ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
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TACTICAL WATER PURIFICATION SYSTEM (TWPS)
UNIT MAINTENANCE PROCEDURES
HIGH PRESSURE PUMPS
PISTON BODY, CAM SIDE
TOOL
BEARING
CYLINDER LINER
STRIKE HERE
O-RING
BODY
CYLINDER LINER
ALIGNMENT PIN HOLE
BODY BEARING
Figure 30. Piston Cylinder Liner Removal.
d. The alignment pins are press-fitted into the body to properly align it relative to the valve
housing.
e. Remove any superficial rust/dirt prior to reassembly.
f. Remove and discard O-rings.
g. Inspect the body bearing for wear or damage. Check if the body bearing inner diameter
is within the 2.010 in. requirement. If outside requirement, replace bearing.
15. Remove the body bearing using the FMC P502677 bearing removal and installation tool as
follows (see Figure 31):
a. Place the piston body on its side on a flat surface.
NOTE
The worn bearing will be pressed out toward the cam side of the piston body.
b. Insert the pilot plug into the worn bearing with the pilot plug stopping on the bearing.
c. Insert the tension rod through the pilot plug so that the nut of the tension rod contacts the
shoulder of the pilot plug.
d. Place the "adapter can" over the tension rod and slide it down the tension rod until it rests
on the piston body.
e. Screw the speedball handle onto the tension rod until the speedball handle contacts the
adapter can.
f. Continue to rotate the speedball handle clockwise until the bearing is pulled from the
bearing housing.
g. Remove the bearing tool from the old bearing.
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