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 .