190303 Gb Flashcards

1
Q

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
  • a steering differential
  • a hydraulic pump
  • a hydraulic steering motor
  • steering controls
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2
Q

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.

A

gained

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3
Q

What controls motor displacement control valve?

A

The pressure differential signal sent from the motor pressure control pilot valve

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4
Q

What is the function of the oil cooler?

A

To remove excess heat from the oil

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5
Q

True or False

The bypass valve is a temperature controlled unit that provides a fast warm-up for the steering system

A

True

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6
Q

What’s the purpose of the cooler bypass valve?

A

Prevent oil flow through the cooler until oil temperature reaches approximately 63°C

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7
Q

What’s the purpose of the engine speed control sensor

A

The engine speed control sensor sensor voltage signal to the ECU indicating the position of the engine throttle

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8
Q

What’s the purpose of the left/right steer sensor?

A

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

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9
Q

What is the purpose of the forward/neutral/reverse sensor?

A

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

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10
Q

How is power transmitted to the steering differential during counter rotation?

A

Power is transmitted to the steering differential through the steering motor. Powershift transmission would be in neutral.

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11
Q

The brakes on a differential steering are for steering. T/F

A

False. They are for stopping or slowing.

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12
Q

A Belleville spring is a high pressure spring that remain on in the brake system. T/F

A

True. The Belleville spring is a coned washer released by transmission charge oil.

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13
Q

The application of the brakes in a differential steering system with the transmission engaged does what function?

A

Causes the torque divider to go into a stall condition.

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14
Q

In a CAT differential steer system when travelling in a straight line both sides of the dif experience a _______ reduction and have the ________ rpm

A

Experience a TRIPLE reduction and the SAME rpm

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15
Q

When steering in a CAT differential steer system power is supplied from?

A

Both steering motor and powershift transmission

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16
Q

In a CAT differential steer system the sharpest turn is achieved at?

A

The biggest difference in speed

17
Q

Name the system that consists of two closed-circuit pressurized drive systems that control the speed and direction of each track.

A

Hydrostatic Steering System.