TM-9-2320-280-20-1

TRUCK, UTILITY: M998 SERIES

TECHNICAL MANUAL; UNIT MAINTENANCE; VOLUME 1 OF 3

JANUARY 1996

TM-9-2320-280-20-1 - Page 109 of 888

Table 2-1. Unit Level Preventive Maintenance Checks and Services HMMWV (Cont'd)

ITEM

NO.

INTERVAL

ITEM TO BE

INSPECTED

PROCEDURES

16

Semi-

Driveline

f.

M998, M998A1, and M1121 series

f.

Lube level not within

Annual

Compo-

vehicles – Check differential lubricant

1/4 inch (6.4 mm) of fill

nents

level semiannually or every (3,000 miles) plug opening when cold

(Cont’d)

(4,830 km). M998A2 and M1123 series

or to plug level when hot.

vehicles – Change differential lubricant

semiannually or every 3,000 miles

(4,830 km). Differential level should be

within 1/4 inch (6.4 mm) of fill plug

opening when

lubricant is cold or to plug

level when hot.

g.

Inspect U-joints for damage, free

g.

U-joint is damaged,

play, and missing or unserviceable

unserviceable, or missing

lubrication fittings.

lubrication fitting.

h.

Tighten front prop shaft mounting

h.

Loose, missing, or

capscrews to 13-18 lb-ft (18-24 N

•

m)

broken capscrews.

and center support capscrews to 60 lb-ft

(81 N

•

m). Tighten rear prop shaft

capscrews to 13-18 lb-ft (18-24 N

•

m)

and tighten U-bolt nuts to 21 lb-ft

(29 N

•

m).

i.

Inspect rubber block and center

i.

Rubber block or center

support bearing for wear and wobble in

support bearing is worn or

propeller shaft.

propeller shaft wobbles.

TM 9-2320-280-20-1

2-18

Change 2

NOT FULLY MISSION

CAPABLE IF:

CENTER

SUPPORT

BEARING

RUBBER

BLOCK