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 TM 55-1905-223-24-10
REPAIR
WARNING
The fumes from cleaning solvents are dangerous. Use solvents in open air or well
ventilated space. Wear proper eye protection and rubber glove.
a. Wash all metal parts in cleaning solvent, being especially thorough with ports and passages of pump housing (54)
and valve block (21). Inspect all packing grooves and mating surfaces for severe wear or other damage. Any
metal parts showing severe wear should be replaced. Severe wear is 5.0% of total metal area or greater.
b. Dry each part with compressed air and reassemble using new parts as required.
NOTE
After pump is rebuilt, care should be taken to keep contaminants out of internal
components. This can be done by placing plugs in all hydraulic ports or by
enclosing pump in polyethylene (plastic) bag.
ASSEMBLY
NOTE
When installing performed packing, backup washers and pistons, coat with clean
system oil prior to assembly.
a. Into pump housing (54), install housing g asket (53), spring (46), seats (45 and 44), spring pin (43), yoke (41),
annular ball bearings (52), pintel bearing spacers (51), preformed packing (50), shim kits (49), covers (48), and
hexhead cap screws (47).
b. On shaft (40), install pump plate (38), spherical washer (37), retainer pin (36), and linear piston (39) into pump
plate (38). Then install pin (35), cylinder block (34) spring washer (33), spring (32), spring washer (31), and
retaining ring (30).
c. Install into pump housing (54) annular ba ll bearing (42), shaft assembly (40), shaft seal (56), and shaft retaining
ring (57). At opposite end of shaft install wafer plate (28), bearing spacer kit (29) with chamfer toward shoulder of
shaft, and annular ball bearing (27).
4-10
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