Table 2-2. Function of Startup Panel Controls

TM 55-4920-405-13&P

Table 2-1. Function of Main Panel Controls and Instrumentation - Continued

Fig. 2-1

Function

Description

Index No.

Provides means for directing pump output back to suction

HIGH PRESS BYPASS VALVE

return; used with HIGH PRESS RELIEF VALVE and

control

PRESSURE COMPENSATOR to set up fluid flow; dumps

pressure

Lights when low pressure filter differential fluid pres-

L P P indicator

sure reaches 10 PSI, thereby indicating need to replace

filter element

Allows SUCTION PRESSURE GAGE to measure pressure

SUCTION PRESSURE

drop across low-pressure filter; in FILTER-OUT posi-

FILTER-OUT control

tion, gage measures pressure at low pressure filter

output; in FILTER IN position, gage measure pressure

at low pressure filter inlet; in CLOSED position, gage

is shut off

When closed, shuts off fluid to FLUID PRESSURE GAGE

FLUID PRESS GAGE SHUT-

while external gage is connected to HP GAGE CAL

OFF valve

PORT for calibration; make sure this valve is open

during normal operation of test stand

Table 2-2. Function of Startup Panel Controls

Fig. 2-2

Function

Description

Index No.

When pulled out, enriches engine fuel mixture for starting

CHOKE control

engine

In OFF position, engine magneto is grounded; in ON

IGNITION SWITCH

position, magneto is ungrounded and 12 volt DC is applied

to electrical circuits

THROTTLE control

Push-pull, twist-to-lock control that sets engine speed

governor for desired engine speed

FUSE 10A

Protects electrical circuits from overloads and short

circuits

Momentary on type; when held in pu position, starter

STARTER switch

solenoid is energized, thereby applying 12 volts DC

momentarily to starter, which starts engine

2-5