2278437 BLOCK Caterpillar parts BLOCK
Alternative (cross code) number:
Brake Retract - Move and hold the switch to on, to operate the brake retraction motor. Release the switch and it will return to off. Raise the protective cover to move the switch. This switch is used to retract the brakes for towing. Do not keep the switch on. Operate for 15 to 20 seconds.Automatic Electronic Traction Aid (AETA) Switch (If Equipped)
Move the switch to ON, to test the system. Move the switch to OFF. This switch is used to test the AETA for proper operation.Reverse Inhibitor Switch
The switch is located behind the operator's seat. The machine will not move back when the hoist is in raise. (It will go forward.)Back-up Alarm
Back-up Alarm - The alarm will sound when the transmission control lever is in the reverse position. It is used to alert people behind the machine that it is backing up.The back-up alarm is located on the rear of the machine. A three position HIGH, LOW and MEDIUM switch at the rear of the back-up alarm regulates its volume.The alarm is set at the highest sound level when shipped from the factory. The setting should remain on high, unless the job-site requires a lower level.Heating and Air Conditioner
Heat and Air Conditioning Fan Speed Switch - This switch controls the heating and air conditioning three speed blower fan motor. Off (1) - Move the switch to this position to stop the blower fan.Move the switch to the right to operate the heating system. High - H (2) - Move the switch to this symbol for highest fan speed. Medium - M (3) - Move the switch to this symbol for a medium fan speed. Low - L (4) - Move the switch to this symbol for lowest fan speed.Move the switch to the left to operate the air conditioning system. Low - L (5) - Move the switch to this symbol for lowest fan speed. Medium - M (6) - Move the switch to this symbol for a medium fan speed. High - H (7) - Move the switch to this symbol for highest fan speed.Temperature Control (8) - Heater
Temperature Variable - Turn the knob anywhere between OFF (left) and MAXIMUM (right) heat.Temperature Control (9) - Air Conditioning
Temperature Variable - Turn the knob anywhere between OFF (left) and MAXIMUM (right) cool.Heating and Air Conditioning System Operation
The heating and air conditioning system can perform four functions:
Heating - Turn the blower fan switch to LOW, MEDIUM or HIGH speed. Adjust the temperature variable control for the desired temperature.
Cooling - Turn the blower fan switch to LOW, MEDIUM or HIGH speed. Adjust the temperature variable control for the desired temperature.
Pressurizing - Pressure inside of the cab will help keep dust out, when heating or cooling is not desired.Turn the temperature variable controls to OFF. Turn heating fan to either LOW, MEDIUM or HIGH speed, depending on the