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Heavy Equipment Technician Period 3 Alberta > 190303gA > Flashcards

190303gA Flashcards

1
Q

How are steering clutches applied?

A

Spring applied and hydraulically released

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2
Q

True or False? Non-Modularized track machines brake clutches are hydraulic applied and spring released?

A

TRUE

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3
Q

True or False? Modulerized track machines are hydraulically released and spring applied?

A

TRUE

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4
Q

How many brake pedals do most older track machines have?

A

Two Brake pedals

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5
Q

Can the blade on a piece of equipment act like a parking brake?

A

Yes when lowered to the ground

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6
Q

What is inside a crawler tractor brake assembly that can be dangerous during disassembly?

A

Very strong springs

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7
Q

In relation to steering and brake clutches. What can be done to create tight turns in a track type tractor?

A

When power flow is interrupted to the track on the inside of your turning circle, the brake can also be applied to keep that track from freewheeling

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8
Q

What is the name of a turn when one track is completely stopped?

A

Pivot

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9
Q

When wanting to make a right turn which side does powerflow need to be interrupted?

A

right side

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10
Q

What will be the operators complaint if the right track’s steering clutch is slipping?

A

The crawler will being turning right more than it should

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11
Q

Describe a hydraulically operated steering clutch?

Hint: KISS

A

Wet

Multi-Disc type clutch

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12
Q

How is operator input to the brakes transferred to the system?

A

Through a mechanical linkage: Connecting rod

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13
Q

How does an operator manually apply a parking brake?

A

Apply both pedals and move a level to the lock position to hold bother pedals down

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14
Q

Why were brakes changed from hydraulically applied to spring applied in newer equipment?

A

Safety: the brake cannot be forgotten to be applied, especially in stopped conditions

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15
Q

Where does oil go in a steering clutch if there is no input on the control leveler?

A

Steering valve vents the piston cavity to the sump

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16
Q

Is a steering clutch engaged or disengaged to provide a path of power?

A

The steering clutch must be applied or engaged to provide a path of power

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17
Q

What is the purpose of a brake booster?

A

To provide extra force when braking

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18
Q

In which driving direction does a brake band self energize?

A

the system is designed to self energize in both forward and reverse directions

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19
Q

Why is “cross steering” different from regular steering?

A

Only done down hill
The side in neutral will move faster than the side with the clutch engaged. Causing the neutral side to turn more than the engaged side.

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20
Q

Describe an oil flow priority valve?

A

Normally closed pressure control valve

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21
Q

If a torque converter circuit has major leakage will it affect the clutch and brake circuit?

A

No, the priority valve will protect the clutch and brake circuit

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22
Q

Where can another priority valve be found other than to protect the steering clutches and brakes?

A

After transmission clutches and before torque converter

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23
Q

What conditions are the steering and brake in when the steering control level is not pulled?

A

Steering clutch is engaged

Brake is released

24
Q

When the steering clutch is partially engaged and the brake is released, what position is the steering level in?

A

It is pulled slightly

25
Q

When is the brake fully applied and what is the steering clutch condition?

A

Steering level pulled fully and steering clutch is released

26
Q

What is the purpose of a brake valve?

A

To regulate pressure to the brakes(usually through a brake booster), to apply or disengage brakes

27
Q

Why is track chain tension important?

A

Track chain tension can be too tight or too loose. Too tight can pose a safety hazard too loose will provide poor abilities of the machine

28
Q

If Bronze particles are found in a filter element what could be the cause?

A

Possible Clutch failure

29
Q

What type of particles could be from a pump failure or wear?

A

Shiny steel particles

30
Q

What part(s) is failing when rubber contamination is found inside a filter?

A

Hoses or Seals

31
Q

Before performing operation testing on a machine what are some basic checks you should do?

A

Check fluid levels
Look for any obvious signs of damage or leaks
Make sure vehicle is suitable to be operated

32
Q

True or False: Always perform testing when oil is cold?

A

False, Operating temperature is required to perform accurate tests

33
Q

What is the most common way to increase temperature of oil to operating temp?

A

Torque Converter Stall

34
Q

Why should a torque converter stall test not be done in a small area?

A

If brakes are slipping the piece of equipment will move during the test

35
Q

Will you have a high stall speed or low stall speed if steering clutches are slipping?

A

High stall speed, in all ranges

36
Q

During operational testing what should be done throughout the testing?

A

Stop the vehicle and check the transmission for leaks or overheat in spots

37
Q

What is important to remember before doing any pressure testing?

A

Oil must be at operating temperature to get accurate readings

38
Q

If the steering system relief valve pressure is incorrect what must be done?

A

The valve must be adjusted, repaired or replaced (depending on the type of fault)

39
Q

What could be the problem if the steering system relief valve pressure is low at low engine RPM?

A

The system has too much leakage

40
Q

In a spring released, hydraulic applied braking system: What should brake pressure do when lever is moved into the braking position?

A

Brake pressure to the brake booster should steadily rise

41
Q

Can steering clutches and brakes always be repaired on the machine?

A

No, they must be removed to be repaired or replaced

42
Q

What are some safety precautions that can be done before removing steering clutches or brakes?

A 
Recognize all safety information
Park machine on level, hard surface
Block the machine, so it will not roll
Always use proper jacks and blocks
Relieve all hydraulic and air pressure, all hydraulic operated components should be lowered or supported
43
Q

Steering clutches and brakes are equipped with strong _______, used to apply or release them?

A

Springs

44
Q

How can you safely disassemble a clutch or brake assembly?

A

Using a press or available long bolts to slowly release force

45
Q

What should bearings and friction discs be cleaned with?

A

Mineral spirits (Varsol)

46
Q

What is done to parts after being cleaned and before being put into storage?

A

A thing coating of lubrication is applied to prevent corrosion

47
Q

What are some checks that should be done on bearings and bushings?

A

Check for: Rough rotation, scoring, pitting, scratches on surfaces, cracked/chipped races, roller or ball wear, wear to indicated that the bearing has been turning in the bore or on the shaft

48
Q

Friction discs are inspected for?

A 
burrs
embedded material
pitted friction material
cracks and distortion
flaking friction material
damaged spline teeth
49
Q

How many places should discs be measured?

A

A minimum of three places

50
Q

Discs must be perfectly flat, true or false?

A

False, you must follow manufactures spec, there could be allowance for some warpage.

51
Q

How is warpage measured on a disc?

A

On a flat surface with feeler gauges

52
Q

What is another component that should be inspected during repairs and replacements to the steering and brake clutches?

A

The bevel gear shaft should be inspected and serviced

53
Q

If a brake linkage is adjusted incorrectly what could happen?

A

The brake will apply or release when unwanted

54
Q

When are brake linkages adjusted?

A

After the clearance is adjusted between the brake band and drum

55
Q

Steering clutches do what on a machine that is equipped with a steering clutch and brake type steering system?

A

Steering clutches deliver power to the final drive

56
Q

What are two types of brake in steering clutch and brake equipped machines?

A

Band Type

Multi Disc, oil bath brakes

57
Q

What are the springs trying to do to the levers?

Hint; in a steering clutch and brake system

A

The springs act on the linkage to hold the levers in their NORMAL position. Brakes are released and steering clutches are fully engaged

Heavy Equipment Technician Period 3 Alberta (15 decks)

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