Fluke Calibration 4322-SYS-NAVAIR, Service Manual

Page: 120 / 186

4322
Service Manual
5-26
clevis can be removed when the low stroke of the cam is positioned in front of a
clevis. See “Pump Cam Disassembly” on page 5-17.
4. To replace the piston seals (

,

, and

):
a. Remove the entire piston clevis assembly from the ICM assembly.
b. Remove the piston (

) from the piston clevis assembly (

).To loosen, use the
hex tool as illustrated in steps 4 and 5 in Figure 5-11.
c. Remove the seal retainer (

) from the end of the piston (

) with a small
flathead screwdriver as shown in Figure 5-10.
d. Remove the old o-ring (

), seal (

), and centering ring (

). Discard the seals
to make sure they are not used again.
e. Place the new o-ring (

), seal (

), and centering ring (

) on the piston (

) as
shown in Figure 5-10. Add a small amount of Loctite 222 to the threads of the
seal retainer (

). Fully tighten the seal retainer (

).
Centering Ring (beveled side towards seal)
Seal
O-Ring
Seal Retainer
hbx080.eps
Figure 5-10. Seal Installation Tool
5. Insert the piston into the ICM cylinder as follows:
Note
The piston must be inserted into the ICM cylinder with the aid of the piston
seal installation tool in order to compact the seals to achieve a good seal.
The insertion side of the piston seal installation tool cylinder is wide and
gradually tapers to the same diameter of the ICM cylinder. Use the
following instructions to reinstall the piston with the piston seal installation
tool: