TM-9-2320-280-10

TRUCK, UTILITY: M998 SERIES

OPERATOR’S MANUAL

JANUARY 1996

TM-9-2320-280-10 - Page 395 of 405

6. Transmission.

CAUTION

• Do not overfill trans-

mission. The fluid level

rises as the fluid tem-

perature increases. There-

fore, do not check level

before the transmission has

reached normal operating

temperature. The safe

operating level is within

the crosshatch marks on

the dipstick. Overfilling

will result in damage to

transmission.

• Use Dexron

®

II (3L80) or

D e x r o n

®

III (4L80-E) for

filling transmission. F a i l u r e

to use Dexron

®

II or

D e x r o n

®

III will cause

damage to transmission.

Check and fill transmission to

proper level weekly. Operate trans-

mission through all operating

ranges to fill cavities and fluid

passages. With vehicle positioned on

level ground, allow engine to idle,

shift transmission to neutral, and

apply parking brake. Check fluid

level on dipstick. It should register

within the crosshatch marks under

the conditions stated above. On

vehicles equipped for deep water

fording, the dipstick has a seal

which fits into the opening of the

dipstick tube. The dipstick handle

must be turned counterclockwise to

be released before dipstick is

withdrawn. Turn dipstick handle

clockwise to seat after installing

dipstick. Have fluid changed every

12,000 mi (19,308 km), or biennially,

whichever occurs first.

7. Crankcase Oil Level.

CAUTION

• There are two marks on the

dipstick: “FULL” and “ADD 1

Q T.” The quantity of oil

required to raise

the oil level

from “ADD 1 QT” mark to

“FULL” mark is 1 qt (0.9 L). Do

not

overfill

crankcase.

Overfilling will result in

damage to engine.

NOTE

• If oil level is above “FULL,”

it may be due to oil cooler

drain back. Operate the

engine for one minute, shut

down, wait one minute,

then recheck oil level.

• Oil is added to c r a n k c a s e

through fill tube which is

located on top of engine.

Check crankcase oil level daily.

Start engine and visually check for

oil leaks at drain plug and oil filter.

Stop engine and wait approximately

one minute for oil to drain back into

oil pan, then

recheck oil level with

dipstick. On vehicles equipped for

deep water fording, the dipstick has

a seal which fits into the opening of

the dipstick tube. The dipstick

handle must be turned counter-

clockwise to be released before

dipstick is withdrawn. Turn handle

clockwise to seat after installing

dipstick. Have oil changed every

3,000 mi (4,827 km), or semiannually,

whichever occurs first.

NOTES

G-16

Change 1

TM 9-2320-280-10