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Heavy Equipment Technician Period 3 Alberta > 190303hA > Flashcards

190303hA Flashcards

1
Q

Three functions of the undercarriage system?

A

Traction
Load Carrying
Machine Stability
(flotation)

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2
Q

What is minimized when a narrow track pad is used?

A

The amount of undercarriage component wear

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3
Q

ROPS stands for?

A

Roll Over Protective Structure

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4
Q

LGP stands for?

A

Low Ground Pressure

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5
Q

When do fixed track frames move independently?

A

never

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6
Q

What is another name for oscillating track frames?

A

Swing Frames

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7
Q

What are the three major components of a track chain?

A

Track Links
Track Pins
Bushings/Seals

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8
Q

Describe the average track link design?

A

Solid, One-Piece

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9
Q

What is the design of a master link?

A

Split

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10
Q

What are two types of track pins?

A

Standard and Master

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11
Q

Lubricated track is sometimes called?

A

a sealed and lubricated track SALT

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12
Q

What do larger track pads provide?

A

Better flotation

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13
Q

The shortest pad helps reduce wear because?

A

Shortens lever length

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14
Q

24” pads should be used in what conditions?

A

Loose, wet, starting construction

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15
Q

30-32” are used for what conditions?

A

Wet, Muddy ground. LPG & flotation is better

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16
Q

What are two styles of rollers?

A

Single or double flanged

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17
Q

What does an idler do on an undercarriage?

A

Change direction of tracks

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18
Q

Why do bulldozers use a non-fixed undercarriage?

A

To maintain ground contact

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19
Q

What are two major causes of undercarriage failure?

A

Too wide of pads and wrong track tension

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20
Q

Some tracks are attached to the drive chain, why do they have unique wear patterns?

A

Since they are attached the chain they will wear on the roller in different ways depends on ground level and condition

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21
Q

Side hill work will cause wear on what?

A

Uphill side of the chain and down hill side of the flange (roller), on both tracks

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22
Q

Other names for track frames?

A

Swing frame & Roller frame

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23
Q

Equalizer bars are set underneath?

A

The engine

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24
Q

Pin style equalizer bars do what?

A

Hold tracks in alignment

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25
Q

How are pins installed in the link?

A

Pressed in

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26
Q

What turns in a chain?

A

Pin turns in a bushing. Pin &pushing do not turn in their bore in the link

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27
Q

Which direction causes more wear on the bushings?

A

In Reverse

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28
Q

What are the two different split master link styles?

A

Fine or coarse tooth joint

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29
Q

Why do we not heat up pins to remove pin and bushings from chain links?

A

You will affect the heat treating and cause pre mature failures

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30
Q

What happens if you lubricate the track pins and bushings?

A

you can attract dirt, which can cause pre mature wear

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31
Q

Lubricated track pins are a serviceable part of a track chain?

A

NO, if the seals are leaking they must be removed and replaced

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32
Q

What can one higher temp pin on a chain tell you?

Hint: on SALT tracks

A

That higher temp pin has leaked all its lubrication out and needs to be repaired

33
Q

What is a better way to describe a chain stretching

A

Track pitch is being worn out

34
Q

Describe track pitch

A

Distance from pin to pin to pin (on the links)

35
Q

Does wearing the link out make the chain longer?

A

No

36
Q

What is the most simply type of chain link?

A

Flat or Flush Link

37
Q

What are two styles of master link coupling?

A

Split link and Pin (in a flush link system)

38
Q

How is contamination restricted in a flush link system?

A

By small clearances between the left and right tack link assemblies

39
Q

What should you use when driving master pins in?

A

Drift punch

40
Q

What type of profile does an interlocking type of link have?

A

Stepped Profile

41
Q

What is the most common style of link design?

A

Interlocking type

42
Q

Why use an open centre grouser track pad?

A

Prevent packing

43
Q

What happens to track tension when material is packed under the track pads?

