ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
0053 00
TACTICAL WATER PURIFICATION SYSTEM (TWPS)
UNIT MAINTENANCE PROCEDURES
HIGH PRESSURE PUMPS
11. Lubricate the bearing plate bearing surface with glycerin.
12. Install the cam as follows (see Figure 27):
a. Carefully rinse the cam with fresh water.
NOTE
Do not pierce or damage the shaft seal in any way.
b. Slide the clean camshaft through the bearing plate bearing and shaft seal.
13. Inspect and (if necessary) replace the piston cluster (see Figure 28).
NOTE
The piston cluster supports the downward force of the pistons on the rotating cam
surface. During the break-in process, the piston cluster is polished-in to match the
cam surface. The piston cluster must be replaced if damage and/or wear is
discovered.
Damaged bearings may cause damage to the cam surface. Inspect and replace the
piston cluster and cam assembly as needed.
It is critical during reassembly that the pistons line up properly with the piston
cluster.
a. Inspect the piston cluster cups and flat surfaces for wear and cracking. Replace if
needed.
b. Carefully clean and rinse the piston cluster with fresh water before installing in the pump.
c. Add a drop of glycerin to each piston cluster cup and flat (bearing) surface.
NOTE
The piston cluster cups must face upwards. The position of the piston cluster
relative to the pistons is critical and should be carefully maintained during the next
two reassembly steps.
d. Place the piston cluster onto the upper cam surface.
HPP CAM
HPP PISTON CLUSTER
HPP BEARING PLATE
Figure 28. Piston Cluster Installation.
0053 00-25
