Maintenance
8. Thoroughly degrease or apply Locquic Primer T (a degreasing agent) to the threads of the
adapter and to the internal threads of the coupling body. Do not get Primer T on the O-ring
or any of its seating surfaces.
9. Allow about 5 minutes for the primer to dry. Apply Loctite 242 to one full thread in the
coupling adapter. Use a needle applicator. Start at the second thread from the lead thread
and work toward the hexagon. Shake the Loctite before use.
10. Assemble the coupling body to the adapter. Use two wrenches. Hold the adapter with one
wrench and screw the two parts together. Tighten the size 8 Aeroquip coupling parts to
4.85 – 6.25 kg
f
m (35 – 45 ft. lbs.).
11. Allow at least a 6-hour curing period before applying gas pressure.
This completes the procedure for repairing or replacing a self-sealing coupling.
Charge Pressure Verification
Tools required: Tool Kit, P/N 268151A
Open-end wrenches
This procedure describes the process for checking and, if necessary, correcting the helium gas
charge pressure in refrigeration system gas lines.
PRESERVE YOUR WARRANTY. Any helium gas used in this procedure should
be of high purity. A purity level 0f 99.999% is required.
PREVENT EQUIPMENT DAMAGE. Keep the gas line couplings aligned when
making or breaking a coupling connection. Leaks can occur due to the weight of
the gas line or due to a sharp bend near the connection. Crimping from repeated
bending and repositioning can cause damage to gas lines.
AVOID INJURY. Use two wrenches when connecting or disconnecting a gas
line coupling to avoid loosening the wrong joint. Gas pressure can project the
coupling with enough force to cause injury.
1. Verify the pressure gauge tool [P/N 268150C2] has a minimum charge pressure of 20 psig.
2. If the charge pressure in the tool is too low, use the charge adapter tool [P/N 255919B2] to
charge the pressure gauge tool to 50 psig. If the pressure gauge tool is completely empty,
purge the pressure gauge tool with helium gas by “flushing through” with the exhaust valve
open. After purging, close the exhaust valve and establish the proper charge pressure in
the pressure gauge tool. Close the exhaust valve. Remove the charge adapter from the
pressure gauge tool.
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