauge wheels follow the
grounds contour.
10
MAINTENANCE SECTION
SCHEDULE
Lubrication
Before operating the MC60RD (887738) or
MC72RD (887739) mower, make sure it has
been properly lubricated according to the
illustrated chart below.
Always wipe the fitting to be lubricated with a
clean cloth before using a grease gun. Dirt
injected thru the fitting will damage closely
machined parts.
Use an SAE multipurpose lithium base grease on
all lube locations shown. Do not let excess
grease buildup on or around parts, especially
when the mower is used in sandy areas.
Gearbox Oil
The Gearbox oil level should be even with the
bottom edge of the filler plug hole. Make sure the
cutter is level and fill with the following grease or
oil.
NH #9821006 grease, or any “pour” consistency
EP grease.
Tire Pressures
Front Tractor Tires 10 psi (0.7 kg/cm)
Rear Tractor Tires 12 psi (0.8 kg/cm)
Front Gauge Wheel Tires 14 psi (1.0 kg/cm)
11
MAINTENANCE SECTION - Continued
BLADE REMOVAL & INSTALLATION
WARNING:
DO NOT WORK UNDER THE RAISED
MOWER DECK UNLESS IT IS TIPPED
REARWARD AND RETAINED BY BOTH
MOWER SERVICE LINKS, OR IS
SECURELY SUPPORTED BY A SUITABLE
HOIST FLOOR JACK AND JACKSTANDS.
Remove mower blades for sharpening and/or
replacement as follows. Raise the mower deck to
the maintenance position. See instructions on
page 12.
SERVICE NOTE:
Use a spanner wrench, PIN FNH24RT96, in the
spindle pulley holes to hold the spindle shaft
while loosening or torquing blade and spindle
pulley fasteners.
When installing the blade components, make
sure the blade is installed with the curved edge
“sail” toward the deck bottom.
• Using the spanner wrench, torque the blade
bolts to 110-130 ft. lbs. (150-177 Nm). Spindle
pulley nut torque is 80 ft. lbs. (109 Nm)
IMPORTANT:
Check and re-torque the blade and spindle pulley
fasteners after the 1st hour of mower operation,
and daily thereafter.
BLADE SHARPENING
Inspect the blades before each use to be sure
they are properly installed and are in good
condition. Replace any blade that is bent,
excessively nicked or worn, or shows signs of
other damage. Use only genuine SHIBAURA
blades on this mower.
WARNING: TO AVOID INJURY WHEN
HANDLING BLADES, WEAR LEATHER
GLOVES, OR WRAP THE BLADES IN THE
AREA WHERE THEY WILL BE HELD WITH
HEAVY CLOTH OR OTHER PROTECTIVE
MATERIAL.
IMPORTANT:
When sharpening blades, remove the same
amount of material from each blade to maintain
balance. Unbalanced blades will cause
excessive vibration which could damage gearbox
and mower components.
Sharpen the blades following the original pattern
illustrated above. If using a grinder or cutting
disc, use care so the cutting edge does not get
too hot from friction causing it to lose its heat
treat. Do not sharpen to a razor edge! Leave a
1/32 inch edge as shown.
Check the blade for balance by placing a
horizontal rod through the blade center hole. The
heavy side of the blade will drop down. Sharpen
on the heavy side until the blade remains
balanced on the rod.
12
MAINTENANCE SECTION - Continued
DECK MAINTENANCE POSITION
Place the tractor and mower on a firm and level
surface.
1. Stop engine and make sure parking brake is
set BEFORE dismounting the tractor.
2. It is necessary to disconnect driveline from
tractor PTO shaft.
3. Move rear gauge wheels to the highest
position.
4. Remove the 518 clevis pin (1) from the rear lift
rods. It is not necessary to remove the rear lift
rods.
5. On MC60RD (887738) or MC72RD (887739)
mowers only, move ear extension to flip up hole.
(See the figure to the right) DO NOT mow with
ear extension in this position.
