Piston Seal; Piston Seal Replacement - Fluke Calibration 4322-SYS-NAVAIR Service Manual

Piston Seal Replacement

Use the following instructions to replace piston seal in the piston pump (see Figure 4-17).
1. Remove the pump bracket assembly from the chassis. See "Pump Bracket" on page
4-16.
2. Remove the piston pump head along with the Clippard valves. See Figure 4-16. The
Clippard valves can stay attached to the pump head.
a. Use a pair of soft jaw channel lock pliers to loosen (counterclockwise) the
atmospheric solenoid valve (). Once loose, turn by hand to remove. Be careful
not to lose the poppet and spring from inside the valve seat.
b. Remove the four screws () and gently pull off the pump head.
3. Remove the four screws () that secure the crank cover () on the rear portion of
the pump cylinder () to gain access to the piston crank ().
4. Rotate the piston crank () so that the piston is at the top of piston shaft. With a
marker, mark the alignment position on the piston crank () and also which hole on
the crank it was installed in. This will aid with reinstallation.
5. Mark the outer face of the connecting rod () with an orientation marking. Make
sure this mark is showing when reinstalled.
6. Remove the crank screw (). Use a pair of rubber gripped pliers to hold the piston
crank () in place while turning the screw.
7. Push the piston out of the top of the cylinder.
8. Remove the o-ring from the piston.
9. Clean the piston with alcohol.
10. Lubricate a new o-ring with super-lube (Synco item number 21030). Use of this
grease is important.
11. Install the new o-ring.
12. Lubricate the piston wrist pin where the crank screw () goes through with film of
super-lube. Do not use too much grease.
13. Push the piston () into cylinder () as follows:
a. Place the round chamfered piston installation guide (), part of kit 4237107, on
top of the cylinder ().
b. Insert the piston () into the piston installation guide () then use a soft tip tool
to push the piston into the cylinder (). The chamfered walls of the piston
installation guide will aid with the installation and prevent the seal from
becoming damaged when installed.
6
7
8
14. Reconnect the connecting rod () to the crank () in the same screw hole used
Optical switch removed for clarity and is
not necessary to remove from bracket
View of Crank Shaft
Orientation
mark
Alignment
mark here
Figure 4-17. Piston Seal Installation
Controller Maintenance
Controller Part Replacement
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4
3
4
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