TM-9-2350-277-20-1

CARRIER M113A3, M577A3, M1059A3, M1064A3, M1068A3 AND M58

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL VOLUME 1 OF 6

TM-9-2350-277-20-1 - Page 148 of 855

TM 9-2350-277-20-1

ENGINE OVERHEATS (NEW VSFD CONFIGURATION) — Continued

0014 01

7Y

1.

Engage variable speed fan drive manual override switch.

See TM 9-2350-277-10.

2.

Observe ventilating fan speed while helper (H) raises the

engine RPM to a high idle (1500 RPM) and allows the

engine to return back to idle.

3.

Does speed stay the same?

7YN

1.

Replace variable speed fan

drive manual override switch

(WP 0231 01).

2.

Verify no faults found.

8Y

1.

Observe rotation of ventilating fan (1) and generator drive

pulleys (2) on drive unit.

2.

Is fan pulley rotating as fast as the generator pulley?

8YN

1.

Disengage variable speed fan drive

manual override switch.

2.

Replace variable speed fan drive

(WP 0249 01).

3.

Verify no faults found.

001401-3

Change 5