30
Repair Information
– Series 2 Variable Displacement Pump
Using a 1/4 bit socket or
hex key, remove the charge
pump cover retaining cap
screws. (see Figure 19)
With the cap screws re-
moved, remove the charge
pump cover by using a
large pair of adjustable pli-
ers. Remove by gently
rocking the cover back-
and-forth as you pull up-
ward. (see Figure 20)
Next, remove the charge
pump covers sealing O-
ring from the pump end
cover. (see Figure 21)
Remove the charge pump
coupling and gerotor star.
(see Figure 22)
The gerotor star is a slip fit
on the coupling and is
driven by a small key, cau-
tion must be used not to
lose this key. To remove
the star, simply slide it
from the coupling. It is not
necessary to remove the
retaining ring from the
coupling as it is used for location purposes only. (see Figure
23)
Next, remove the gerotor
outer ring from the eccen-
tric ring located in the
pump end cover. (see Fig-
ure 24)
With the gerotor outer ring re-
moved from the eccentric ring,
remove the eccentric ring. The
position of this eccentric ring
in the end cover is one of the
items used to determine
charge pump input rotation.
Before removing you may want
to note its position for reas-
sembly. (see Figure 25)
Next, remove the charge pump
valve plate. The position of this
valve plate is also used to de-
termine charge pump input ro-
tation. Before removing you
may also want to note its po-
sition. (see Figure 26)
Using the proper size socket or
end wrench, remove the end
cover retaining cap screws.
Caution should be used when
removing the retaining cap
screws as the end cover has
an internal preload. If the end
cover does not rise when the
cap screws are loosened, you
may have to tap the end cover to break the gasket seal.
With the retaining cap screws removed, carefully remove the pump
end cover. When removing, Caution must be used not to drop any
internal parts such as the valve plate, bearing cup, etc. which may or
may not stick to the end cover. Caution must be used when handling
all close tolerance parts. (see Figure 27)
Carefully turn the end cover
over and remove the valve
plate and dowel pin. (see Fig-
ure 28)
With the valve plate removed,
remove the rear bearing cup
from the end cover. This bear-
ing cup is a slip fit into the end
cover. (see Figure 29)
Figure 24
Figure 27
Figure 20
Figure 19
Figure 23
Figure 25
Figure 26
Figure 28
Figure 22
Figure 21
Figure 29
