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 169 of 343
TM 9-2350-358-BD
7-7.
BRUSH, ELECTRIC, MOTOR/GENERATOR, WORN - CONTINUED
5.
Using a hacksaw or other suitable tool, open battery to expose carbon core.
6.
Clean and cut a piece of carbon core and shape to fit the brush holder.
7.
Insert the piece of carbon into the brush plate and position the loose end of the old brush wire between the carbon
and the retaining spring to ensure electrical continuity.
8.
Seat the brushes as follows:
a.
Cut a strip of abrasive paper slightly wider than the commutator surface.
b.
Tape the strip of abrasive paper over the commutator.
c.
Install the brush holder with piece of carbon core enclosed.
d.
Rotate the armature in the normal direction until the piece of carbon core face conforms to the armature
surface curvature.
e.
Remove the abrasive paper and blow the armature commutator area free of dust and grit.
9.
Reassemble generator and test for proper operation.
10.
Reinstall and align generator.
11.
Set MASTER power switch to ON.
12.
Record BDAR action taken.
When mission is complete, as soon as practical, repair the equipment/system using
standard maintenance procedures.
SECTION III.
SWITCHES, RELAYS, AND SENSORS
7-8.
GENERAL
Special switches, relays and a sensor which are used to apply power to activate a circuit or subsystem are covered in this
section.
7-9.
SWITCH, RELAY, OIL PRESSURE-ACTIVATED, AIR CLEANER AND
GENERATOR SYSTEM
General Information:
The air cleaner and generator system, oil pressure-activated relay switch is a safety interlock switch, which opens when oil
pressure drops below a SAFE level.
Under extreme conditions when system operation must be maintained regardless of
excessive wear and/or damage to the engine, the switch can be bypassed.
CAUTION
The oil pressure-activated interlock switch opens when oil pressure
drops below a predetermined SAFE level.
Bypassing the Interlock
switch allowing the engine to continue to run, will cause excessive
wear and eventual engine failure.
7-9
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