27. Operation at High Altitude
d. Electrical System. Make sure that all electrical
Operation at high altitude presents operational
leads are in good condition and not frayed, and that
problems due to lower atmospheric press sure and wide
insulation is not torn or broken. Repair any broken
temperature ranges. At altitudes above 5,000 feet it is
insulation as it may lead to a short in the electrical
necessary to adjust carburetors (paras. 86 and 93). Be
system.
sure the air cleaner is clean and free of obstructions.
e. Batteries. Check the batteries to make sure
Service the air cleaners frequently.
Maximum
they are full of water, that all connections are tight, and
performance can be maintained by carefully following
that the terminals are greased to prevent any corrosion.
the operator's daily preventative maintenance services
f. Lubrication. Keep parts thoroughly lubricated to
prevent entry of water into bearings and polished metal
Caution:
surfaces. Keep lifting cables lubricated as specified in
Check the units frequently for
LO 5-3810-227-15.
overheating of the engines in high-
altitude operation.
Section VI. OPERATION OF AUXILIARY MATERIEL USED IN
CONJUNCTION WITH THE CARRIER AND CRANE
30. Carrier Cab Heater (Winterized Units Only)
28. General
This section covers the description, operation, and
a. Description. The carrier cab fresh air heater (C,
maintenance of auxiliary equipment supplied for use with
the carrier and crane but not necessary for the basic
housing. For cold-weather operation the gas-fired fresh
functioning of the carrier and crane.
air heater provides the operator's cab and the battery box
29. Carrier Engine Heater (Winterized Units Only)
with heat.
b. Operation. Operate the carrier cab personnel
heater in the same manner as the carrier engine heater
the right front wheel. For cold-weather operation the gas-
fired, liquid heater provides the carrier engine with
31. Crane Engine Heater
sufficient heat to start normal function by heating and
circulating the liquid coolant in the cooling system. The
is mounted under the floor of the revolving superstructure
engine oil pan is also jacketed for heating by the liquid
at the right rear corner below the engine speed reducer.
coolant. An electric pump circulates the coolant during
For cold-weather operation the gas-fired liquid heater
the heating operation.
provides the crane engine with sufficient heat to start
normal function by heating and circulating the liquid
(1) Position control switch to ON-HI position.
coolant in the cooling system. The engine oil pan is also
jacketed for heating by the liquid coolant. An electric
Note.
pump circulates the coolant during the heating operation.
When heater has ignited and is
b. Heater Operation. Operate the crane engine
operating satisfactorily the indicator
heater in the same manner as the carrier heater (para.
lamp will glow.
(2) To stop heater, position the control switch
32. Crane Cab Heater
to OFF position. The indicator lamp will
remain on until heater has purged.
a. Description. The crane cab fresh air heater (E,
AGO 6819A
38
