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DEALER SERVICE
Dealer Service
The information in this section is written for dealer service
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, do
not attempt this repair.
WARNING
• Before working underneath, disconnect driveline,
raise cutter, lock in transport position, and block
cutter securely. Hydraulic system leak down and
failure of mechanical or hydraulic system can cause
equipment to drop.
• 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 until it runs
out the side level plug.
NOTE: Repair to this gearbox is limited to replacing
bearings, seals, and gaskets. Replacing gears, shafts, and
a housing is not cost effective. Purchasing 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. Bearing failure is indicated by excessive noise
and side-to-side or end-play in gear shafts.
Seal Replacement
Recommended sealant for gearbox repair is Permatex®
Aviation 3D Form-A-Gasket or equivalent.
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.
24
Seal Installation
NOTE: Proper seal installation is important. An improperly
installed seal will leak.
1. Clean area in housing where seal outer diameter (OD)
seats. Apply a thin coat of Permatex.
2. Inspect area of shaft where seal seats. Remove any burrs
or nicks with an emery cloth.
3. Lubricate gear shaft and seal lips.
4. Place seal squarely on housing, spring-loaded lip 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.
5. Carefully press seal into housing, avoiding 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 15. Seal Installation
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