24 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
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