Routine Maintenance
8-5
Figure 8-4: Close up of vacuum/charging manifold and pump
8) Evacuate to 50 microns.
9) Isolate the vacuum pump and add 50 PSIG (3.4 bar / 340 kilopascal) of helium.
10) Vent the helium and repeat steps 8 & 9 at least once. Vent the helium and continue
to step 11.
11) Final evacuation should be to 25 microns.
12) Pressurize the line to the service access with the desired amount of helium pressure.
13) Slowly open the service valve to add helium to the system. The final helium charge in
the system is specified in Section 5.
CAUTION
No more than 5 PSIG (.34 bar / 34 kilopascal) of gas should be added per minute to
prevent internal oil contamination to the system. If such contamination occurs, factory
service will be required.
14) After adding the helium, close the service valve and remove the service Aeroquip
from the service access.
Service
Aeroquips
LinetoHelium
Tank
Vacuum
SendingUnit
VacuumValve
ChargingLines
VentValve
ReliefValve
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