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HET3 > 190303Ga > Flashcards

190303Ga Flashcards

1
Q

Brake band friction material is inspected for?

A

Burrs, embedded metal particles, severely pitted material, cracks/distortion and flaking.

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2
Q

Brake drums may be reused if there is blue colouring and flaking. T/F

A

False. Heat checking can lead to failure. So can a large amount of wear, distortion and signs of over heating.

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3
Q

Wear, scratches, nicks and scoring should be checked for on this component?

A

Piston sealing surfaces.

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4
Q

All disks; friction, clutch and brake, must have 2 tools to be able to measure for what?

A

Flat surface and feeler gauges to measure for wear, warpage and coning.

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5
Q

Manufacturers recommended procedures will only have scattered information regarding component. T/F

A

False. Manufacturers recommended procedures will have exact assembly instructions and specifications.

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6
Q

What are 2 ways to check steering and brake clutches during disassembly/assembly?

A

Feeler gauges and stack height.

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7
Q

Improper clearance in steering and brake discs will cause what to happen?

A

The discs will drag resulting in over heating. Failure is imminent.

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8
Q

As it is apart anyway, a check on this component should be done.

A

Bevel gear and shaft.

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9
Q

The service manual will give proper adjustments for these important input devices.

A

Steering clutch and brake linkages.

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10
Q

In a non-modular track steering machine, the brake valve regulates ____ to the brakes.

A

Pressure

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11
Q

Like the steering valve, the brake valve regulates pressure in accordance with ____ ____ ____ movement.

A

Steering control lever

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12
Q

On a machine that is equipped with a steering clutch and brake type steering system,power is delivered to the final drives through the:

A

steering clutches.

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13
Q

A gradual turn is accomplished on a tracked machine equipped with steering clutchesand brakes by applying the brakes T/F

A

false;

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14
Q

Applying the track brake and disengaging the same side clutch on a machineequipped with steering clutches and brakes will cause the machine to:

A

perform a sharp turn.

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15
Q

Steering clutches and brakes are released with the steering control levers in theirnormal position. T/F

A

false

Clutch is engaged and brakes are released

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16
Q

List two (2) common brake types used in steering clutch and brake equippedmachines.

A

a) band-type brakesb) multiple-disc, oil bath brakes

17
Q

Many modern crawler tractors are equipped with modularized steering clutch andbrake assemblies. On these units, the:

A

brakes and clutches are spring applied.

18
Q

A priority valve is often used when the transmission charging pump is used to supplysteering clutch and brake control system. The function of the priority valve is to:

A

Ensure that oil flow from the transmission charging pump satisfies the needs of thesteering clutch and brake control system before allowing oil to flow to thetransmission or torque converter.

19
Q

Caution must be taken when disassembling crawler tractor brake assemblies becausethey contain:

A

very strong springs

20
Q

List four (4) friction disc faults that should be noted when performing a visual inspection

A

a) burrsb) embedded metal particlesc) severely pitted friction materiald) cracks and distortion

21
Q

A flat surface and a set of feeler gauges are required when checking clutch and brakediscs for

A

warpage and cone.

22
Q

If steering clutch and brake linkages are out of adjustment, the clutches and brakesmay not fully apply or release.T/F

A

true

23
Q

What are 5 visual inspections you should make

A

1) Power train oil level and condition
2) Leakage
3) Control linkage condition and adjustment
4) Condition and adjustment of tracks
5) Check filters

24
Q

What are you looking for while inspecting the control linkages

A

Inspect for bent or damaged components, ensure that the linkage operates smoothly with no binding and that the linkage is correctly adjusted.

25
Q

Why is it important to warm the the steering system to operating temp.?

A

Steering system leakage increased significantly as the oil temp increases. Normal operating temp. Is between 65.5C (150F) and 82.2C (180F)

26
Q

If you have a slipping brake what will be the result during a stall test?

A

Creeping forward or veering to the left or right.

27
Q

What is a sign of slipping steering clutches in a stall test

A

Stall speed that is higher than specification in all transmission ranges.

28
Q

Non-modularized brake systems use what type of brake?

A

The brake is a wet contracting band type

29
Q

In a non-modularize brake and steering clutch when is the brake applied?

A

When the steering control lever is pulled out all the way

30
Q

The friction material in a brake band must be inspected for burrs, embedded metal particles,pitted friction material, cracks, distortion and flaking friction material.
If any faults are found what must be done?

A

The brake bands must be re-lined or replaced

31
Q

Brake drums should be inspected for what?

A

Cracks and heat checks, wear and distortion, and overheating

32
Q

What are two ways to check clutch and brake disc clearances?

A

Stack height checks or by using feeler gauges.

33
Q

What’s another name for a bevel gear shaft?

A

The cross shaft

34
Q

True or false. Brake linkage adjustments are made after the clearances adjusted between the brake band and drum

A

True. Tighten the band all the way, back off one and a half turns. Then make any necessary brake linkage adjustments

35
Q

Pressure gauge reading should be done at what rpm?

A

Low idle and high idle

36
Q

A pressure gauge installed before braking circuit should read?

A

0 when not applied. As lever is pulled smooth engagement to max pressure

37
Q

Cooler bypass valve opens when?

A

Excessive restriction in cooler is found. As a result lube circuit starvation occurs

38
Q

On a unit equipped with steering clutches engine power is transmitted through the transmission and split equally between the left and right tracks. (T/F)

A

True.

HET3 (35 decks)

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