TM 5-3810-231-12
CHAPTER 4.
WINTERIZATION EQUIPMENT
Section I. OPERATING INSTRUCTIONS
151. General
(2) Move control switch to either ON position.
When ON-LO is u s e d, heat output is
considerably Iess than at ON-HI position.
a. The winterization equipment installed on
Harnischfeger Model 1125 Crane is designed to permit
(3) Preheating of combustion chamber lasts for
operation at low ambient temperatures, by directing
approximately one minute before ignition cycle
heated air to cab and components, and circulation of
begins.
Approximately one minute after
heated engine coolant thru engine lubrication oil by
ignition, the indicator lamp will glow an d heater
means of a special coil inserted in oil pan.
will operate.
b. Heated air for cab and components i s supplied
c. Battery box heating is a controlled procedure as
by two fuel fired fresh air heaters, (each rated at 60,000
outlined below.
Btu (British thermal units), and all necessary ductwork
(1) When engine is stopped and batteries are to be
for distribution.
preheated, No. 1 thermostat in battery box
c. Heat for engine coolant and lubricating oil is
must be bypassed. This is necessary because
furnished by a 60,000 BTU fuel fired coolant heater,
heating system was designed to raise electrolyte
circulating pump, fittings, hose, and lines necessary to
temperature 50 F. in one hour, and keep
circulate the engine coolant liquid.
battery temperature between 40 F. and 1000
F. during engine operation. To accomplish this
requires that battery box be exposed to heated
152. Cab and Component Heaters
air for periods up to one hour.
Without
bypassing No. 1 thermostat (which is set at 60
a. The two cab and component heaters are
o
F. to 80 F.) exposure for one hour would
installed on right hand side of crane upper section (fig.
interrupt the preheat cycle.
used primarily for cab heating and defrosting. Heater
(2) To bypass No. 1 thermostat, an oil pressure
installed at rear of cab right side provides heat for propel
switch is provided. This switch is ON when
clutch, engine clutch housing, torque converter, and
engine is stopped, and disconnects No. 1
battery box.
thermostat from circuit. When engine is started,
the oil pressure switch breaks circuit, throwing
b. Before starting heaters, check heater fuel
No. 2 thermostat out, and No. 1 thermostat
pumps (para 158) and assure that fuel line valves are
controls the heater.
open.
(3) With engine stopped, and preheating cycle on
(1) Depress lens of indicator lamp (fig. 92) to test
too long, No. 2 thermostat (set at 250 F.), will
for power availability. If lamp fails to light when
shut
depressed, operate reset switch and repeat the
test. Replace a burned out I a m p (para 160).
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