TUBE (BULK) 1652476 - Caterpillar

Manual Secondary Steering Test
Manual Secondary Steering Test
The manual test for the secondary steer system should be performed every 100 hours of machine operation or every two weeks.During a manual secondary steering test, all implement and primary steering functions are disabled by the Implement ECM for the duration of the test.In order to perform the manual secondary steering test, the engine must be running and the machine speed must be zero. To begin the test, the operator holds the momentary secondary steering test switch in the test position.When the Implement ECM detects the switch input circuit has been grounded through the switch, the Implement ECM will initiate the manual test for the system.First, the Implement ECM disables the primary steering system and the implement system. The Implement ECM will send a 60 percent PWM duty cycle signal to the Transmission/Chassis ECM over the secondary steering request circuit. A 60 percent duty cycle indicates that the Transmission/Chassis ECM should activate the secondary steer pilot solenoid valves.The operator should immediately move the left joystick to the steer left and the steer right positions. If the front wheels follow the steer commands, the secondary steer system is performing correctly.If the operator holds the momentary secondary steer test switch in the test position for 10 seconds, the Implement ECM will deactivate the test mode.Note: If the front wheels do not respond correctly to the steering commands within the ten second time limit, the machine must be immediately shutdown in a safe manner. There is a problem in the secondary steer system that must be investigated and repaired before operating the machine.Cold Transmission Oil Mode
The cold transmission oil mode is active when the transmission oil temperature is less than or equal to 40°C. If the transmission oil sensor is faulty, the torque converter output temperature sensor is used. A temperature reading of less than or equal to 110°C at the torque converter output temperature sensor will then trigger the cold transmission oil mode. If both the transmission oil temperature sensor and orque converter temperature sensor fail, then a reading less than or equal to 85°C at the engine coolant temperature sensor will be used to trigger the cold transmission oil mode.The cold transmission oil mode is active under the following conditions:
The park brake is off.
The temperature of the transmission oil is less than or equal to 40°C (when read by the oil temperature sensor).
The temperature of the torque converter is less than or equal to 110°C (condition applies only when the oil temperature sensor is faulty).
The temperature of the coolant is less than or equal to 85°C (condition applies only when oil temperature sensor and torque converter temperature sensor are both faulty).The machine operator will experience the following conditions, when the cold transmission oil mode is active:
Shifts from neutral are limited to 3F and 2R.
Up and downshifting is not allowed.
Directional shifts are limited to 3F-2R and 2R-3F.
Lockup clutch engagement is disabled.
Temperature compensation is disabled.Air Conditioning System
Illustration 8 g02089155
Air conditioning control circuit connectionsThe attachment air conditioning