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EATON
620 Mobile Open Circuit Piston Pump Service Manual E-PUPI-TS018-E2 November 2017
Disassembly
1. Remove control piston plug assembly and
install swashplate locator tool
Note:
The swashplate locator tool and hold
down plug will prevent the swashplate from
moving . This step is designed to force the
swashplate to a neutral position to enable easy
removal of the rotating group while retaining
the swashplate . With the locator tool in place,
tighten the adjustment screw so that control
piston is compressed .
Before attempting to
disassemble clean the pump
exterior . Dispose of leakage
oil and oily cloths in an
environmentally responsible
manner . All parts within
the unit must be kept clean
during the overhaul process .
Handle each part with great
care, marking as necessary
to ensure proper reassembly .
The close tolerance of the
parts make this requirement
very important . Clean all the
parts that are removed from
the unit with a commercial
solvent that is compatible
with the system fluid .
Compressed air may be
used in the cleaning process .
However it may be filtered
to remove water and other
contaminants .
3. Remove compensator
5. Remove valveplate from end cover
Note:
The valve plate may stick to end cover . Use
caution so that valve plate does not fall off . Mark
the housing and end cover to ensure the correct
orientation . Remove the four cap screws that hold
the end cover in place .
4. Remove end cover and cap screws
2. Install swashplate hold down plug and
adjust the swashplate locator tool