FIGURE 1-2. INTERNAL COMPONENTS ASSEMBLY

TM 55-4920-442-13&P

FIGURE 1-2. INTERNAL COMPONENTS ASSEMBLY

Housing. Hinged doors on the sides of the cabinet permit access to all internal components. A hinged instrument panel

cover protects the controls when the test stand is not in use. The accessory box is located near the center of the unit on

the right side (figure 1-2).

Electric motor. Power for the test stand is supplied by a 60 horsepower, 230/460 volt, 3 phase, 60 hertz, 3535 RPM

electric motor (figure 1-2).

Electrical components panel. The circuit breaker and starter for the electric pump motor is located in the electrical

components panel (figure 1-1) at the front of the unit as are the circuit breakers and starters for the fill pump and cooling

fan.

Main hydraulic pump. The main hydraulic pump (figure 1-2) supplies fluid at high pressure for testing of a high pressure

pump section and integral boost pump section. The pump contains a manual compensator control (figure 1-1) for

varying the output pressure and volume control (figure 1-1) to regulate the output volume by changing the stroke length

of the pumping pistons. Change in piston stroke length is controlled by system pressure so that when the pump is

operating at a pressure less than the maximum setting of the compensator

1-4