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The information in this section is written for dealer ser-
vice personnel. The repair described here requires
special skills and tools. If your shop is not properly
equipped or your mechanics are not properly trained in
this type of repair, you may be time and money ahead
to replace complete assemblies.
WARNING
WARNING
■
Before
working
underneath,
instructions, securely block up, and check stability.
Secure blocking prevents equipment from drop-
ping due to hydraulic leak down, hydraulic system
failure, or mechanical component failure.
Keep all persons away from operator control
area while performing adjustments, service, or
maintenance.
CAUTION
Always wear relatively tight and belted clothing
to avoid getting caught in moving parts. Wear
sturdy, rough-soled work shoes and protective
equipment for eyes, hair, hands, hearing, and head;
and respirator or filter mask where appropriate.
GEARBOX MAINTENANCE
NOTE: Read this entire section before starting any
repair. Many steps are dependent on each other.
1. Fill gearbox with SAE 80W or 90W gear lube.
Proper oil level is between lowest ring and end of
dipstick.
NOTE: Repair to this gearbox is limited to replac-
ing bearings, seals, and gaskets. Replacing gears,
shafts, and a housing is not cost effective. Pur-
chasing a complete gearbox is more economical.
2. Inspect gearbox for leakage and bad bearings.
Leakage is a very serious problem and must be
corrected immediately.
NOTE: Bearing failure is indicated by excessive
noise and side-to-side or end-play in gear shafts.
28 Dealer Service
DEALER SERVICE
Seal Replacement
Recommended
Permatex
Leakage can occur at the vertical or horizontal gaskets
and shaft seals.
Leakage at the horizontal gasket or seal can be
repaired without removing the gearbox from the cutter.
Seal Installation
read
manual
NOTE: Proper seal installation is important. An improp-
erly installed seal will leak.
1. Clean area in housing where seal outer diameter
2. Inspect area of shaft where seal seats. Remove
3. Lubricate gear shaft and seal lips.
4. Place seal squarely on housing, spring-loaded lip
5. Carefully press seal into housing, avoiding
(Figure 12)
sealant
®
Aviation 3D Form-A-Gasket or equivalent.
(OD) seats. Apply a thin coat of Permatex.
any burrs or nicks with an emery cloth.
toward housing. Select a piece of pipe or tubing
with an OD that will sit on the outside edge of the
seal but will clear the housing. Tubing with an OD
that is too small will bow seal cage and ruin seal.
distortion to the metal seal cage.
1. Seal
2. Pipe or tube
3. Seal seat
4. Casting
Pipe or tube must
press at outer
edge of seal.
Incorrect
Installation
Figure 12. Seal Installation
for
gearbox
repair
is
MAN1282 (3/09/2020)
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