TM-9-2320-272-24-1

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

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4

JUNE 1998

TM-9-2320-272-24-1 - Page 624 of 1015

3-90. SPEEDOMETER

TM 9-2320-272-24-1

NOTE

Pull driveshaft core out from driveshaft conduit 1-1/2 in. (38 mm)

to gain access to retaining washer.

13.

Remove retaining washer (3) and driveshaft core (1) from driveshaft (2).

1.

Inspect driveshaft (2) for cracks. Replace if cracked.

2.

Inspect driveshaft core (1) for breaks. Replace if broken.

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

NOTE

Apply thin coat of GM grease to driveshaft core.

Install driveshaft core (1) and retaining washer (3) on driveshaft (2).

Install grommet (10) with speedometer driveshaft (2) on firewall (9).

Connect shaft nut (21) to transfer case input gear cover (22).

Install speedometer driveshaft (2) and clamp (19) on transfer case (18) with screw (20). Tighten

screw (20) 40-65 lb-ft (54-88 N•m).

Install bracket (13) on engine bell housing (15) with screw (14). Tighten screw (14) 25-31 lb-ft

(34-42 N•m).

Install speedometer driveshaft (2), clamps (11) and (16) on bracket (13) with screw (17) and nut (12).

Install five new tiedown straps (23) on speedometer driveshaft (2).

Connect shaft nut (24) to speedometer (25).

Install instrument cluster (27) on instrument panel (26) with eight screws (28).

Install two clamps (5), speedometer driveshaft (2), clamp (6), washer (7), and screw (8) on air intake

manifold (4).

3-260