Textron JACOBSEN GP400, Technical/Repair Manual

Page: 180 / 354

5-62 4252490-Rev A
HYDROSTATIC POWER TRAIN
5
Figure 5-65
NOTE
For motors with two-piece stator housings, check the
rotor clearance on each side of the rotor assembly.
18. Place rotor set (13) and wear plate (15) on a flat
surface, with the rotor (18) positioned in the stator so
that two rotor lobes (180° apart) and the rotor vane
(17) center line are on the same stator center line.
Check the rotor lobe-to-roller vane clearance with a
feeler gauge. If clearance is greater than 0.005 in.
(0.13 mm), replace the entire rotor set.
19. Check for lash (play) between drive link (11) and
splined surfaces of coupling shaft (9). No play should
be perceived.
20. Remove drive link (11) from coupling shaft (9).
21. Inspect drive link (11) for cracks, wear, or damaged
splines. Replace as needed.
22. Remove thrust bearing (10) from coupling shaft (9).
23. Inspect bearing (10) for wear, brinelling, corrosion,
and for any damaged or missing rollers. Replace as
needed.
24. Inspect the exposed portion of the coupling shaft (9)
for signs of corrosion. Clean shaft as needed.
25. Remove coupling shaft (9) from housing (3).
Figure 5-66
NOTES
• Minor shaft wear in the seal area (30) is allowed. If
wear exceeds 0.020 in. (0.51 mm), replace the
coupling shaft.
• A slight “polish” is allowed in the bearing surfaces
(28 and 29).
26. Inspect coupling shaft bearing and seal surfaces for
spalling, nicks, grooves, severe wear, corrosion, or
discoloration. Inspect internal splines and keyways
for damage. Replace as needed.
NOTE
The thrust bearing (7) is positioned between two thrust
washers (12). If replacement is required, the inner
bearing (8) must also be removed and replaced.
27. Inspect thrust bearing (7) for signs of wear, brinelling,
corrosion, and for any damaged or missing rollers.
Replace as needed.
28. Remove seal (6), backup ring (5), and backup
washer (4) from housing (3) by working them around
the unseated thrust washers (12) and thrust bearing
(7).
29. Remove housing (3) from vise, invert it, and remove
and discard seal (1).
30. Inspect housing (3) for cracks, and inspect the
machined surfaces for nicks, burrs, brinelling, or
corrosion. Remove burrs that can be removed
without changing the dimensional characteristics.
Replace housing as needed.
TN3893
13
18
17
TN3896
28
29
30