29
EATON
Heavy-Duty Series 2 Hydrostatic Pumps Parts and Repair E-PUPI-TS004-E October 2004
14. Using a 1-1/4 in.
socket or end wrench,
remove the charge
pressure relief valve
from the pump
housing.
Note:
The current version charge relief is a factory set
cartridge design pressure setting. This is
stamped on the valve. This version consists of a
cap, spring and poppet.
15. Using a 5/16 in. hex
key or allen wrench,
remove the cap
screws from the
auxiliary pump
adapter flange.
Remove the mounting
flange from the pump
end cover.
16. Turn the auxiliary
pump adapter over
and using an O-Ring
pick or similar tool,
remove the sealing
ring.
17. Using a 1/4 bit socket
or hex key, remove
the cap screws for the
charge pump cover.
18. Using a large pair of
adjustable pliers
remove the charge
pump cover. Gently
rock the cover back
and forth as you pull
upward.
19. Remove the sealing
O-ring for the charge
pump cover from the
end cover.
20. Remove the charge
pump coupling and
gerotor star.
Note:
The gerotor star
is a slip fit on the
coupling and is driven
by a small key. Use
caution not to lose
the key. Slide the
star from the
coupling. It is not
necessary to remove
the retaining ring
from the coupling.
Charge Relief Valve Removal
Charge Pump & Auxiliary Pad Removal
21. Remove the gerotor
outer ring from the
eccentric ring located
in the end cover.
22. Remove the eccentric
ring. Note position of
the eccentric ring for
reassembly. Eccentric
ring position in the
end cover is used to
determine charge
pump input rotation.
Disassembly
Current production version
Obsolete Relief Valve Design
