TM 1-1740-204-13&P
2-8 LEAK CHECK AND CONFIDENCE TEST PROCEDURE (See Fig. 2-1)
WARNING
Depressurize and shut down the high pressure nitrogen servicing cart per paragraph 2-7 prior to
any repair action including the tightening of fittings.
a.
Setup the cart per paragraph 2-5.
b.
Remove tire filling hose assembly from hose cleats.
c.
Place the quick disconnect plug end of the tire filling hose assembly into the connector, C4, labeled TIRE
FILLING OUTPUT. Couple the quick disconnect socket side to the connector, C3, labeled SHOP AIR INLET.
d.
Slowly open valve(s) located on the nitrogen tanks. The tank pressure gauge, G1, and pump outlet pressure
gauge, G3, on both regulator assemblies will show the tank pressure.
e.
Slowly turn low pressure regulator, R1, T-handle clockwise until the regulated low pressure gauge, G2, reads 150
psi. Slowly turn the high pressure regulator, R2, T-handle fully clockwise.
f.
Remove the high pressure charging hose from hose cleats. Open the high pressure shutoff valve, V3.
NOTE
The high pressure charging hose assembly consists of two hose assemblies connected by a
shut-off valve.
g.
The system is now pressurized with nitrogen tank pressure. Soap bubble test all pressure connections.
h.
If leaks are found, depressurize and shut down the high pressure nitrogen cart using the procedure of paragraph
2-7. Refer to the applicable maintenance procedure in Chapters 3 or 4. If no leaks are found, continue.
i.
Turn the T-handle of the low pressure regulator, R1, counter clockwise until it spins freely. Disconnect the tire
filling hose from the mating connectors, C3 and C4.
j.
Open the pump drive valve, VI. Slowly turn the T-handle of the low pressure regulator, R1, clockwise until the
booster pump cycles and charges the pump outlet pressure gauge, G3, to read approx. 3750 psi. Do not charge
the pump output pressure higher than 3900 psi or the high pressure relief valve, SV2, may open.
k.
The system is now pressurized with booster pump output pressure. Soap bubble test all pressure connections
with soap solution (D8).
I.
If leaks are found, depressurize and shut down the high pressure nitrogen cart using the procedure of paragraph
2-7. Tighten loose fittings and reapply Teflon tape or sealant on pipe threads as required. If a component leaks,
refer to the applicable maintenance procedure in Chapters 3 or 4 for replacement.
m.
If no leaks are found, depressurize and shut down the system per paragraph 2-7. This concludes the leak check
and confidence test procedure.
2-10
