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TM 1-4920-446-13 & P
SECTION II. EQUIPMENT -DESCRIPTION AND DATA
1-8. Physical Description.
a. The test stand (Figure 1-1) incorporates one hydraulic piping system and a high pressure pump. The pump is
driven by a 20 horsepower, 220/440 volt, 60 hertz, 3-phase motor.
NOTE
Left and right sides are determined standing at the towbar and facing the test stand.
b. Operator's controls and instruments are located at the right rear side of the test stand. The electrical components
box is located at the right front side of the unit. External hose connections are located on the rear frame. Two U-shaped
hangers are located on the cabinet front panel to stow the hydraulic hoses.
1-9. TEST STAND CAPABILITIES.
a. The stand is capable of supplying 0 to 10 gpm (gallons per minute) of hydraulic fluid at 3000 psi (pounds per
square inch), or 0 to 5 gpm at 5000 psi.
b. The test stand is mounted on a four wheel trailer and is completely mobile. It may be towed at speeds up to 20
mph over improved roads or surfaces; 10 MPH over rough terrain. The unit is air transportable. It has 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 pre-
sented 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 cabinet. The cabinet is mounted on the four wheel trailer. A hand operated mechanical parking brake
on the rear wheels holds the test stand stationary while in operation or when parked. The major components and sys-
tems of the test stand are: trailer and running gear, cabinet, electric motor, high pressure hydraulic pump, hydraulic res-
ervoir, hydraulic filters, instruments and controls, and the electrical system.
1-11. Trailer and Running Gear Assembly. The trailer frame is welded steel construction. The trailer rolls easily on four
steel wheels equipped with 6.00/6.90-9,6 ply tires. Transverse leaf springs and radius rods attached to the front and rear
axles cushion the stand against road shock and rough terrain, protecting the components of the test stand. A hinged
towbar permits ease of positioning of the test stand and towing. The towbar can be latched in the upright position. 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 stationary when not being moved. Tiedown rings (Figure 1-1) at each corner of
the trailer frame permit tiedown of the test stand for storage or shipment.
1-12. Housing. Two hinged doors on each side and one on the rear of the cabinet permit access to all internal compo-
nents. A two hinged cover protects the controls when the test stand is not in use. By releasing two catches on each side,
front and rear, the entire housing can be lifted off the chassis. A hinged access panel on top affords access to the hy-
draulic reservoir fill cap.
1-2
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