Table 1-1. Function of Components and Assemblies of Unit Subassembly

TM 55-4920-405-13&P

Fig. 1-3

Function

Description

Index No.

Low pressure filter assembly

Filters micronic particles from hydraulic fluid of test

stand and system under test

Control panels

Contain controls needed to start engine, gages for

2,10

monitoring operations, and hydraulic valves and con-

trols needed to regulate hydraulic fluid and volume

High pressure filter

Located between hydraulic pump and flow control valve

to filter micronic particles from hydraulic pump

fluid

Provides required hydraulic fluid delivery

Hydraulic pump

Limits maximum pressure

in hydraulic system return

Low pressure relief valve

line

Contains sensing bulb for

fluid temperature indicator,

Manifold assembly

and thermos witch to shut

off engine when fluid

temperature becomes too

high

Gas tank

Holds gasoline to run engine

Hydraulic reservoir

Holds hydraulic fluid for components or systems under

test

Absorbs sudden high increases in hydraulic fluid pres-

Pressure pulsation dampener

sure so that high pressure gage needle will not peg

or indicate small erratic changes in fluid pressure

Trailer frame

Provides mounting for components and assemblies of

test stand

Provides DC power to start engine of test stand

Battery

Drives high pressure hydraulic pump and alternator

Gasoline engine

for battery charging_---- ------ ----- --. ----

circuit

Allows test stand to be towed by vehicle for relocation

Trailer running gear

to another operating site

Handbrake lever assembly

Sets test stand brake to prevent rolling of test stand

Table 1-2. Function of Cabinet Assembly Components

Fig. 1-4

Function

Description

Index No.

Provides access to storage space for hose assemblies

Hose storage door

Provide access to controls needed for operation of

2,7

Control panel access doors

test stand

Provide ventilation for engine when it is running

Engine ventilation doors

Provides access to engine for maintenance, and engine

Engine access and ventilation

ventilation during operation of test stand

door

Provides access to components of hydraulic system

Hydraulic system access door

for maintenance

Provides access to hydraulic fluid reservoir

Reservoir access door

Provides access to battery and engine for maintenance,

Battery and engine access and

and engine ventilation during operation of test stand

ventilation door

1-7