303Gb Flashcards
Some crawler tractors use a differential steering system to allow the operator to maneuver the machine. The major components of the steering system are:
- a steering differential
- a hydraulic pump
- a hydraulic steering motor
- steering controls
Power flow in a differential steer tractor is maintained to both tracks through turns and any speed lost to one track is _____ by the other.
gained
What controls motor displacement control valve?
The pressure differential signal sent from the motor pressure control pilot valve
What is the function of the oil cooler?
To remove excess heat from the oil
True or False
The bypass valve is a temperature controlled unit that provides a fast warm-up for the steering system
True
What’s the purpose of the cooler bypass valve?
Prevent oil flow through the cooler until oil temperature reaches approximately 63°C
What’s the purpose of the engine speed control sensor
The engine speed control sensor sensor voltage signal to the ECU indicating the position of the engine throttle
What’s the purpose of the left/right steer sensor?
The left/right steers sensor sends a variable voltage signal to the ECU indicating the direction the operator wishes to turn and the degree of turn desired
What is the purpose of the forward/neutral/reverse sensor?
The FNR Sensor provides a voltage signal to the ECU that indicates whether the operator has positioned the control lever in forward neutral or reverse
How is power transmitted to the steering differential during counter rotation?
Power is transmitted to the steering differential through the steering motor. Powershift transmission would be in neutral.
The brakes on a differential steering are for steering. T/F
False. They are for stopping or slowing.
A Belleville spring is a high pressure spring that remain on in the brake system. T/F
True. The Belleville spring is a coned washer released by transmission charge oil.
The application of the brakes in a differential steering system with the transmission engaged does what function?
Causes the torque divider to go into a stall condition.
In a CAT differential steer system when travelling in a straight line both sides of the dif experience a _______ reduction and have the ________ rpm
Experience a TRIPLE reduction and the SAME rpm
When steering in a CAT differential steer system power is supplied from?
Both steering motor and powershift transmission
