CAB GP 2119049 - Caterpillar

Illustration 1 g00666632
Joystick with auger control (1)
The auger of the Wheel Tractor-Scraper is controlled by a trigger on the joystick. The trigger on the joystick sends switched signals to the ECM. The signal for reversing the auger is sent to connector contacts J1-27 and J1-4. Connector contact J1-27 is normally open. Connector contact J1-4 is normally closed.The signal for moving the auger forward is sent to connector contacts J1-54 and J1-38. Connector contact J1-54 is normally closed. Connector contact J1-38 is normally open. When the operator depresses the trigger on the joystick, the state of the contacts will change. The ECM will energize the auger solenoid in order to begin forward rotation of the auger through connector contact J2-60. The ECM sends a signal in order to move the auger in reverse to connector contact J2-63. The ECM also controls the Bail Lowering / Auger Turning Lamp through a connector contact J2-62. The lamp is turned on when the auger is rotating in either forward or reverse direction.When the Wheel Tractor-Scraper is started, the auger forward solenoid and the auger reverse solenoid are de-energized , and the indicator lamp is off. When the operator briefly presses the auger switch (trigger), the auger forward solenoid is energized through connector contact J2-60. The auger will begin to rotate in the forward direction and the indicator lamp will illuminate. The next press of the auger switch (trigger) will de-energize the auger forward solenoid. The auger will stop moving and the indicator lamp will be off. When the operator holds the auger reverse switch, the auger forward solenoid and the auger reverse solenoid are de-energized for one second. After one second, the auger reverse solenoid will be energized through connector contact J2-63. The auger will begin to spin in the reverse direction and the indicator lamp will illuminate. When the operator releases the auger switch, the auger forward solenoid and the auger reverse solenoid will be de-energized. The auger will stop moving and the indicator lamp will be off. A command for reversing the auger always overrides a command for moving the auger forward.When the hydraulic temperature is above 38 °C (100 °F) and the input from the auger filter switch (connector contact J1-3) is not grounded, a category 1 alarm will be activated.Switch (Auger Slip Limit)
The switch (auger slip limit) is only present on the 627G and 637G Wheel Tractor-Scrapers that are equipped with an auger. When the auger is rotating and the operator depresses the auger slip limit switch, the scraper engine control power is de-rated in order to prevent slippage of the rear wheels. When the auger is not rotating and the operator depresses the auger slip limit switch, machine operation will not be affected.