Instruments and controls, Gauges, Indicator lights – Lull 644B Operation Manual User Manual
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INSTRUMENTS AND CONTROLS
GAUGES
Gauges
Note: Gauges and indicator lights operate only when
the ignition switch is in the ON position.
(1) Engine Water Temperature—Registers from
100 to 240 °F. Normal operating temperature is
180 to 185 °F.
(2) Fuel Level—Shows fuel level in fuel tank.
(3) Transmission Oil Temperature—Registers
from 140 to 320 °F with Celsius equivalents. If
the temperature rises above 230 °F (110 °C) stop
the vehicle immediately, shift to neutral and run
the engine at half throttle. The temperature
should drop quickly. If the temperature does not
drop, shut off engine and investigate.
(4) Engine Oil Pressure—Shows operating engine
oil pressure. Gauge registers from 0 to 80 PSI.
Normal operating pressure is 55 to 60 PSI.
(5) Voltmeter—Indicates system voltage. Gauge
registers from 10 to 16 volts. Normal operating
voltage range is 14.5 to 15 volts. With ignition in
ON position and engine off, battery voltage is
indicated. This should normally be 12.6 volts.
(6) Hourmeter—Registers total hours of machine
operation.
INDICATOR LIGHTS
Indicator Lights
(1) Park Brake—Red lamp lights to show when park
brake is applied and goes out when park brake is
released.
(2) Low Brake Pressure—Red lamp lights and
buzzer sounds when service brake hydraulic
system pressure drops below the safe operating
level. Under normal conditions, the light and
buzzer will go out quickly after engine start. If the
light or buzzer does not go out or comes on
during machine operation, shut off engine
immediately, investigate, and repair before
operating. Do not operate machine when low
brake pressure light or buzzer is on.
(3) Rear Oscillation Lock—The rear oscillation lock
light will come on when the boom angle is above
40°.
240
190
160
130
100
WATER
FUEL
OIL
BATT.
F
3/4
1/2
1/4
E
16
14
12
10
V
psi
80
60
40
20
0
°F
TRANSMISSION
DECLUTCH
140
240
138
60
TRANS
280
320
160
115
0 0 0 0
0
HOURS
1
10
QUARTZ
°F
°C
PARK BRAKE
BRAKE
P
REAR
OSC
LOCK
1
5
2
6
4
H1042
3
240
190
160
130
100
WATER
FUEL
OIL
BATT.
F
3/4
1/2
1/4
E
16
14
12
10
V
psi
80
60
40
20
0
°F
TRANSMISSION
DECLUTCH
140
240
138
60
TRANS
280
320
160
115
0 0 0 0
0
HOURS
1
10
QUARTZ
°F
°C
PARK BRAKE
BRAKE
P
REAR
OSC
LOCK
H1042
2
1
3