CONTROLS AND OPERATION
25. LEFT DRUM BRAKE SWITCH. Move this switch up (ON)
34. ENGINE FAULT WARNING LIGHT AND BUZZER. This
to lock the spring set left drum brake in the applied position.
warning device will be activated when the engine water
Pull the switch down (OFF) to release the brake.
temperature rises above normal or oil pressure drops below
26. RIGHT DRUM BRAKE SWITCH. Move this switch up
(ON) to lock the spring set right drum brake in the applied
position. Pull the switch down (OFF) to release the brake.
After start-up the warning device will remain acti-
vated until the engine oil pressure rises to the normal
27. PANEL LIGHT. This light illumlnates the side control
pressure. If oil pressure does not reach normal within
panel. The light IS controlled by switch (19).
15 seconds after start-up, shut down the engine
immediately and correct the cause of the low oil pres-
28. DOME LIGHT. This light is used to illuminate the oper-
ator's module. A switch located on the light is used to turn
the light on and off.
35. ENGINE OIL PRESSURE GAUGE. This gauge indicates
engine oil pressure. The gauge should read between 45 and
29. TOP WIPER SWITCH. Turn this switch clockwise, to the
70 psi during normal operation. There should be approxi-
detent, to operate the top window wiper at slow speed. Turn
mately 10 psi at low idle.
the switch past the detent to operate the wiper at high
36. ENGINE WATER TEMPERATURE GAUGE. This gauge
shows the temperature of the engine coolant. The gauge
should read between 185-200°F during normal operation.
30. WINDSHIELD WIPER SWITCH. Turn this switch clock-
wise to the detent, to operate the windshield wiper at slow
37. ENGINE VOLTMETER. The voltmeter measures the
speed. Turn the switch past the detent to operate the wiper
voltage produced by the alternator and indicates the condi-
at high speed.
tion of the battery. See Figure 2-3 for an explanation of the
31. HEATER CONTROL. Place this switch in the center
position to operate the fan at low speed. Place the switch in
38. FUEL GAUGE. This gauge shows the amount of fuel re-
the extreme right position to operate the fan at high speed.
maining in the fuel tank.
There is also a heater shutoff valve located on the engine.
39. TOROUE CONVERTER OIL TEMPERATURE GAUGE.
Turn the valve clockwise when heat IS not required. Turn
During operation of the machine, the torque converter oil
the valve counterclockwise when heat IS desired.
temperature should range between 200-210°F. If the
32. DEFROSTER FAN SWITCH. Turn this switch clockwise
temperature does not remain within this range, locate and
to energize the defroster fan. Control the speed of the fan by
correct the difficulty. The temperature must never exceed
turning the switch clockwise or counterclockwise as de-
40. TORQUE CONVERTER CHARGE PRESSURE GAUGE.
33. LOAD WEIGHING SYSTEM. The load weighing system
During operation of the machine, this gauge should indi-
continuously monitors load moment and boom angle. The
cate a pressure of approximately 30 psi. Wide variations
computer calculates and displays the load moment and the
from this pressure indicate a problem in the torque conver-
boom angle. If preset load limits are approached or ex-
ter. The machine should be shut down and the problem
ceeded, the computer visually and audibly alerts the opera-
corrected immediately At idle the chrage pressure should
tor. The items below are furnished with the load system.
be approximately 15 psi.
A. CENTRAL UNIT. The central unit monitors the variable
41. HYDRAULIC SYSTEM PRESSURE GAUGE. This gauge
boom and load operating conditions. These signals are
indicates the pressure in the upper hydraulic system. The
processed by the central unit and transmitted to the
normal pressure in this system is 1500 psi with a working
meters. The control unit contains some controls neces-
range of 1400-1710 psi.
sary to calibrate and test the computer system.
42. DIPPER TRIP CONTROL. Use this button to control the
B . LOAD MOMENT METER This meter indicates total load
dipper door on the shovel. Press the button to open the door.
moment. It also contains program selector switches.
Release the button to allow the door to close.
warning lights and horn and test buttons.
43. ELECTRICAL SYSTEM CIRCUIT BREAKERS. The func-
C. ANGLE METER. This meter indicates boom angle.
tion of the circuit breakers is to protect the various upper
This unit is an operating aid and cannot be used
as a substitute for the rating plate. To maintain
Under no circumstances should a circuit
system accuracy the unit must be properly
breaker be prevented from tripping by any
tested each day and before each major lift. The
means. Overloaded electrical circuits can
unit should be inspected on a weekly basis for
cause extensive damage to the machine
pinched or cracked cables. Also check that all
and/or injury to personnel.
connectors are tight.