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Chapter 3. MAINTENANCE INSTRUCTIONS, AVUM, AVIM
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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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Preliminary lubrication.
TM 55-4920-442-13 & P
c. Open the control and instrument panel access door. Inspect all gages, indicators and controls for evidence of
shipping damage. Check that all parts are securely mounted. Check that all manually operated switches and controls
operate freely.
d. Open access doors. Inspect the plumbing installation for damaged tube assemblies or fittings. Check that all
fittings are securely connected.
e. Carefully inspect the electrical wiring for broken wires or frayed insulation. Check that all electrical connections
are secure.  Be sure all ground circuits within the unit are intact and that equipment is properly grounded before
energizing.
f. Inspect the motor installation for evidence of shipping damage.
Check that the motor mounting bolts are
securely tightened.
g. Inspect oil reservoir for evidence of physical damage in shipment. Check that the gage sensor is securely
mounted in the oil reservoir. Check that the electrical wiring to the sensing units is not damaged. Check the fluid system
carefully for evidence of leakage.
h. Check tires for proper inflated pressure. Normal tire pressure should be 40 5 pounds with tires cold. Inspect
tire treads and casings for cuts or abrasions and remove any imbedded objects from treads.
i. Check the tow bar and steering assemblies. Make certain that tie rods have not been bent or damaged and that
the steering apparatus swings freely.
j. Check hand brake assembly by setting the hand brake and testing rear wheels for braking action.
k. Inspect the test stand trailer and cabinet for any damage, making certain that all bolts and screws are secured.
Check doors and door latches for proper closing and locking.
l. Connect 175 amp, 230 volt or 87 amp, 460 volt power source to input terminals of hydraulic test stand with the
No. AWG 00,4 conductor cable provided. Terminals are located in the upper left hand corner of electrical components
panel. Hydraulic pump motor, fill pump, fan motor and control transformer are factory connected for 230 volt, 60 hertz
(see figure 1-5 for connection diagrams).
3-8. Servicing hydraulic system. To service the hydraulic system for use, proceed as outlined in the following steps.
a. If the hydraulic fluid reservoir (figure 1-2) has been filled with a preservative fluid for shipment, drain the
reservoir by opening the reservoir drain plug in the bottom of the reservoir. Make certain drain plug is closed after
reservoir has been completely drained.
b. Drain the preservative fluid (if necessary) from the hydraulic system at filter drain for the low pressure filter
(figure 1-2). When completely drained, replace drain plug.
3-2

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