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Page Title:
Figure 3-3. Hydraulic pump motor, disassembly and reassembly. |
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 TM 10-3930-611-35
1.
Screw (8 reqd)
32.
Spring (8 reqd)
2.
Washer, lock (19 reqd)
33.
Screw (4 reqd)
3.
Screw (ref item #1)
34.
Washer, lock (ref item #2)
4.
Washer, lock (ref item #2)
35.
Connector (short)
5.
Foot
36.
Connector (long)
6.
Bracket, bearing, drive end
37.
Connector, cross (2 reqd)
7.
Bearing, ball, drive end
38.
Bushing (10 reqd)
8.
Key
39.
Bearing, ball, front end
9.
Screw
40.
Pin, cover (4 reqd)
10.
Dover (half)
41.
Yoke and bearing support
11.
Cover (half)
42.
Screw (3 reqd)
12.
Screw (4 reqd)
43.
Washer, lock (ref item #2)
13.
Washer, lock (ref item #2)
44.
Foot
14.
Nut, hex (10 reqd)
45.
Nut, shaft
15.
Washer, lock (10 reqd)
46.
Armature (complete)
16.
Nut, hex (ref item #14)
47.
Key, commutator
17.
Washer, lock (ref item #15)
48.
Key, armature
18.
Washer, flat (12 reqd)
49.
Shaft
19.
Bolt, hex hd (5 reqd)
50.
Nut, hex (ref item #14)
20.
Washer, flat (ref item #18)
51.
Washer, lock (ref item #15)
21.
Screw (8 reqd)
52.
Nut, hex (ref item #14)
22.
Washer, flat (8 reqd)
53.
Washer, lock (ref item #15)
23.
Bushing (8 reqd)
54.
Washer, flat (ref item #18)
24.
Holder, brush (4 reqd)
55.
Washer, flat (ref item #18)
25.
Washer, insulation (4 reqd)
56.
Bolt, hex hd (ref item #19)
26.
Screw (8 reqd)
57.
Bushing (ref item #38)
27.
Washer, lock (8 reqd)
58.
Screw (8 reqd)
28.
Brush (4 reqd)
59.
Pole, main (4 reqd)
29.
Screw (ref item #26)
60.
Coils, field (1 set reqd)
30.
Washer, lock (ref item #27)
61.
Frame
31.
Bracket, angle (reqd)
Figure 3-3. Hydraulic pump motor, disassembly and reassembly.
3-3. Drive Motor
missing hardware. If necessary, undercut commutator
a. Removal.
mica to a depth equal to the thickness of the mica and
take a light cut from the commutator in a lathe. If
(1) Remove the parking brake linkage
brushes are shorter than 13/16 inch, replace and sand in
(TM 10-3930-611-12, para 3-42).
as necessary. Replace damaged parts.
(2) Disconnect the brake lines to the
wheel cylinder. (TM 10-3930-611-12).
the probes to each end of the field coil terminals to test
(3) Remove the mast assembly (para 3-
for continuity. Test for grounded field coils by touching
one probe to the field coil circuit and the other to the
(4) Remove the differential (para 3-26).
field core frame. If lack of circuit continuity or a
(5) Refer to figure 3-4 and remove the
grounded coil is indicated, replace the field coils. Touch
drive motor.
one test probe to the commutator and the other to the
armature core.
If a grounded armature coil is
disassemble the drive motor assembly.
c. Cleaning, Inspection and Repair.
evidenced, replace the armature.
e. Reassembly.
Refer to figure 3-5 and
(1) Wipe all electrical parts with a clean,
reassemble the drive motor.
dry cloth. Clean all other parts with dry cleaning solvent
f.
Installation.
(Federal Specification P-D-680) and dry thoroughly.
(1) Refer to figure 3-4 and install the drive
(2) Inspect all wires and terminals for
motor.
breaks and corrosion. Inspect brushes for amount of
(2) Install the differential (para 3-26).
wear and evidence of chipping. Inspect brush holders
(3) Install the mast assembly (para 3-10).
for proper spring tension (2.5 lbs.). Inspect commutator
(4) Connect the brake lines to the wheel
for burns and high mica. Inspect all other parts for
cylinders (TM 10-3930-611-12).
breaks, cracks, dents, loose or missing mounting
(5) Install the parking brake linkage (TM
hardware, or other defects.
10-3930-611-12, para 3-42).
(3) Clean corrosion from wires and
electrical connections, tighten or replace loose or
3-4
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