Maintenance
7. Adjust the regulator to the required equalization pressure. See the Specifications section.
Slowly open the valve on the charge and vent tool. Charge the system with helium gas to
the equalization pressure.
8. Close the valves on the charge and vent tool and on the gas cylinder.
9. Disconnect the charge line from the charge and vent tool. Using two wrenches,
remove the charge and vent tool. Store the charge line to keep it clean.
10. Leak check the Aeroquip couplings using the Leak Check procedure in this manual
This completes the charging procedure.
Venting Procedure to Adjust the Equalization Pressure
NOTE
This venting procedure is not to be used for gas cleanup of the compressor.
To vent helium gas from the system:
1. Stop the compressor.
2. Be sure the valve on the charge and vent tool, P/N 267191A, is closed. Using two
wrenches, install this tool on the 4M Aeroquip helium charge port.
3. Slowly open the valve on the charge and vent tool. Vent the system until the required
equalization pressure is attained. See the Specifications section. Close the valve on the
tool.
4. Using two wrenches, remove the charge and vent tool from the compressor.
This completes the venting procedure to adjust the equalization pressure.
Gas Cleanup
Tools required: 2 adapter fittings with valve, 8F Aeroquip, 255919B2.
Open-end wrenches, 1", 1 1/8" and 1 3/16".
Helium gas cylinder with pressure regulator and charge line.
If the equalization pressure shown by the compressor’s pressure gauge is less than 1.4 bar
(20 psig), gas cleanup of the compressor is required. Look for and repair helium leaks. Perform
gas cleanup.
If system components are connected and the equalization pressure of the system is less than
1.4 bar (20 psig), check for leaks. Repair leaks. Perform gas cleanup of the system.
PREVENT EQUIPMENT DAMAGE. Never pull a vacuum on the compressor or
on the cold head. The motors will short circuit if started.
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