TM-9-2320-272-24-3

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 3 OF 4

JUNE 1998

TM-9-2320-272-24-3 - Page 140 of 799

TM 9-2320-272-24-3

4-66. FRONT WIRING HARNESS (M939/A1) REPLACEMENT (Contd)

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Remove eight screws (3) from instrument cluster (1) and pull cluster (1) away from instrument

panel (2).

Remove screw (7), retainer nut (9), and clamp (8) from heater assembly (4) in right side of engine

compartment.

Remove cotter pin (10) from fresh air control cable (6). Discard cotter pin (10).

Remove fresh air control cable (6) and spring nut (5) from heater (4). Discard spring nut (5).

From behind instrument cluster (1), disconnect tachometer driveshaft (18).

Disconnect speedometer driveshaft (17) from instrument cluster (1).

Disconnect air tube (11) from instrument cluster (1).

Disconnect wire (20), two wires (21), and wire (22) from battery switch (19).

Disconnect wires (23), (24), and (25) from starter switch (26).

Disconnect wire (31) from wire (32) on instrument cluster wire assembly (14).

Disconnect five wires (16) from five instrument cluster lights (15).

Disconnect wire (27) from fuel gauge (28).

Disconnect wire (30) from oil pressure gauge (29).

Disconnect wire (33) from transmission oil temperature gauge (36).

Disconnect wire (13) from engine temperature gauge (12).

Disconnect two wires (34) from spring brake pressure switch (36).

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