4-72
4
HYDRAULIC PUMP
DISASSEMBLY AND ASSEMBLY
Inspection and adjustment
Checking the parts
Part Criteria Action
Piston and cylinder
block assembly
A
clearance (S) of 0.05 mm or more be-
tween
the piston and the cylinder block
assebly
Occurr
ence of scratches, scoring, ab-
normal wear
, etc. on sliding parts
Replace
Replace
Play
of piston and
shoe
A
play S of 0.2 mm or more at the pis-
ton and shoe
Replace
Shaft
and oil seal
mount
e: Oil seal mount
f: Standard dimen-
sion
A
wear amount of 0.025 mm or more at
the shaft and oil seal mount
Replace
V
alve plate Abnormal scratches (0.02 mm or
more), wear, or scorching on the sliding
surfaces
Repair
by lapping or
replace
Bushing Abnormal
wear or harmful scratches on
the sliding surfaces
Replace
Seals and O-rings At
the time of reassembly after disas-
sembly
Replace
Drive gears and driv-
en gears
Abnormal
scratches, wear or flaking of
the tooth surfaces
Replace
Ball
bearings and
needle bearings
Abnormal
scratches, wear or flaking on
the rolling surfaces
Replace the shaft as-
sembly
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