30 EATON 620 Mobile Open Circuit Piston Pump Service Manual E-PUPI-TS018-E2 November 2017
Inspection, repair and
part replacement
End cover and
associated parts
1. Inspect end cover for erosion, cracks and
burrs. Clean up minor burrs with an India
stone. If erosion or cracks are found,
replace the end cover.
2. Inspect roller bearing and bearing race for
nicks and pitting. Make sure the roller bear-
ing turns freely within the bearing race.
If the roller bearing needs replacement,
both the roller bearing and the bearing race
must be replaced.
3. Inspect valve plate for erosion, excessive
wear, heavy scratches and cracks. If any
of the above conditions are found, replace
the valve plate.
4. Inspect control piston and maximum dis-
placement screw for burrs, scratches and
cracks. If any of the above conditions are
found, replace the control piston. The con-
trol piston should move freely in the bore.
3. Inspect housing mounting flange for nicks
and burrs. Remove minor nicks and burrs
with an India stone. Also check the hous-
ing for damaged or stripped threads. If any
thread is damaged, replace the housing.
4. Check remaining pump parts for excessive
wear, damaged threads, burrs, cracks and
erosion. Replace any part that is in ques-
tionable condition.
Swashplate parts
Shaft/housing parts 1. Inspect drive shaft for wear, stripped
splines and burrs. Remove burrs with India
stone. Inspect the contact of the area
bearing and shaft seal. Replace the drive
shaft if wear or scoring is greater than
.0127mm T.I.R. (Total Indicator Reading)
2. Inspect drive shaft bearing for roughness,
pitting of rollers and excessive end play.
Replace if defective. If the bearing needs
to be replaced, the bearing race also
requires replacement.
1. Inspect swashplate face for wear, rough-
ness or scoring. Check the swashplate
hubs and bearing surfaces for wear and
cracks. Replace if defective.
2. Inspect saddle bearing surfaces for wear,
pitting, and smooth operation. Replace if
necessary.
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