TM-9-2320-272-10

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

TECHNICAL MANUAL; OPERATOR'S MANUAL

SEPTEMBER 2004

CHANGE 2

TM-9-2320-272-10 - Page 152 of 481

19

20

During

During

Gauges

CTIS

DRIVER

a.

Monitor all gauges during

operation (para. 2-3).

CAUTION

If oil pressure gauge reads 0

psi, stop engine. Failure to do

so may cause damage to inter-

nal engine components.

b.

Engine oil pressure gauge reads

less than 15 psi (103 kPa) on

M939/A1 series vehicles or 10 psi

(68 kPa) on M939A2 series vehicles

at idle; stop engine if pressure is zero.

DRIVER

CAUTION

Do not disconnect CTIS connec-

tor from ECU with power on.

Damage to ECU will result.

NOTE

CTIS reference applies only to

M939A2 series vehicles. If CTIS

is not operational, shutoff power

switch, disconnect electrical con-

nector from ECU, and complete

mission (para. 3-16).

While driving, check that amber

overspeed warning light (6) illu-

minates either in cross-country, sand,

or emergency modes (para. 2-14).

a.

Speedometer

is inoperative.

Notify Unit

Maintenance if

speedometer nee-

dle does not

move, jerks

unevenly during

sustained speeds,

or appears stuck.

b.

Engine oil

pressure is less

than 15 psi (103

kPa) on M939/A1

or 10 psi (68 kPa)

on M939A2 at idle.

Change 2

2-53

ITEM

NO.

INTERVAL

ITEM TO

CHECK/

SERVICE

NOT FULLY

MISSION

CAPABLE IF:

TM 9-2320-272-10

LOCATION

CREWMEMBER

PROCEDURE

Table 2-3. Preventive Maintenance Checks and Services for Models M939/A1/A2 (Contd).