TM-9-2320-279-10-1

M977 SERIES, 8x8 HEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT)

OPERATOR’S MANUAL VOLUME 1 OF 2

DECEMBER 1998
CHANGE 5
TM-9-2320-279-10-1

  TM-9-2320-279-10-1 - Page 68 of 773

TM 9-2320-279-10-1
Controls and Indicators (Cont)
Legend for Figure 2-6. Heater Compartment Controls and Indicators.
Key
1
2
3
Control or Indicator
Trailer Handbrake Control
4
JACOBS
®
ENGINE BRAKE
ON-OFF Switch
JACOBS
®
ENGINE BRAKE
Indicator
JACOBS
®
ENGINE BRAKE
HIGH-LOW Switch
5
AIR Control
6
FAN Control
7
HEAT Control
8
DEFROST Control
9
PTO ENGAGE Indicator
10
11
CRANE OUTRIGGER
EXTENDED Indicator
PTO ENGAGE Control
12
Utility Outlet
13
Light Control
14
WASHER Control
15
16
17
WIPER Control (Right)
WIPER Control (Left)
WORK LIGHT Switch
(M1977-CBT, M983 and
M984E1 only)
DOMELIGHT Switch
Controls operation of right windshield wiper.
Controls operation of left windshield wiper.
18
19
Up position (on) turns cab domelight on. Down
position (off) turns cab domelight off.
Up position (on) turns clearance lamps on.
Down position (off) turns clearance lamps off.
CL LPS Switch
Function
Works the trailer brakes and is only used to
TEST the trailer brakes.
Supplies or shuts off electrical power to
JACOBS’ ENGINE BRAKE.
Lights (green) when JACOBS” ENGINE
BRAKE ON-OFF switch is in ON position.
Selects number of engine cylinders used for
engine braking action. HIGH position provides
maximum braking. LOW position provides less
engine braking.
Controls amount of outside air entering cab
through fresh air vent.
Controls speed of heater fan.
Controls amount of hot air entering cab.
Controls amount of hot air blown on windshield
Lights (red) when PTO ENGAGE control is in
ON position.
Lights (red) when outriggers are extended
(M977 and M985 only).
Supplies or shuts off electrical power to power
takeoff.
Supplies electrical power to operate beacon light
and work lamp.
lighting system.
Controls all electrical power to all parts of
Controls spray of cleaning fluid on
windshield.
Up (on) position turns on work lights. Down (off)
position turns work lights off.
Change 5
2-11


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