Textron JACOBSEN GP400, Technical/Repair Manual

Page: 187 / 354

HYDROSTATIC POWER TRAIN
4252490-Rev A 5-69
5
15. Remove and discard seal rings (14) from each side
of the manifold (19).
16. Inspect the surface of the manifold that makes
contact with commutator and commutator ring. A
polished pattern (not scratches) from the commutator
is normal. Inspect the manifold for cracks, burrs,
wear, scoring, spalling, or brinelling. Replace as
needed.
NOTES
• The rotor set components are loose and can fall
apart when removed. When removing, use caution
and remove rotor set (13) as a unit.
• Do not disassemble the rotor set. If replacement is
necessary, replace the entire assembly.
• The drive link (11) may come away from the coupling
shaft (9) when removing the rotor set (13) and wear
plate (15). Move the drive link as needed to loosen
the drive link from the rotor set and wear plate.
17. Remove rotor set (13) and wear plate (15) as a unit.
18. Inspect rotor set (13) for nicks, scoring, or spalling on
any surface and for broken or worn splines. If any
damage or wear is noted, replace the entire rotor set
as an assembly.
19. Remove and discard seal rings (14) from each side
of wear plate (15).
20. Inspect wear plate (15) for cracks, scoring, or
brinelling. Replace as needed.
Figure 5-73
NOTE
For motors with two-piece stator housings, check the
rotor clearance on each side of the rotor assembly.
21. 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.
22. Check for lash (play) between drive link (11) and
splined surfaces of coupling shaft (9). No play should
be perceived.
23. Remove drive link (11) from coupling shaft (9).
24. Inspect drive link (11) for cracks, wear, or damaged
splines. Replace as needed.
25. Remove thrust bearing (10) from coupling shaft (9).
26. Inspect bearing (10) for wear, brinelling, corrosion,
and for any damaged or missing rollers. Replace as
needed.
27. Inspect the exposed portion of the coupling shaft (9)
for signs of corrosion. Clean shaft as needed.
28. Remove coupling shaft (9) from housing (3).
Figure 5-74
NOTES
• Minor shaft wear in the seal area (36) is allowed. If
wear exceeds 0.020 in. (0.51 mm), replace the
coupling shaft.
• A slight “polish” is allowed in the bearing surfaces
(34 and 35).
29. 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) also must be removed and replaced.
TN3893
13
18
17
TN3896
34
35
36