operator to quickly and accurately pick up a
(3) To raise the boom, engage boom hoist jaw
load, raise and swing it into position, and
clutch, then engage the boom hoist safety
correctly place it where desired.
pawl by pulling the boom hoist safety pawl
(9) Lower the load to the ground.
(4) Pull the boom hoist lever towards the rear
(10) Engage the cab lock with the cab lock lever
of the cab to raise the boom. When the
boom has obtained the desired height, push
(11) Place the boom hoist safety pawl lever in
the boom hoist lever to the neutral-position.
the engaged position by pulling backward.
(5) To lower the boom, raise it slightly as
(12) Disengage the engine clutch by pushing
instructed above and push the safety pawl
lever forward to release the safety pawl on
the boom hoist drum. Push the boom hoist
21. Moving Crane With Boom Installed
lever forward to lower the boom.
a. No dismantling for movement is necessary on the
(6) When the boom has obtained the desired
crane-shovel. Stow and secure all parts and equipment.
height, pull the boom hoist lever back to the
neutral position and engage the safety pawl
Normally, the crane-shovel will be
by pulling the safety pawl lever back.
driven short distance to a new
(7) Operate the crane as instructed in figure
b. For movement other than short distances,
(8) Spotting the load requires accurate control
position the crane-shovel on a flatcar as illustrated in
of the hoist and swing movements to locate
the load at the exact spot without hunting or
overshooting. In event that it is necessary
When transporting the crane, keep the
to relocate the carrier, be sure that the
counterweight to the rear of the carrier
swing lock lever is engaged. Practice with
and the boom in its rack.
the crane controls will soon enable the
Section V. OPERATION UNDER UNUSUAL CONDITIONS
Instructions necessary for the proper functioning of the crane in extreme cold, heat, dusty or
sandy area, under rainy or humid conditions, in saltwater areas, and at high altitudes are given in
22. Operation in Extreme Cold (Below 0F.)
a. Cooling System.
(1) Refer to the Lubrication Order (LO 5-3810-
(1) Inspect the cooling system for leaks. Make
109 F. The carrier and the crane are
sure all clamps are tight and draincocks are
equipped with winterization heaters. The
closed. Protect the cooling system from
heaters should be operated to heat the
freezing by adding the amounts of
engine oil to near operating temperature
approved ethyleneglycol type antifreeze;
before engines are started.
procure the required antifreeze through
organizational maintenance and fill radiator.
(2) Check the oil in all cases, frequently, as oil
consumption may increase.
(2) Keep the radiator shutters adjusted to
maintain normal coolant temperature.
(3) Change oil more frequently than usual