Eaton PVM018 Service Manual - Inspection, Repair & Part
EATON PVM Piston Pump Service Manual E-PUIO-II001-E4 December 2017
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End Cover & 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 bearing 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 displacement screw
for burrs, scratches and cracks. Clean up minor scratches
with 500 grit paper. Remove burrs with an India stone. The
control piston should move freely in the bore.
Swash plate Parts
1. Inspect swash plate face for wear, roughness or scoring.
Check the swash plate 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.
Shaft/Housing Parts
1. Inspect drive shaft for wear, stripped splines, and burrs.
Remove burrs with an India stone. Inspect the contact area of
bearing and shaft seal. Replace the drive shaft if wear or scor-
ing is greater than 0.005 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 replace-
ment
3. Inspect housing mounting flange for nicks and burrs. Re-
move minor nicks and burrs with an India stone. Also check
the housing 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
questionable condition.
The following should be checked regularly:
1. All hydraulic connections must be kept tight. A loose con-
nection in a pressure line will permit the fluid to leak out. If
the fluid level becomes so low as to uncover the inlet pipe
opening in the reservoir, extensive damage to the pump can
result. In suction or return lines, loose connections permit air
to be drawn into the system resulting in noisy and/or erratic
operation.
2. Clean fluid is the best insurance for long service life. There-
fore, the reservoir should be checked periodically for dirt or
other contaminants. If the fluid becomes contaminated, the
system should be drained and the reservoir cleaned before
new fluid is added.
3. Filter elements also should be checked and replaced
periodically. A clogged filter element results in a higher pres-
sure drop. This can force particles through the filter which
would ordinarily be trapped, or can cause the by-pass to open,
resulting in a partial or complete loss of filtration.
4. Air bubbles in the reservoir can ruin the pump and other
components. If bubbles are seen, locate the source of the air
and seal the lead.
Inspection, Repair & Part