Section IV. OPERATION UNDER USUAL CONDITIONS
b. Make certain that all operating clutches are
a. The instructions in this section are
published for the information and guidance of personnel
disengaged and that all brakes are set. Engage the
re-sponsible for operation of the Model M320T truck
engine clutch, and listen for noisy operation.
c. Check the drum brakes by applying the
b. The operator must know how to perform
brakes and engaging the drum clutches very slightly,
every operation which can be performed with the Model
pulling against the set brakes. Any slip-ping of the
M320T truck crane. This section gives in-structions on
brakes will be felt and seen.
starting and stopping the Model M320T truck crane,
operation of the Model M320T truck crane, and on
d. If possible lift a maximum load a few inches
coordinating the basic mo-tions required to perform the
above the ground and make certain that it is held without
specific operations for which the equipment is designed.
drifting. See that adjustments are made, if necessary.
Since nearly every job presents a different problem, the
operator may have to vary given procedures to fit the
Release each drum brake in turn, and try
the drum clutches for smooth engagement and
During an operational test, make a check
Preparation for starting.
for leaks from fuel and oil lines, and from the cooling
g. Check all housings for overheating. Pro-
(1) Perform the preoperation services (para 2-
longed use of brakes or clutches, in excess of normal
operation, will cause overheating, lining wear, and
(2) Lubricate the truck crane as specified in
h. If there is evidence of equipment failure, re-
(3) Open the engine rain shutters.
port the condition to organizational maintenance.
2-19. Stopping the Crane
start the crane engine.
Place all control levers in the neutral
c. Engine Warmup. Start the engine and bring
it to a fast idle (approx 1,500 rpm) until normal operating
b. Make certain that the swing brake is set,
temperature is reached, and the oil pressure gauge
and that the load or hook block has been lowered to the
shows operating readings.
(1) At low temperatures, warmup time can be
c. Close the hand throttle. If possible, allow
reduced by keeping doors and openings in the cab
the engine to run at half speed or less for several
minutes before closing the throttle and stopping the
engine. This will allow the engine to cool down and will
(2) Watch the engine oil pressure gauge
prevent overheating due to localized residual heat.
closely. If the gauge does not indicate oil pressure within
15 seconds after starting the engine, stop the engine and
report this condition to organizational maintenance.
2-20. Crane Operation
a. General. The Model M320T truck crane,
with the crane boom installed and reeved for crane
operation, is capable of accurate placement of a load at
an elevation above or below the level of the crane cab.
2-18. Starting the Crane
load limits before starting operation.