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Dealer Service 25
MAN0137 (9/14/01)
DEALER SERVICE Cont’d
Remove Gearbox
1. Disconnect drive shaft and remove key from key-
way.
2. Remove belt and remove gear stand from mower.
3. Turn gear stand over. There are two set screws in
the split taper bushing; remove them. Insert one set
screw into the threaded bushing hole and tighten to
force bushing and pulley apart.
4. Remove gearbox from stand.
Repair Gearbox Leak
Permatex
®a
sealant is used on the outer diameter of
the seals. Substitute seals may not meet original
equipment specifications and could cause leakage.
1. Clean gearbox exterior to remove all foreign
material. When opening, use care to prevent foreign
material from entering gearbox.
2. To repair horizontal seal, vertical shaft, or leakage
between cover and gearbox, remove vent plug and
drain gear lube from box.
3. Remove leaking seal and replace (refer to Install
Seal, page 25). Use care to prevent rolling the seal lip
under.
4. Replace gasket between cover and gearbox.
a. Permatex is a registered trademark of the Permatex Corporation.
Figure 19 Gearbox Repair
Install Seal
Proper seal installation is important. An improperly
installed seal will leak and could result in bearing fail-
ure.
1. Clean areas in housing where seal outer diameter
seats. Inspect gear shafts. Pay specific attention to
areas where seals seat. Check for cracks, grooves,
nicks or bumps. Replace housing or shaft if damage
cannot be repaired by resurfacing with emery cloth.
2. Lubricate seal lip and carefully guide over shaft
using a blunt tool such as a letter opener. Be careful
not to roll seal lip under. Do not use a knife as it will
nick and ruin seal.
3. Place seal squarely on housing (spring-loaded lip
toward inside of gearbox). Select a seal driver, a
piece of pipe or tubing with an OD that will set on out-
side edge of seal but will clear housing. A driver that
is too small will bow seal cage and ruin seal.
4. Carefully press seal into housing, preventing dis-
tortion to metal seal cage. Seat vertical seal flush with
housing and horizontal seal against shoulder in hous-
ing.
Distortion to seal case or damage to seal lip will
cause seal to leak. Remove and replace seals dam-
aged in installation.
5. Check for proper vent plug operation and fill gear-
box with 8 oz. of SAE 90W gear lube.
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DB3449A
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