Dealer Service
25
MAN1339
(05/17/22)
DEALER SERVICE
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.
■ Before working underneath, read manual
instructions, securely block up, and check sta-
bility. Secure blocking prevents equipment from
dropping due to hydraulic leak down, hydrau-
lic system failure, or mechanical component
failure.
■ Keep all persons away from operator control
area while performing adjustments, service, or
maintenance.
■ Always wear relatively tight and belted clothing
to avoid getting caught in moving parts. Wear
sturdy, rough-soled work shoes and protec-
tive 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 re-
pair. 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 re-
placing bearings, seals, and gaskets. Replacing
gears, shafts, and a housing is not cost effec-
tive. Purchasing a complete gearbox is more
economical.
2.
Inspect gearbox for leakage and bad bearings.
Leakage is a very serious problem and must be cor-
rected immediately.
NOTE:
Bearing failure is indicated by excessive
noise and side-to-side or end-play in gear shafts.
Seal Replacement (Figure 10)
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 re-
paired without removing the gearbox from the cutter.
Seal Installation
NOTE:
Proper seal installation is important. An improp-
erly 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 distor-
tion to the metal seal cage.
Figure 10.
Seal Installation
WARNING
CAUTION
2
3
4
CD1094
1
CD1092
1. Seal
2. Pipe or tube
3. Seal seat
4. Casting
Pipe or tube must
press at outer
edge of seal
Incorrect
Installation
