Fluke Calibration 4322-SYS-NAVAIR, Service Manual

Page: 118 / 186

4322
Service Manual
5-24
Pressure Port Shaft and Seals
Use the following instructions and Figure 5-9 to replace the pressure port shaft (

) and
seals (

and

).
1. Remove the chassis and separate the chassis. See “Chassis” on page 5-11.
2. Remove pump cam assembly from the booster pump assembly housing. See “Pump
Cam” on page 5-14.
3. Disassemble the pump cam to gain access to the ICM shaft assembly. The pressure
port shaft can only be removed after all four of the ICM assemblies (

) have been
removed from the cylinder housing (

). See "ICM" on page 5-25.
4. After the ICM assemblies are all removed from the pump cam assembly, remove the
pressure port shaft (

) from the cylinder housing (

) by pushing it out.
5. Remove the two o-rings (

and

) and replace with new o-rings.

Caution
To prevent damage to the o-rings, lubricate the o-rings with
a small amount of Krytox RFE PFPE synthetic lubricant
before they are put on the pressure port shaft.
6. Position the pressure port shaft (

) with the four cylinder housing (

) ports. After
properly aligned, push the pressure port shaft (

) into the cylinder housing (

).
7. Reassemble the pump cam. See “Pump Cam Reassembly” on page 5-18.
8. Put the pump cam assembly into the booster pump assembly housing. See “Pump
Cam” on page 5-14.
9. Put the chassis together and put into the case. See “Chassis” on page 5-11.
2
3
4
5
7
6
1
hbx018.eps
Figure 5-9. ICM Shaft Assembly