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 TM 55-1905-242-14
0171 00
DISASSEMBLY (continued)
j.
Remove the two check valve plugs (51), springs (52), and check valve poppets (53) from the motor body (40).
k.
Remove the external drain plug (54) from the motor body (40).
CLEANING AND INSPECTION
1.
If not already on, don protective gloves and goggles. Clean all metal parts with cleaning solvent and dry them with clean
wiping rags.
2.
Inspect the gasket for nicks, tears, or other damage. Replace the gasket if it is not intact.
3.
Inspect the shaft sleeve for nicks, burrs, wear, or other damage. If the shaft sleeve has nicks or burrs, they may be
removed with crocus cloth. If the shaft sleeve is worn or damaged, it must be replaced.
4.
Inspect the seal seat, cup, and bellows for wear or deterioration. If the perfect lapped surface remains on the seal seat
and cup, they may be reused; if not, they must be replaced. The bellows may be reused if it is not deteriorated.
5.
Inspect the bearings for wear or damage. Check that the bearings roll smoothly. Replace the bearings if they are worn,
damaged, or do not roll smoothly.
6.
Inspect the impeller and the pump housing for wear or damage. Replace the component if excessive wear of damage is
found.
7.
Inspect the roller bearings and shaft for wear and damage. Check that the bearings roll smoothly. Replace the roller
bearings if they are worn, damaged. or do not roll smoothly. Replace the shaft if it is worn.
8.
Inspect the sealing surfaces of the front bearing housing, motor body, and gerotor housing for scratches, nicks, scoring,
or other damage. Replace or remachine the parts as necessary.
9.
Inspect the gerotor for wear or damage. The gerotor must be perfectly smooth. Replace the gerotor if it is worn or
damaged.
10. Replace the O-rings and seals.
ASSEMBLY
1.
To assemble the hydraulic motor:
a.
Place the gerotor drive key (46) into its slot on the shaft (28) and slide the gerotor (45) over it.
b.
Install the roller bearings (49) into the front bearing housing (39) and the motor body (40) if they were removed. The
bearings can be installed most easily by placing them in a freezer for one hour prior to installation. The frozen
bearings should slide easily into their bores. If freezing the bearings is not practical, install them with great care to
prevent damage during installation.
c.
Install the retainer rings (50) to secure the roller bearings (49) in their bores. The sharp edge of the retainer rings
must be positioned away from the bearing in order to hold properly.
d.
Install the thrust bearing (35) on the shaft (28) between the washers (36).
e.
Install the retainer rings (34) that locate the thrust bearing (35) and washers (36) on the shaft (28). The sharp edge
of the retainer rings must be positioned away from the washers in order to hold properly. The gaps in the retainer
rings must be placed 180 degrees away from the milled slots in the shaft.
f.
Place the shaft assembly and the front bearing housing O-ring (41) into the front bearing housing (39).
0171 00-4
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