A

Track tension increases, causing pre mature wear

44
Q

Where do you see the most wear when track tension is too tight?

A

Sprockets and pin/bushings

45
Q

How many grousers are on “street pads”?

A

atleast 2

46
Q

What are two styles of rubber pads?

A

bolt on or one piece

47
Q

How is rubber tracks driven?

A

Rubber idler, static friction, tension

48
Q

What is the best lubricant when cutting rubber?

A

Water

49
Q

If track is slipping what is the first check?

A

Track pressure, tension or slack

50
Q

Bogie track rollers do what?

A

help maintain ground contact

51
Q

What are bogie track rollers working with to maintain ground contact?

A

Equalizer bars

52
Q

What is the most common final drive?

A

Planetary style

53
Q

What does final drive give us for gear ratio?

A

Reduction

54
Q

Low final drive is on what plain?

A

Track frame

55
Q

What are some pros to high drive systems?

A

High Operator seat = better visibility
Final drive is up and out of the dirt/mud
Reduces shock loads

56
Q

How are one piece sprockets attached?

A

Welded

57
Q

What does bolt on sprockets eliminate or reduce?

A

The chance of misalignment the sprocket during install

58
Q

When welding on a sprocket where should the ground be attached?

A

TO THE SPROCKET, to protect the final drive bearings

59
Q

What is the big advantage of removing and installing segmented sprocket?

A

The segments can be replaced while the track/chain are still assembled on the machine

60
Q

Rollers have what two flange design?

A

Double or single

61
Q

Are flanges located on the inside or outside of roller?

A

Outside

62
Q

Are flanges located on the inside or outside of roller?

A

Inside and outside. but they must have ONE on the outside

63
Q

What will happen if the tracks are not aligned?

A

Idler will have uneven wear

64
Q

When there is an alignment problem, on a piece of equipment that has oscillating side frames, what should you look at?

A

Equalizer pin wear

65
Q

What is on the inside of a roller?

A

Bearing or bushing and some type of seal

66
Q

What are the four types of tracks links?

A

Split master
flush mount
one-piece links
interlocking links

67
Q

True or false: Top Carrier roller flanges are on the inside and bottom rollers have flanges on the outside.

A

True. Bottom rollers can also have flanges on the inside

68
Q

Where do we correct track alignment on a fixed track?

A

At the idler

69
Q

Why should spring recoil systems be worked around carefully?

A

Heavy recoil springs are always preloaded by retainer, stored energy

70
Q

What can cause a track to be loose?

A 
broken spring - rough ride, keeps tension when refilled
leaking adjuster (leaking grease) - repetitive refill
71
Q

What can cause a track to be excessively tight?

A

mud packing - clean

Sheared center pin or broken retaining nut on a recoil system

72
Q

What can a spring recoil system work with as a unit?

A

Hydraulic track tensioner

73
Q

What can be done to cage the spring recoil system while it is on the machine?

A

You can use the blade or bucket against the idler to cage the recoil system

74
Q

What can cause a rough ride in one track and not the other?

A

A broken spring in the recoil mechanism

75
Q

In a air/nitrogen recoil system, the track tension is being loss daily what could be the cause?

A

The nitrogen is being leaked

76
Q

In a air/nitrogen recoil system, the track tension is becoming tight during the operation. What could be the cause? Undercarriage is clean

A

Grease is being leaked out

77
Q

In a air/nitrogen recoil system, the track tension is becoming tight during the operation. What could be the cause? Undercarriage is clean

A

Grease is being leaked out

78
Q

To increase track tension in a spring recoil system what must be done?

A

Grease must be added

79
Q

To decrease track tension on a spring recoil system what must be done?

A

Use the bleed screw to allow some grease to come out

DO NOT PUT YOUR FACE NEAR THE BLEED SCREW

Heavy Equipment Technician Period 3 Alberta (15 decks)

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