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 TM 10-3930-660-24-2
PISTON PUMP MAINTENANCE - CONTINUED
0256 00
INSPECTION - CONTINUED
4.
Inspect pins (16) for equal length, excessive wear and bends.
1
5.
Replace all pins (16) if one is defective.
4
6.
Inspect shoe plate (19) for excessive wear and crack-
ing in the area of spherical washer (24).
6
2
7.
If heavy wear or cracks are found, replace the shoe
plate (19) and spherical washer (24) at the same time.
5
8.
Measure end play between piston (7) and shoe (23).
End play must not exceed 0.005 in. between piston
and shoe.
3
409-4101
9.
Measure face thickness of each shoe. The face thickness of all shoes must be within 0.001 in. (0.025 mm) of each other.
10.
Inspect cylinder block bore for wear, scratches and/or erosion between cylinders. Check the spring, washers and retain-
ing ring located within the cylinder block for wear.
11.
Check each cylinder block bore for excessive wear by
50
1
sliding the piston and shoe subassemblies through the
bores. If binding is evident, clean cylinder block and
piston, lubricate parts with clean hydraulic fluid and
again check for binding.
12.
Press check valve (43) against spring (44). Valve (43)
should return and hold firm against seat (42).
44
13.
If replacement is necessary, spring (44), valve (43) and
43
seat (42) must be replaced as a set.
42
409-1479
ASSEMBLY
1.
If removed, install two plugs (50) to compensator (1).
2.
If removed, install alignment pins (49) into housing
(6).
49
44
6
409-1480
0256 00-6
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