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TM 9-2320-279-20-1
Safety and Handling
CARE,
AND
HANDLING.
Recommendations. Significant
hazards
and
safety
a.  Significant  Hazards  and  Safety
recommendations are listed in Table 1-3.
1-3.
Significant
Hazards
and
Safety
Recommendations
Operating
Hazard
Safety Recommendation or Precaution
Condition
Do not drive vehicle while low air pressure warning
Abnormal
Low air pressure for
buzzer is sounding or red light is on.
brakes.
Ensure that outriggers are down on firm ground, side
Abnormal
Vehicle instability with
slope does not exceed five degrees, and crane is not
crane use.
overloaded.
No smoking, flames, or sparks within 50 feet (15 m).
Normal
Fire with M978 tanker.
Disconnect batteries for all electrical work.
Abnormal
T e s t tank automatic shutoff before bottom loading
Fuel spills with M978
tanker.
per procedure in instructions. Do not bypass
d e a d - m a n  controls.
Do not go between vehicles until vehicles are
Normal
C o n n e c t i n g towing devices.
stopped and brakes are set.
Normal
Refueling
vehicle.
Shut off engine and no smoking when filling tank.
Category of hazards as to whether or not they may be expected under normal or abnormal operating
conditions.
b. Cranes. Material handling cranes for models M977, M983, M984, M984E1, M985, and M985E1 all
h a v e overload shutdown and/or tilt warning (unstable) systems.
(1) On M983, M984, and M985E1 models a yellow caution light at fixed operator's station and an
audible warning signal alert the operator when an unstable crane condition occurs.
(2) M983, M984, and M985E1 have an overload shutdown system which senses lift cylinder pressure
to prevent overloading the crane. The system will shut down the crane to prevent hoisting, boom
extension, or boom raising when an overload condition exists. Load lowering and boom retraction
f u n c t i o n s will not be affected.
(3) When M977, M985, and M984E1 cranes are overloaded, the overload system will automatically
shut off power to telescope boom out, raise boom, or hoist load higher. The M977 and M984E1 overload
system, will also prevent lowering the boom. An overload condition can be corrected by lowering load to
ground or other supporting surface. All crane functions will be restored in approximately six seconds.
c.
Crane  Operating  Instruction  Plate  Locations:
(1) The crane operating instruction plates are located on the heater compartment cover in the cab,
and at each of the fixed operating stations.
(2) The outrigger leg signs are located on each of the outrigger cylinders.
(3) The load capacity signs are located at the main and auxiliary control panels and on M984E1, they
are also located on the wrecker body rear stowage box doors.
PRINCIPLES
OF
OPERATION.
Section
Ill.
Vehicle Operation Systems
(fig. 1-9) Power for the vehicle is provided by a diesel engine (1) which is
coupled directly to an automatic transmission (2). Power from the transmission is transferred to the
transfer case (3) and on to the front and rear axles (4) through a series of propeller shafts and universal
joints (5).

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