Service Manual
27PC Series
Refer to Figure 8.
Disassembly
1. Prior to removal of the charge pump cover, place
a mark on the cover and end cap for alignment
at assembly.
2. Using a 1/2-inch wrench, loosen the charge
pump cover bolts (10) from the end cap (2). While
holding the charge cover (6) in place, remove
the charge cover bolts (10).
3. Remove the charge cover, O-ring (8) and
gerotor items (7). Carefully check for and remove
the charge spring and charge ball (44).
4. For thru shaft charge pump, remove the shaft
seal.
Inspection
1. Inspect the charge cover O-ring (8) and running
surfaces for damage. Inspect the spring, check
ball (44), and mating seat in the end cap (2) for
damage or foreign material.
2. Inspect the charge cover bore for damage
corrosion or wear.
Assembly
1. Lubricate the new shaft seal with petroleum jelly.
2. Press the shaft seal into the charge cover. Be
careful not to damage the shaft seal or charge
cover bore.
3. Position the pump with the input shaft down, and
the end cap (2) horizontal. Place the charge ball
(44) in the end cap (2) charge passage so the
ball mates to the end cap (2) charge ball seat.
Place the charge spring, on top of the charge
ball.
4. Insert the inner gerotor over input shaft (18).
5. Align the outer gerotor to fit over the inner gerotor.
6. Insert the O-ring (8) into the groove in the charge
cover.
7. Position the charge cover and O-ring with the
aligning mark on the end cap. Place the charge
cover and O-ring as one piece over the charge
spring and gerotor assembly. Insure the spring
fits into the charge cover spring retaining groove.
8. Align and insert the charge pump cover bolts
(10) into the end cap (2). Tighten to the correct
torque value. See Table 2, page 22 (Torque
Values).
REMOVAL, INSPECTION AND
ASSEMBLY OF THE STANDARD OR
THRU SHAFT CHARGE PUMP
NOTE: For thru shaft charge pump assembly,
follow steps 1 thru 8. For standard charge pump,
follow steps 3 thru 8.
Figure 8. PC Pump Standard or Thru Shaft Charge Pump
NOTE: If the end cap (2) is to be removed from the
housing, do not assemble the charge pump (6)
until the end cap is installed on the housing.
8
7
6
THRU SHAFT
(2X) 10
(2X) 10
6
7
8
STANDARD
2
18
44