28
EATON
Heavy-Duty Series 2 Hydrostatic Pumps Parts and Repair E-PUPI-TS004-E October 2004
13. If the pump has
optional internal pres-
sure override valve
plugs, use a 12 mm
hex key or allen
wrench to remove the
two plugs, springs
and spring end.
Note:
The pressure
override valve come
in two configurations,
Shim adjustable and
externally adjustable.
To preserve factory
settings, do not mix
“Pressure Override”
parts from one valve
to another.
14. Using a pair of needle
nose pliers remove
the valve poppet.
11. Using a 9/16" hex key
or allen wrench,
remove the two high
pressure relief valves
or check valve sub-
assemblies.
9.
Remove the control
valve feedback sub-
assembly by lifting it
straight up.
10. ONLY remove orifices
if orifice size needs to
be changed. The type
of control and applica-
tion determine orifice
size and location.
Orifice sizes are
stamped on the face
of each orifice.
Orifices are staked to
retain them in their
pockets.
8. Remove the control
valve gasket and
discard.
7. Lift the valve assem-
bly straight up and
away from the pump.
Take care not to
damage the feedback
link or swashplate
link.The swashplate
link must remain
seated on the
swashplate pin.
Continue with step 9.
Note:
Depending on the configuration, the pump will
have either high pressure relief valves or check valve
subassemblies. High pressure relief valve settings are
marked on the end of each relief valve subassembly.
When high pressure relief valves are used, the valve
located in the low pressure side of the closed circuit
acts as the inlet check valve.
Disassembly
Shim Adjusted POR Valve
Externally Adjustable POR Valve
12. Using a 9/16" hex key
or allen wrench,
remove the socket
head plug. This plug
retains the clocking
link, that is removed
later (Step 44).
12a. Remove the lower
clocking link
retaining plug. Use
a 5/8 allen wrench.
