ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
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TACTICAL WATER PURIFICATION SYSTEM (TWPS)
UNIT MAINTENANCE PROCEDURES
GENERAL MAINTENANCE
3) Check that the shaft bottom O-ring hasn't slipped out of position so that it sticks
out the bottom of the base plate. If the O-ring is out of position, remove the shaft,
replace the O-ring if damaged or reseat the O-ring on the shaft and reinsert the
shaft in the base plate.
4) Carefully lower the body of the actuator over the top of the pinion shaft and onto
the base plate, finishing with a firm push to make sure that the top of the shaft is
fully seated in the body bore.
5) Check that the holes in the base plate line up with the holes in the bottom of the
actuator body. If they do not, rotate the base plate 90 so that the holes do line
up.
6) Secure the base plate to the body using the four cap head screws and spring
washers.
d. Position the pinion shaft as follows:
1) Set the actuator on its base plate with the air connection plate facing you.
2) Insert the shaft adapter into the top of the pinion shaft.
3) If the actuator is for use on a normally open valve (V-111, V-112, V-201, or V-
202) insert a suitable tool (such as the nose of a needle nose pliers) into the
shaft adapter and turn the pinion shaft so that both pinion shaft keyways are at a
45 angle to the air connection plate (see Figure 21).
4) If the actuator is for use on a normally closed valve (V-113, V-401, or V-402)
insert a suitable tool (such as the nose of a needle nose pliers) into the shaft
adapter and turn the pinion shaft so that both pinion shaft keyways are at a 45
angle to the left end of the actuator body (see Figure 21).
5) Remove the shaft adapter from the top of the pinion shaft.
PINION SHAFT KEYWAY POSITION
PINION SHAFT KEYWAY POSITION
FOR A NORMALLY OPEN VALVE
FOR A NORMALLY CLOSED VALVE
BEFORE ACTUATOR PISTONS ARE INSTALLED
BEFORE ACTUATOR PISTONS ARE INSTALLED
AIR CONNECTION PLATE
Figure 21. Position of Actuator Pinion Shaft Keyways Prior to Installing Pistons.
e. Lubricate the pinion shaft teeth with molybdenum disulfide grease.
f. Assemble the pistons to the actuator body as follows:
1) Lubricate the piston teeth with molybdenum disulfide grease.
2) With the air connection plate facing you, insert the right piston into the bore of the
actuator body with its backing pad toward you and insert the left piston into the
bore with its backing pad away from you (see Figure 20).
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