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160B&C TM
800-00140
Turn the pump body over then remove the shaft key and the snap ring which retains the bearing. Tap
with a soft hammer on the splined end of the shaft to force the shaft out of the body. Remove the small
snap ring located on the shaft, behind the bearing. Support the bearing inner race and press the shaft
out of the bearing. Pull the shaft seal out of the body with a suitable hooked tool.
CAUTION
CAUTION
CAUTION
CAUTION
CAUTION
Do not disassemble the relief valve S/A removed
Do not disassemble the relief valve S/A removed
Do not disassemble the relief valve S/A removed
Do not disassemble the relief valve S/A removed
Do not disassemble the relief valve S/A removed
in the following step. The unit is factory set and
in the following step. The unit is factory set and
in the following step. The unit is factory set and
in the following step. The unit is factory set and
in the following step. The unit is factory set and
could malfunction if disassembled.
could malfunction if disassembled.
could malfunction if disassembled.
could malfunction if disassembled.
could malfunction if disassembled.
2. Disassembly of Flow Control and Relief Valve Covers-See Figure 8.
Remove the plug (and o-ring latest design models) from the snap ring side of the cover. Then
remove the plug (and o-ring latest design models), that releases the spring and relief valve S/A. Insert a
suitable tool from the snap ring end of the bore. Slide the relief valve S/A from the cover. Remove the
snap ring with care - DO NOT scratch the bore.
3. Disassembly of the Priority Valve Cover-See Figure 8.
Remove the plug (and o-ring latest design models) and spring from one end of the priority valve bore, and
the plug (and o-ring latest design models) from the other end of the bore. Insert a suitable tool into the
snap ring end of the bore (snap ring used with pipe thread plugs only) and slide the priority valve spool
from the cover. If the snap ring exists, remove it from the cover. Disassemble the relief valve by
removing the plug spring poppet and shims. On later designs, a spring guide is used. See Figure 8. DO
NOT remove the seat unless inspection of the poppet contact area reveals a problem in the seat area. If
removal of the seat is required, thread the seat with a suitable tap approximately 3/8 inch into the seat.
Thread a long bolt into the seat and pull the bolt and seat from the bore with a small gear puller.
C. INSPECTION AND REPAIR
C. INSPECTION AND REPAIR
C. INSPECTION AND REPAIR
C. INSPECTION AND REPAIR
C. INSPECTION AND REPAIR
CLEANING
All parts must be thoroughly cleaned and kept clean during inspection and assembly. The close tolerance of
the parts makes this requirement more stringent than usual. Clean all removed parts, using a commercial
solvent that is compatible with the system fluid. Compressed air may be used in cleaning, but it must be filtered
to remove water and contamination. Clean compressed air is particularly useful in cleaning spools, orifices, and
cover passages.
1. Discard the used shaft seal and all o-rings. Wash the metal parts in a solvent blow them dry with filtered
compressed air and place them on a clean surface for inspection.
2. Check the wearing surfaces of the body, pressure plate, ring, and rotor for scoring and excessive wear.
Remove light score marks by lapping. Replace any heavily scored or badly worn parts.
3. Inspect the vanes for burrs, wear, and excessive play in the rotor slots. Replace the vanes and rotor if
the slots are worn.
4. Check the bearings for wear and looseness. Rotate the bearings while applying pressure to check for
pitted or cracked races.
5. Inspect the oil seal mating surface on the shaft for scoring or wear. If marks on the shaft cannot be
removed by light polishing, replace the shaft.
SERVO PUMP MAINTENANCE CONTINUED...
SERVO PUMP MAINTENANCE CONTINUED...
SERVO PUMP MAINTENANCE CONTINUED...
SERVO PUMP MAINTENANCE CONTINUED...
SERVO PUMP MAINTENANCE CONTINUED...
