4) INSPECTION AND REPAIR
(1)Check all disassembled parts for damage
and wash undamaged or usable parts in
clean diesel fuel or kerosene except rubber
parts.Inspect all parts referring to these
points,and repair or replace defective parts.
(2) Housing(casing)
①The gear pump is originally designed so
that the gears come into light contact with
the side of the pump body
②Therefore some evidence of contact can be
found around the intake port of a pump
once used.
③The normal contact tracing is less than half
the length of the gear housing bore and less
than 0.05 mm(0.0020 in)in width.If width
A is more than 0.1 mm(0.004 in), replace
the gear pump set.
(3) Bushing
① With clean working fluid,surfaces are
rarely scratched and should be smooth.
② If there are many scratches on the bore
walls,or on parts which are in contact with
the gears,which can be readily felt or when
the latter parts are darkened,the gear pump
set should be replaced.
Fig. 9-26 Bushing
Problem and causes are as below
a.contaminated fluid
9-13
Fig. 9-24 Housing (casing)
Fig. 9-25 Housing (casing)
b.overload by relief valve damage
c.cavitation or airation
d.overheat of fluid.
e.Low density of fluid
④ Some evidence of contact can be found
around the intake port of a bushing once
used.The normal contact tracing is less than
half the length of the bushing bore and less
than 0.03mm(0,0012 in)in width.If width is
more than 0.03 mm (0.0012 in).Replace the
bushing.
Fig. 9-27 Bushing
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