D3C Series III, D4C Series III and D5C Series III HYSTAT Track-Type Tractors Alert Indicators Caterpillar


Alert Indicators
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D3C Series III, D4C Series III and D5C Series III HYSTAT Track-Type Tractors [SEBU7077]
ELECTRICAL AND STARTING SYSTEM
LIGHTING GP
D3C Series III, D4C Series III and D5C Series III HYSTAT Track-Type Tractors Alert Indicators



Illustration 1g00118132


High Speed (1) - The alert indicator will light when the right side of the speed selector switch is depressed. The alert indicator will go out when the left side of the speed selector switch is depressed.


Electrical System (2) - The alert indicator will light when there is a malfunction in the electrical system. If this alert indicator comes on, the system voltage is too high for normal machine operation or too low for normal machine operation.

If electrical loads (air conditioning and/or lighting) are high and the engine speed is near idle, increase the engine speed to high idle. This will generate more output from the alternator. If the alert indicator for the electrical system turns off within one minute, the electrical system is probably operating in a normal manner. However, the electrical system may be overloaded during periods of low engine speeds.

Modify the operating cycle in order to prevent overloading the electrical system and discharging the batteries.

Low idle must be set correctly. Adjust for the high side of the Low Idle specification while the most often used electrical loads are turned on. In order to reduce the loads, use the Medium fan speed instead of the High fan speed.

If this procedure does not cause the alert indicator to turn off, move to a convenient location. Investigate the cause (loose alternator belt, broken alternator belt, defective batteries, etc).

If the engine speed is near operating speeds and if the electrical loads are light, the alert indicator may remain on. If the alert indicator remains on, move to a convenient location. Investigate the cause (loose alternator belt, broken alternator belt, defective batteries, etc).


Hydraulic Oil Filter Bypass (3) - The alert indicator will light when the hydraulic oil bypasses the hydraulic oil filters. If this alert indicator comes on, move the machine to a convenient location. Investigate the cause.

Note: In extreme cold situations, the indicator will come on until the hydraulic oil warms up.


Parking Brake (4) - The alert indicator will light when the parking brake is engaged and the transmission is in NEUTRAL. The alert indicator should come on during start-up. The alert indicator should go out when the parking brake is released.

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