Lull 944E-42 Service Manual Download

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Electrical System

9.178

Model 644E-42/944E-42

Rev. 6/04

b. Warning Indicator Lights

There are seven additional “hidden” indicator lights in the
front dash panel that will illuminate during critical
circumstances. All seven warning indicator lights demand
immediate attention and vehicle servicing. In many
cases, the vehicle should be shut down AS SOON AS
PRACTICAL to prevent serious mechanical failure.

The warning indicator lights are:

Transmission Temperature Warning Indicator (1)

This light illuminates when the transmission oil
temperature is too high; above 250° F (121° C).
An audible alarm will also sound. Stop and idle
the vehicle with the transmission in (N) Neutral,
allowing time for cooling. If the light does not go

out after two minutes, shut the vehicle down.

Hydraulic Oil Temperature Warning Indicator (2)

This light illuminates when the hydraulic oil
temperature is too high; above 195° F (91° C).
Stop and idle the engine, allow time for cooling.
If the light does not go out after five minutes,
shut the vehicle down.

Engine Oil Pressure Warning Indicator (3)

This indicator light will come ON if the engine is
not started. This is normal. If the light comes ON
while the engine is running, this indicates that
the engine oil pressure is too low. When the
engine is running an audible alarm will also

sound when the low oil pressure light is ON. SHUT THE
VEHICLE DOWN AS SOON AS PRACTICAL.

Alternator Charging Warning Indicator (4)

This light illuminates to indicate a weak or
improperly working charging system or the
batteries are dead. Service the engine
alternator or batteries.

Engine Air Filter Restriction Warning Indicator (5)

This light illuminates when a restricted engine
air filter is detected. If the light is ON, service
the air filter(s).

Hydraulic Oil Filter Restriction Warning Indicator (6)

This light illuminates when a restricted
hydraulic oil filter is detected. If the light is ON,
service the hydraulic oil filter.

Low Brake Pressure Warning Indicator (7)

This light is located on the lower right side of
the front dash panel.

The light will come ON and the 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 vehicle operation, shut off engine
immediately, investigate, and repair before operating. DO
NOT operate vehicle when low brake pressure light or
buzzer is on.

If the low brake pressure light or buzzer remains ON,
place the travel select lever in the (N) NEUTRAL
DETENT position, engage the parking brake switch and
turn the engine OFF.

Have the service brake system serviced before using the
vehicle again. Contact your local JLG Service
Department, immediately to repair the system.

OT0990

OT1000

OT1010

OH2560

OT1020

OT1030

WARNING:

Operating the vehicle with

the service brake system malfunctioning will
cause reduced braking ability or no braking
ability when the service brake pedal is
depressed. Death or serious personal injury
could result from the inability to stop or slow
the vehicle.

Lull 944E-42, Service Manual

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