Maintenance
Repair or Replace a Coupling
Tools required: Open-end wrenches
This procedure applies to both male and female couplings on gas lines, compressor and cold
head.
1. Vent the charged component using the venting procedure in this manual or in the
Maintenance section of the appropriate manual.
2. If the coupling to be repaired has the venting adapter fitting attached, remove the adapter
fitting. Use two wrenches.
3. Use two wrenches to disconnect the coupling body from the adapter. Hold the adapter with
one wrench. Remove the coupling body with the other wrench. See Figure 7.
4. Push the valve assembly from the coupling body. It is not fastened. Examine all parts and
replace any that are damaged or replace the entire coupling half. See Figures 6 or 8.
Figure 7 Remove Coupling from Gas Line
Figure 8 Aeroquip Female Coupling Parts
5. Remove the O-ring from the gas line adapter.
6. Wipe the O-ring groove to be sure it is clean. Lightly coat a new O-ring with vacuum grease.
Install the O-ring in the gas line adapter.
7. Wipe the valve assembly with a clean, lint-free cloth. Insert the valve assembly into the
coupling body from the rear.
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