Fluke Calibration 4322-SYS-NAVAIR, Руководство по обслуживанию

Страница: 85 / 186

Controller Maintenance
Controller Part Replacement
4
4-33
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.
1
2
Optical switch removed for clarity and is
not necessary to remove from bracket
4
3
5
View of Crank Shaft
6
8
Alignment
mark here
Orientation
mark
7
hbx102.eps
Figure 4-17. Piston Seal Installation
14. Reconnect the connecting rod (

) to the crank (

) in the same screw hole used