Section III: OPERATING INSTRUCTIONS

TM 55-4920-335-14

SECTION III

OPERATING INSTRUCTIONS

3-1. PREPARATION FOR STARTING. Prepare the Test

e. Remove protective caps from pressure and suction

Stand for starting and operation as follows:

hose connections (6, figure 1-2). Remove protective caps from

connection hoses. Connect hose from pressure outlet port (8,

a. Perform the daily ins pection and services outlined in

figure 1-2) (3/4 inch) or pressure outlet port (9) (1/2 inch) to

Table IV.

corresponding outlet on aircraft to be tested. Connect second

hose to suction port (7) and to corresponding outlet on aircraft

b. Maneuver the Test Stand to a position that is suitable

to be tested.

for hose connection to the aircraft system.

3-2. CONTROLS AND INSTRUMENTS. Table II lists,

c. When Test Stand is in position, apply hand brake

describes, and briefly explains the function of the operating

lever (11, figure 1-1) by pushing downward. Place tow bar in

controls and instruments located on the control panel (figure

upright position.

3-1). Table III lists, describes, and briefly explains the function

of the pump controls located in the opening beneath the control

Open control panel access door (6, figure 1-1).

panel.

Table II. Control Panel Controls and Instruments

Fig. 3-1

Index No.

Title

Description

Function

Reservoir Shutoff Valve

1 in. gate valve

Controls fluid flow from reservoir into hydraulic system.

Ammeter

30-0-30 range

Indicates generator output and/or ampere load on battery.

HP Gage Shutoff

Needle valve 1/4 in.

Isolates high pressure gage.

Gage Test Fitting

Union and cap

Testing high pressure gage.

HP Filter Indicator

Press-to-test

Indicates clogged HP filter when lighted.

indicator light - red

High Pressure Gage

0 to 6000 psi

Indicates hydraulic system pressure.

Flow Indicator

Variable indicator

Indicates hydraulic pump delivery from 0 to 10 gpm.

Fluid Level Indicator

E - 1/2 - F

Indicates fluid level in hydraulic reservoir.

Low Pressure Gage

30" and 0 to 150

Indicates vacuum and/or pressure in hydraulic suction system.

psi

LP Filter Indicator

Press-to-test

Indicates clogged LP filter when lighted.

indicator light - red

-20oF to 200F

Fluid Temperature Gage

Indicates temperature of fluid in hydraulic system.

Pressure Selector Valve

3-way valve

Connects filter pressure gage to manifold and pump suction inlet to

measure across LP filter.

Gage Test Fitting

Union and cap

Testing low pressure gage.

3-1