Engine
7-24
31211015 6036, 6042, 8042, 10042, 10054
7.10 ISOLATION COUPLER
7.10.1 Isolation Coupler Removal
1. Park the machine on a firm, level surface, level the
machine, fully retract the boom, lower the boom, place
the transmission in (N) NEUTRAL, engage the park brake,
and shut the engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and steering wheel, stating that the machine
should not be operated.
3. Open the engine cover. Allow the system fluids to cool.
4. Properly disconnect the battery. Refer Section 9.8,
“Battery”, for procedure.
Note: Rotating the fan belt by hand gives greater access to
removing the drive shaft mounting cap screws.
5. Remove the cap screws and straps that secure the drive
shaft to the transmission yoke.
6. Remove the cap screws and lock washers securing the
drive shaft to the coupling flange.
Note: It may be necessary to loosen/remove the motor mounts
on either side of the engine to gain access to the bottom cap
screws on the outer half of the coupler. Place a jack under the
bell housing (use a wood block to support the engine) and
carefully lift the engine until the bottom edge of the bell
housing is at the top edge of the frame member that mounts
the rear axle to the frame. Watch the fan-to-radiator clearance
as your are lifting the engine. If necessary, turn the fan slightly
by hand to gain additional clearance.
7. Remove the cap screws and lock washers securing the
access cover plate (3).
8. Remove the cap screws securing the coupler (4) to the
flywheel.
Note: The coupler is heavy and requires two people, one on
each side, to remove.
9. Remove the coupler assembly.
10. At this time, use a suitable cleaner/solvent and
thoroughly clean the mounting lip of the flywheel. Wipe
any debris from the inside of the bell housing. Use the
cleaner to clean the threaded holes around the flange of
the bell housing.
7.10.2 Isolation Coupler Installation
1. Use cleaner to clean the backside of the coupler, where
it comes in contact with the flywheel.
Note: Refer to Section 2.7, “Thread Locking Compound” for all
thread locking requirements.
Note: The new coupler is heavy and requires two people, one
on each side, to install.
2. Place the new coupler into the indentation of the
flywheel and use new hardware to secure the coupler to
the flywheel. DO NOT fully tighten until all cap screws
are in place.
3. After all cap screws are in place, check to be sure the
coupler is resting squarely in the indentation of the
flywheel. Torque all the cap screws to 37 lb-ft (48 Nm).
Note: Before assembling the drive shaft to the coupling; be
sure the access cover plate is placed on the engine-side of the
frame member that mounts the rear axle to the frame.
4. Install the access cover plate over the drive shaft and
assemble the drive shaft flange to the coupler using
new hardware. Torque to 48 lb-ft (65 Nm).
5. If engine mounts were previously removed or loosened,
carefully lower the engine down onto the front engine
mounts. Reassemble the rebound washer and secure in
place with a new locknut. Torque to 60 lb-ft (81 Nm).
Repeat this procedure for the engine mount on the
other side.
6. Thoroughly clean the transmission yoke and secure in
place with new straps and hardware. Torque to
55 – 60 lb-ft (75 – 81 Nm).
7. After the drive shaft is in place, grease both u-joints and
the slip joint using multi-purpose grease.
8. Properly connect the battery. Refer Section 9.8,
“Battery”, for procedure.
9. Close and secure the engine cover.
10. Remove the Do Not Operate Tags from both the ignition
key switch and the steering wheel.
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