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FIGURE 1-1. AIRCRAFT HYDRAULIC SYSTEM TEST STAND TRAILER MOUNTED TYPE MK-1
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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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FIGURE 1-2. INTERNAL COMPONENTS ASSEMBLY
TM 55-4920-442-13&P
SECTION II. EQUIPMENT DESCRIPTION AND DATA
1-8. Physical description. The test stand, as illustrated in figure 1-1 incorporates one hydraulic piping system, high
pressure pump driven by a 60 horsepower, 230/460 volt, 3 phase motor.
Operator's controls and instruments are located at the rear of this test stand and the electrical components panel is
located at the front of the unit. External hose connections are located on the right and left sides of the test stand near the
rear end, adjacent to the operator's control panel.
Hanging devices are located above the external hose connections to stow the hoses between tests.
1-9. Test stand capabilities. The stand is capable of supplying 0 to 30 GPM (gallons per minute) of hydraulic fluid
conforming to MIL-H-83282 at 3000 PSI (pounds per square inch), or 0 to 15 GPM at 5000 PSI. It is powered by an
electric motor.
Completely mobile, the test stand is mounted on a four wheel trailer which may be towed at speeds up to 20 miles per
hour over improved roads or surfaces; 10 MPH over rough terrain. The unit is air transportable, having been designed to
withstand the gravitational forces which might be encountered in normal flight. The stand weight is 3060 pounds (wet).
To familiarize using personnel with the equipment characteristics and physical makeup, a table of equipment data is
presented in table 1-1 and some of the major components are identified in figure 1-2.
1-10. Descriptive details. The stand operating components, including the control panel, are enclosed in a steel, weather
resistant housing, mounted on the four wheel trailer. Hand operated mechanical-type parking brakes which act upon the
rear wheels, hold the test stand in a fixed position, while in operation or when parked on a grade. The unit may be fork
lifted by inserting fork lift tines under the unit frame at marked channels. The major components and systems of the test
stand are as follows: trailer and running gear, housing, electric motor, fill pump and bleed system, hydraulic reservoir,
hydraulic filters, instruments and controls and the electrical system.
Trailer and running gear assembly. The trailer frame is of welded steel construction. The trailer rolls easily on four steel
wheels equipped with 6.00/6.90-9, 6 ply tires. Individual leaf springs for each wheel give the stand good cushioning
against road shocks and rough terrain, protecting the components of the test stand. A hinged towbar (figure 1-1) permits
ease of positioning of the test stand and towing. The front wheel steering is the conventional type with steering knuckles,
tie rods, and king pins. A hand lever (figure 1-1) sets the rear wheel brakes, holding the test stand in a fixed position
during test operation or in parking on a grade. Two tiedown rings (figure 1-1) are provided on both the front and rear of
the trailer frame to permit tie down of the test stand for storage or shipment. A pintle hook is provided for coupling and
towing the vehicle (figure 1-1).
1-3

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