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Chapter 2. OPERATING INSTRUCTIONS - TM-55-4920-442-13-P0021
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TM-55-4920-442-13-P Aircraft Hydraulic System Test Stand Trailer Mounted Type MK-1 Manual
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The test stand is now full and air free.
TM 55-4920-442-13&P
WARNING
Be sure all ground circuits within the unit are in tact and that equipment is properly grounded
before energizing.
b. Set circuit breaker (1CB, Figure C-7) momentarily to on position to check fluid level.
NOTE
This step is necessary to energize fluid gage.
c. Observe the hydraulic oil gage and add fluid conforming to MIL-H-83282 until gage indicates 3/4 to 7/8 full.
CAUTION
Never operate the test stand if the hydraulic fluid reservoir is less than 1/2 full.
System
damage could result. Replenish as required.
d. Inspect piping and fittings for obvious leaks.
e. Close and secure all doors except that giving access to the control panel and electrical components panel.
2-6. Pre-operation control settings. Set the operating controls as listed in table 2-2.
2-7. Pre-operation fill and bleed procedure. With the controls set as specified in paragraph 2-6, proceed as follows:
a. Set circuit breakers (1CB, 2CB, and 3CB) to on position to set up hydraulic pump, fill pump and fan circuits for
operation (see figure C-7).
NOTE
The fill system relief valve has been pre-set to actuate at 110 PSIG.
b. Turn 4-way valve to aircraft reservoir position.
c. Make certain flow control valve is closed.
d. Set fill pump switch to on.
e. Press the bleed valve actuating button intermittently to bleed air from the system. Observe fluid flow in sight
tube. Continue to actuate bleed valve until system is purged of air.
f. When system is free of air, set fill pump switch to off.
2-2

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