6. Start the tractor engine and raise the mower to
the fully raised position. Stop the engine and
make sure the parking brake is set BEFORE
dismounting the tractor.
7. While pushing the mower deck forward with
the foot and pulling by hand (as shown in figure
to the right) lower the mower by placing the lift
control in the float position.
8. Reverse the procedure to put mower in
mowing position.
SERVICE LINK POSITION
The service links (2) attach to the rod on the top
of the lift arms. They are used to hold the deck
off the ground for minor maintenance when the
full flip up position is not required.
NOTE:
It is not necessary to disconnect the mower
driveline from the tractor RIO shaft.
1. Start the engine and raise the mower deck all
the way up.
2. Shut off the engine and connect both service
links to the pins on the lift arms.
WARNING: NEVER START THE ENGINE
WHILE STANDING BESIDE THE TRACTOR.
THE OPERATOR MUST SIT ON THE SEAT
WHEN STARTING THE ENGINE
13
MAINTENANCE SECTION - Continued
RETURN TO THE OPERATING MODE
1. Start the engine and raise the tractor lift
system to the full up position. Shut off the engine
and dismount the tractor.
2. Pull rearward and up on the lower part of the
deck and reconnect the clevis pins and hairpin
clips through the tumbuckles on the rear lift rods.
or
Disconnect the service links from the lift arms
and swing them up against the tractor step
platform for storage.
3. SLOWLY lower the mower to the ground with
the lift control lever.
4. Align the blind splines on the driveline shaft
halves and slide it together.
IMPORTANT.
There is a blind spline between the rear and front
half of the driveline. Align the two pinched male
splines on the mower half of the driveline with
the open female spline in the tractor half and
slide together. The female open spline is 1800
around the shaft from the grease fitting.
5. Install the driveline to the tractor PTO shaft by
pulling back on the lock collar as it is installed.
Release the lock collar and pull on the shaft to
make sure it is locked to the tractor PTO shaft.
IMPORTANT
Make sure the snap ring is installed on the gear
box input shaft (see page 22) and the sliding lock
collar is securely locked to the tractor PTO shaft
before attempting to operate the mower deck.
MOWER DECK REMOVAL
1. Make sure the tractor is on a firm level
surface, the engine is shut off, the parking brake
is set, and the lift control lever is in the ‘float”
position before proceeding.
2. Disconnect the driveline from the tractor PTO
by pulling back on the coupler collar, unlocking it
from the tractor PTO shaft.
3. Using a length of baling wire, fasten the
driveline halves together at the yokes.
4. Pull the hairpin clips and clevis pins through
the turnbuckles on the rear lift rods. It is not
necessary to remove the rear lift rods from the lift
arms.
5. Pull the hairpin clips and remove both clevis
pins retaining the lift arms to the front of the
deck.
6. Raise the lift arms and roll the mower deck
away from the tractor.
7. If the mower deck is being removed for
seasonal storage, also remove the special pins
holding the arms to the tractor. Remove both lift
arms and place them with the mower.
NOTE:
Mower deck reinstallation is a reversal of steps 2
through 7 above.
FRONT WHEEL BEARING REPLACEMENT
When replacing the front wheel bearings it will be
necessary to identify which bearings fit your
wheel. Measure the bearings. If the bearings
measure .950 inches then it is necessary to use
bearing kit number AUBl63491. If the bearing
measures 1.950 inches, then it is necessary to
use bearing kit number AUBl63555.
You can also identify the bearing kit by the end
caps. If the end cap is stamped, then use kit
number AUB163491. If the end cap is powdered
metal use AUBI 63555.
14
MAINTENANCE SECTION - Continued
BELT ADJUSTMENT
The deck belt is located under two shields on the
top of the mower deck. Check and adjust the belt
tension after the first 8 hours of mower operation
and weekly thereafter.
1. Make sure the tractor is on a firm level
surface, the engine is shut off, the parking brake
is set and the lift control lever is in the “float”
position before proceeding.
NOTE:
It is not necessary to remove the mower from the
tractor for belt work.
