Textron JACOBSEN GP400, Technical/Repair Manual

Page: 179 / 354

HYDROSTATIC POWER TRAIN
4252490-Rev A 5-61
5
NOTE
The disassembly procedure for the left front and rear
(3WD) wheel motors is the same. The motors differ in
size, with the rear (3WD) motor being slightly larger.
Figure 5-64
1. Place wheel motor (26) in a soft-jawed vice, with the
coupling shaft pointed down and the vise jaws firmly
clamping each side of the housing mounting flange.
2. Scribe or mark lines (27) across the side of wheel
motor sections to mark the position and orientation of
motor segments before disassembly.
NOTE
Use caution when removing screws, as motor segments
will be free to move.
3. Remove seven screws (24) from end cover (23).
4. Inspect screws (24) and seal rings (25) for damage.
Replace as needed.
5. Remove end cover (23) and seal ring (14) from
commutator (20) and commutator ring (22).
6. Inspect the surface of the end cover that makes
contact with commutator and commutator ring. A
polished pattern (not scratches) from the commutator
is normal. Discoloration indicates excess fluid
temperature, thermal shock, or excess speed and
requires inspection of the end cover, commutator,
manifold, and rotor set. Replace as needed.
7. Remove commutator ring (22) and commutator (20).
8. Remove seal ring (21) from commutator (20) using
compressed air to blow air into the ring groove until
the seal ring is lifted out of the groove.
NOTE
If any damage or wear is noticed in the commutator or
commutator ring, both must be replaced as a matched
set.
9. Inspect commutator ring (22) for cracks or burrs.
10. Inspect commutator (20) for cracks, burrs, wear,
scoring, spalling, or brinelling.
NOTES
• The manifold is constructed of plates bonded
together to form an integral component and must not
be disassembled.
• Compare the configuration of each side of the
manifold and note which side of the manifold is
positioned against the rotor set to ensure correct
installation.
11. Remove manifold (19).
12. Remove and discard seal rings (14) from each side
of the manifold (19).
13. 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.
14. Remove rotor set (13) and wear plate (15) as a unit.
15. 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.
16. Remove and discard seal rings (14) from each side
of wear plate (15).
17. Inspect wear plate (15) for cracks, scoring, or
brinelling. Replace as needed.
TN3890
26
27