39
EATON
Heavy-Duty Series 2 Hydrostatic Pumps Parts and Repair E-PUPI-TS004-E October 2004
33. Note one side of the
eccentric ring is wider
than the other and
that the wide side has
an identification “dot.”
The eccentric ring
also determines
charge pump input
rotation.
34. For pumps with clock-
wise input rotation,
install the eccentric
ring so the identifica-
tion “dots” are
aligned. The wide side
of the eccentric ring is
on the (B) side of the
end cover.
For pumps with coun-
terclockwise input
rotation, install the
eccentric ring so the
identification “dots”
are not aligned. The
wide side of the
eccentric ring is on
the (A) side of the end
cover.
35. Lightly coat the
charge pump drive
key with petroleum
jelly to help hold it in
position during
assembly. Install the
drive key in its recess
located in the charge
pump coupling.
Install the gerotor star
on the charge pump
coupling by aligning
with the drive key.
Next, install the
charge pump coupling
subassembly and
gerotor’s outer ring
into the pump end
cover.
36. Lightly coat the
charge pump sealing
ring with petroleum
jelly and install it into
the end cover.
37. Note the small and
large recess cast into
the charge pump
cover subassembly.
The large recess side
of the charge pump
cover must face
toward the charge
pump inlet.
32. For pumps with clock-
wise input rotation,
install the charge
pump valve plate so
the wide side of the
kidney slot is on the
(A) side of the pump
end cover.
For pumps with coun-
terclockwise input
rotation, install the
plate so that the wide
side of the kidney slot
is on the (B) side of
the pump end cover.
31. Note one side of the
kidney slots in the
charge pump valve
plate is wider than the
other. Note the (A)
and (B) stamped on
the end cover, next to
the high pressure
ports. The position of
the charge pump
valve plate deter-
mines charge pump
input rotation.
Charge Pump Installation
Assembly
Small Recess
Large Recess