2. Pull the hairpin clips and remove both clevis
pins retaining the lift arms to the front of the
deck. Raise the lift arms from the mower deck.
3. Remove both deck shields and clean all debris
off of the deck, away from the belt and gearbox.
Make sure the idler arm and pulleys rotate freely.
4. Loosen the lock nut on the threaded spring
adjustment rod. Adjust the spring to 5-9/16
inches (142 mm overall length between the hook
ends. Tighten the lock nut.
5. Reinstall both deck shields, lower the lift arms
into their brackets on the mower deck and
reinstall the C pins and hairpin dips.
BELT REPLACEMENT
IMPORTANT
The mower deck belt should be replaced every
200 hours of mower operation or any time the
belt shows evidence of wear, cracking or other
damage.
NOTE:
The mower deck MUST be removed from the
tractor according to instructions on page 13 for
belt replacement.
1. Remove both deck shields and clean all debris
off of the deck.
2. Loosen and release the belt spring tension
rod.
3. Loosen both gearbox bracket mount bolts
through the rear (shaft end) of the bracket and
remove both bolts from the front of the bracket.
4. CAREFULLY roll the belt off the idler pulley
and disconnect the belt from all other pulleys.
5. Raise the front of the gearbox and bracket and
pull the old belt through the opening between the
bracket and deck top.
6. Install the new belt, reversing steps route as
illustrated below and adjust to adjustment steps
on this page.
7. Reinstall the mower to the tractor.
Route Belt As Shown
IMPORTANT
Whenever a new belt is installed, it should be
checked and readjusted after the first hour or of
operation.
15
MAINTENANCE SECTION - Continued
SPINDLE REBUILDING
Reconditioning procedures for all three spindles
are the same. Make sure the deck, especially the
bottom around the spindle, is well cleaned of
grass buildup before spindle removal. The
spindle to be rebuilt must be removed from the
deck.
SPINDLE REMOVAL
NOTE:
The mower deck MUST be removed from the
tractor according to instructions on page 13 for
spindle rebuilding.
1. Disconnect the deck belt and remove the
blade bolt and blade and pulley nut and spindle
pulley.
2. Remove all four 7/16-20 locknuts from the
spindle housing studs on the top of the deck.
Remove the spindle from the bottom of the deck.
SPINDLE DISASSEMBLY
1. Disassemble the complete spindle and wash
all parts in clean solvent. Inspect and replace
any part that is excessively worn or damaged,
especially the roller bearing cups and cones.
IMPORTANT
Any time a spindle is disassembled and the shaft
is removed, both seals and their seal spacers
MUST be replaced.
2. Inspect the bearing spacer from the center of
the spindle housing. This spacer is designed to
maintain correct bearing pre-load. Its length
should be .606 ± .001. If this spacer is not within
this tolerance, it must be replaced.
SPINDLE REASSEMBLY
Make certain all spindle parts are clean before
reassembly. All internal parts should be coated
with a coat of clean grease, especially the roller
bearings, for ease of reassembly.
Spindle Cutaway
1. Use an arbor press to install the bearing cups
into the housing. Make certain the cups are fully
seated. Place one roller bearing into the cup in
the lower housing.
IMPORTANT
The lower seal is different than the upper seal. It
can be identified by the backup spring behind the
seal lip. This seal should NOT be used as an
upper seal.
2. Press the lower seal into its bore, seal lip
inward, until it bottoms in the housing. Install the
seal spacer into the seal. Insert the spindle shaft
through the lower seal and spacer until it is fully
in place.
3 Turn this assembly right side up, holding the
shaft so it does not fall out. Slide the bearing
spacer over the shaft into the housing cavity.
Install the upper roller bearing cone and the seal
spacer on the shaft against the bearing.
4. Install the upper seal (no seal lip backup
spring) over the shaft and press into place, flush
with the housing top. The upper seal up points
up (away from the bearing).
