TM-9-2350-358-BD

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A6

TECHNICAL MANUAL; OPERATOR’S, UNIT, AND DIRECT SUPPORT SUPPORT MAINTENANCE

MARCH 1994

TM-9-2350-358-BD - Page 178 of 343

TM 9-2350-358-BD

7-15.

RELAY, HYDRAULIC PUMP MOTOR

General Information:

Hydraulic pump maintains a predetermined hydraulic pressure.

If the hydraulic pump falls, the hydraulic pressure will fall,

rendering all hydraulic equipment unusable.

Limitations:

When the hydraulic relay is bypassed, the hydraulic fluid level detector and hydraulic motor thermal switch are no

longer effective.

Personnel/Time Required:

•

1 soldier

•

0.5 hour

Materials/Tools:

Tape, insulation electrical (item 63, Appendix C)

References:

TM 9-2350-314-20-2-1

CAUTION

With hydraulic relay bypassed low hydraulic fluid levels and

overheating of hydraulic pump will not turn hydraulic motor off.

Hydraulic fluid level must be frequently monitored to insure

adequate hydraulic fluid level in the hydraulic reservoir, and

temperature of hydraulic pump must be periodically monitored for

overheating.

Failure to heed this caution may cause damage to, or

destruction of the hydraulic pump motor.

Procedural Steps:

1.

Gain access to the hydraulic relay.

7-18