TM 55-4920-428-13
n. Remove the CASE VENT LINE hose from the clamps. Remove the protective plug from the hose.
Place the hose in a graduated container.
o. Set the LOW PRESS REGULATOR to full INCREASE.
p. OPEN the CASE VENT LINE PRESS valve to full OPEN. Measure fluid flow. Adjust flow
limiter for a flow of 0.125 to 0.375 gpm.
NOTE
Oil flow for 15 seconds should be 0.013 to 0.094 gallons (4 to 12
ounces, 115 to 340 ml). Use a suitable container to catch oil.
q. Set the LOW PRESS REGULATOR to full DECREASE.
r. Set the CASE VENT LINE PRESS valve to the full CLOSE.
s. Tighten the nut on the flow limiter.
t. Turn the LOW PRESS REGULATOR toward INCREASE until the LOW PRESS gage indicates
300 psi.
u. Adjust valve VR6 by turning the stem ccw until the LOW PRESS gage indicates 250 psi.
v. Turn the LOW PRESS REGULATOR to full DECREASE, then to full INCREASE. The LOW
PRESS gage will read approximately 300 psi.
w. Adjust valve VR6 until the LOW PRESS gage indicates 300 psi.
x. Turn the LOW PRESS REGULATOR to full DECREASE, then to full INCREASE. The LOW
PRESS gage shall read 285 to 315 psi.
y. Tighten the nut on valve VR6.
z. If no other tests are required, perform the shutdown procedure. (Ref para 2-10. )
5-44. Proof Pressure Test.
The proof pressure test includes four separate test. They are performed at 4500 psi, 3750 psi, 3375 psi,
and 450 psi.
a. Test Setup.
(1)
(2)
(3)
(4)
(5)
Prepare the unit for use. (Ref para 2-6.)
Perform the self-test procedures. (Ref para 2-7.)
Remove the hydraulic unit panel from the case. (Ref para 5-22.)
Perform the fill and bleed procedures. (Ref para 2-8.)
Perform the high pressure self-test. (Ref para 2-9.)
5-15