16
MAINTENANCE SECTION - Continued
SPINDLE ASSEMBLY - Continued
5. Tap the square key into place in the upper
shaft. Wrap masking or electrical tape around the
shaft and key. This will keep the key in place and
will prevent the shaft from slipping out of the
housing during reassembly to the mower deck.
6. Reinstall the lube filling in the top of the shaft.
SPINDLE REINSTALLATION
1. Place the spindle into the deck from the
bottom and retain with 7/16 fine thread locknuts.
Torque all four nuts to 35-45 ft. lbs. (48-61 Nm).
2. Remove the tape from the spindle shaft and,
while holding the shaft from the bottom, install
the belt pulley, 3/4 flat washer and 3/4-16
locknut.
3. Install the spindle washer, mowing blade,
blade spacer and 9116-12 x 1-3/4 Grade 8 bolt.
See parts page 28 for item illustrations.
4. Torque the blade bolt, using a spanner wrench
through the holes in the pulley, to 110-130 ft. lbs.
(150-1 77 N Torque the pulley nut to 80 ft. lbs.
(109 N-m). Re-torque these fasteners after one
hour of mower operation and daily thereafter.
5. Lubricate the spindle with a high quality
multipurpose grease until the grease begins to
vent from around the UPPER seal.
IMPORTANT.
The rebuilt spindle should be greased again after
15 minutes of operation to ensure that air
pockets in the spindle housing have been fully
purged
6. Reinstall the mower deck to the tractor
RECONDITIONING THE DRIVELINE
DRIVELINE DISASSEMBLY
1. Disconnect the rear half of the driveline from
the tractor PTO shaft, slide it out of the front half
and lay it aside.
2. Loosen the two bolts that retain the driveline
shield to the mower gearbox and pivot it upward
out of the way.
3. Remove the fastener through the driveline
yoke, remove the snap ring from the gearbox
input shaft, and remove the front half of the
driveline from the mower.
Driveline - Exploded View
4. Clamp the front half yoke securely in a belt
vise with jaws that are lined with wood board
brass or copper faces, etc. Remove the exterior
snap ring from inside the lock collar. Slide
collar and spring off of the yoke. THE BALLS
WILL FALL OUT! Use care so they a not lost.
5. Tear down the remaining driveline as
necessary. Lay the U-joints aside and wash all
other parts with clean solvent. Inspect and
replace the U-joint or any other item that is badly
worn or damaged
17
MAINTENANCE SECTION - Continued
DRIVELINE REASSEMBLY
Use care when installing the U-joint bearing cups
so the needle bearings remain in place. It is
advisable to smear a light coating of heavy
grease into the cups to help retain the needle
bearings. If the cup set, on either side of the
cross, will not go in enough for the snap rings to
be installed, it usually indicates one or more
needles fell and are in the bottom of the cup
restricting installation.
NOTE:
The blind splines will have to be aligned as
follows as the shaft is put back together.
IMPORTANT
There is a blind spline between the rear and front
half of the driveline. Align the two pinched male
splines on the mower, half of the driveline with
the open female spline in the tractor half and
slide together. The female open spline is 1800
around the shaft from the grease fitting.
Use an SAE multipurpose lithium base grease
and lubricate all three fittings on the driveline
before reinstallation.
Reassembly and reinstallation on the mower is a
reverse order of disassembly instructions.
GEARBOX REBUILDING
NOTE:
This gearbox is not adjustable. If backlash or
rolling torque is considered excessive, the
gearbox should be rebuilt or replaced.
GEARBOX DISASSEMBLY
Prepare the mower for gearbox removal by
following all instructions under Belt Replacement
on page 14.
1. Remove all four bolts retaining the gearbox
bracket to the top of the deck and remove the
gearbox bracket assembly.
2. Remove the brackets and shield from the
gearbox, remove both pipe plugs, lay the box on
one side and drain all old oil.
3. Remove all 9 socket head bolts securing the
gearbox halves together. Tap the seam with a
soft wood or plastic hammer to break the seal
and split the box halves.
4. Disassemble the gearbox, remove sealer from
both case halves, wash parts in a clean solvent
and inspect for signs of wear or damage.
