Textron JACOBSEN GP400, Technical/Repair Manual

Page: 190 / 354

5-72 4252490-Rev A
HYDROSTATIC POWER TRAIN
5
NOTICE
NOTES
• Always install new seals and O-rings for assembly.
Used parts may leak.
• If the housing or bearings are being replaced,
perform step 1 through 6. If housing or bearings were
not replaced, proceed to step 7.
!
CAUTION
1. Pack outer bearing (2) with grease that meets or
exceeds NLGI Grade 2 LB specifications.
!
CAUTION
NOTE
Install bearings and seals using a seal and driver set and
press.
2. Install (press) outer bearing (2) into housing (3) to a
depth of 0.290–0.310 in. (7.37–7.87 mm) from the
outside end of the bearing counterbore.
3. Place a new outer seal (1) into housing (3), with the
lip facing out, and press the seal into the housing
until the seal is flush to 0.020 in. (0.51 mm) below the
end of the bearing counterbore.
4. Install a new backup ring (4), backup washer (5), and
seal (6) into housing (3). Position the seal so that the
lip is facing toward the inside of the motor.
5. Install a new thrust bearing (7) and two thrust
washers (12) into the housing. The thrust bearing
must be positioned between the two thrust washers.
6. Install (press) inner bearing (8) into housing (3) to a
depth of 0.105–0.125 in. (2.67–3.18 mm) below the
housing wear plate contact surface.
7. Place the housing (3) in a soft-jawed vice, with the
coupling shaft bore pointed down and the vise jaws
firmly clamping each side of the housing mounting
flange.
Figure 5-76
8. Install a new backup ring (4), backup washer (5), and
seal (6) into housing (3), working the ring, washer,
and seal around the thrust bearing (7) and thrust
washers (12). Position the seal so that the lip is
facing toward the inside of the motor. Make sure the
components are properly seated into their respective
counterbores.
9. Make sure thrust bearing (7) and thrust washers (12)
are properly seated.
10. Apply masking tape around the threads on the
coupling shaft (9), to prevent damage to seals during
installation.
11. Install the coupling shaft (9) into housing (3), making
sure that coupling shaft is seated against thrust
washer (12). When properly seated, the end of the
coupling shaft will be approximately 0.10 in.
(2.54 mm) below the housing wear plate surface.
12. Install thrust bearing (10) on the end of coupling shaft
(9).
It is important that all motor parts are absolutely
clean, as contamination can result in serious
damage and/or improper operation.
Never use shop towels or rags to dry parts after
cleaning, as lint may clog passages. Dry parts
using compressed air only.
Required Materials
Seal Kit (Jacobsen PN 891910)
The outer bearing (2) is not lubricated by the
system’s hydraulic fluid. Thoroughly pack and
coat the bearing with grease before installing.
When installing bearings, the bearing must be
positioned so that the bearing installer tool is
applying force against the lettered side of the
bearing shell.
TN3900
6
12
7
12
5
4
3