TM-9-2320-428-10
TRUCK, CARGO, 8X8, M977
TECHNICAL MANUAL; OPERATOR'S MANUAL
JUNE 2009
TM-9-2320-428-10 - Page 318 of 1072
OPERATE ENGINE BRAKE - Continued
TRAILER
AIR SUPLY
NOT FOR PARKING
MIDLAND
AUST
PUSHT
OSUPPLY
4
5
6
1
3
2
7
Figure 1.
2.
Set JACOBS® ENGINE BRAKE ON/OFF switch (2) to ON. JACOBS® ENGINE
BRAKE indicator light (3) will come on.
3.
Lift foot off throttle pedal (4). Engine brake will automatically slow vehicle.
4.
If too much braking occurs, push in button (5) and set transmission range selector (6)
to a higher range.
5.
If more braking is required, set JACOBS® ENGINE BRAKE HIGH/LOW switch (1) to
HIGH.
NOTE
Engine brake operates best when engine speed is between 1650 and
2100 rpm.
6.
Check that tachometer (7) reads between 1650 and 2100 rpm whenever engine brake
is used.
END OF TASK
END OF WORK PACKAGE
TM 9-2320-428-10
0049
0049-2
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