GEARBOX REASSEMBLY
1. Replace needed parts, always using NEW
SEALS.
Gearbox . Exploded View
2. Apply a 1/16 inch (1.6 mm) bead of liquid
gasket material (Locktite® 504 or 515 or
equivalent) to the flat surface of the bottom case
half only.
IMPORTANT
DO NOT allow liquid gasket material to get into
the seal recesses in the housing.
18
MAINTENANCE SECTION - Continued
GEARBOX REASSEMBLY - Continued
3. Place the case halves together, insert and torque the socket head bolts to 15-20 ft. lbs. (20-2
Lightly tap the shaft ends with a soft hammer to seat the bearings.
4. Position the gearbox in an upright position, as it will be on the mower, and fill it with grease shown
on the lube schedule on page 10.
5. Position the belt pulley and collect hub (flush with the bottom of the output shaft) and alternate the
1/4 hub bolts until 7-9 ft. lbs. (9-12 Nm) of torque is reached.
6. Reinstall the gearbox brackets and driveline shield to the gearbox and reinstall the gearbox
assembly to the mower deck.
Reassembly and reinstallation on the mower is a reverse order of disassembly instructions.
DRIVELINE SHEAR BOLT & SNAP RING
The driveline between the tractor and mower
gearbox is protected by a 3/8-16 x 2 Hex Skt.
Head GRADE 5 shear bolt (1). Do not use a
Grade 2 bolt as it may shear too frequently. Also
do not use a Grade B bolt as it may not shear
when necessary causing damage to the gearbox
or tractor PTO. Any time a shear bolt
breaks, the snap ring (2) located on the gearbox
input shaft, should be checked, if is it is not
properly located, appears damaged, or is
completely missing, it MUST BE REPLACED.
Align the shear bolt hole in the yoke, with the
cross hole in the input shaft, and install a new
shear bolt and locknut. The locknut should be
snug against the yoke, tight enough to allow the
bolt to turn easily with a slight twist with a
wrench.
SPECIAL SHEAR BOLT, PART #AU8968020
lMPORTANT.
Make sure the snap ring is in place as a missing snap ring will allow the shaft to come off when the
shear bolt breaks, severely damaging mower and tractor
19
TROUBLESHOOTING GUIDE
The following troubleshooting guide is for the mower and its drive. This assumes the tractor engine is
running to prescribed specifications and the tractor hydraulics are working properly. Consult the
Tractor Repair Manual for all tractor system checks.
Before attempting repair or test, observe the general condition of the tractor and mower. Make certain
the tractor is operating properly and the mower is setup correctly. The following information may give
you some hints in what to look for when attempting to solve a problem with the mower. If the problem
cannot be easily solved, contact your SHIBAURA Dealer.
SYMPTOM PROBLEM CORRECTION
Excessive Vibration. Loose gearbox bolts. Re-torque or replace as necessary.
Loose spindle/blade fasteners. Re-torque or replace as necessary.
Damaged gearbox. Rebuild gearbox as necessary.
Worn or damaged driveline or
universal joints. Rebuild driveline as necessary.
Blade interference with grass
buildup in deck. Clean the underside of the deck.
Blades out of balance, Balance blades according to
instructions found on page 11.
Blade(s) broken or worn badly. Replace mowing blades in sets of 3.
Low on lubricant. Fill to oil level plug.
Gearbox Overheating. Debris buildup on top of mower
deck around gearbox. Clean deck top and remove debris.
Gearbox Noisy. Worn or rough bearings. Replace bearings.
Worn or rough gears. Run-in gears or replace bearings.
Gearbox Leaking. Damaged oil seal. Replace oil seals.
Damaged shaft in seal area. Replace shaft and oil seals.
Oil seal installed wrong. Replace oil seals.
Oil level too full. Drain oil to correct level.
Cracked or broken housings. Replace the housings or complete
gearbox assembly.
Gasket damaged. Replace liquid gasket (page 17).
Bolts loose. Re-torque bolts (page 21).
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