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Powertrain > 303 Ha And Hb > Flashcards

303 Ha And Hb Flashcards

1
Q

Triangle of undercarriage ?

A

Traction

Stability

Load carrying capacity

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2
Q

What kind of track pads are used to minimize undercarriage wear?

A

Narrowest track pads possible for job application

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3
Q

Undercarriage machine applications?

A

Crawler tractors

Excavators and shovels

Cranes

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4
Q

Undercarriage system components?

A

Track frame

Pivot shaft/equalizer bar(hard bar)

Track chain link assembly

Track and carrier rollers

Idlers

Track tension and recoil mechanism

Protective guards

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5
Q

What is the track frame?

A

Rigid structure undercarriage component are mounted too

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6
Q

What is a fixed track frame?

A

Rigid design and connected directly to machine. Increases machine stability. Lower operator comfort level

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7
Q

Oscillating track frame?

A

Uses equalizer bars and braces to let the track frame walk over unravel ground separate from the other frame and machine

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8
Q

Track chain construction?

A

Links

Pins

Bushings and seals

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9
Q

What’s the split master link?

A

Provides and easy method for uncoupling the track chain. Uses a tooth joint and long bolts to connect the half links together

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10
Q

What are standard pins?

A

Constructed of heat treated steel and hardened steel. The are slip fit into bushings and mounted into the small end of the track chain

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11
Q

What is the master pin?

A

Tracks that do not use master links will use the master pin. Can be identified by the slight recess on end of pin and is slightly smaller in diameter

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12
Q

What is a lubricated track?

A

Sometimes called a sealed and lubricated track (SALT). Pin and bushing is sealed and rides on a small amount of oil. Quieter operation and lasts longer when maintained properly

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13
Q

Flush type track link configuration ?

A

Used with the master pin. Makes uncoupling the track a lot easier compared to interlocking. Downside is it has a increased chance of contamination

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14
Q

Interlocking type track link?

A

Design still allows pivoting action to occur but reduces the amount of contamination having the bushing and pin press fit into the links

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15
Q

Track shoe configurations?

A

Standard grouser

Open centre grouser

All purpose ( multi grouser/ street pads)

Rubber

Specialty shoes

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16
Q

Low sprocket design?

A

Traditional low mounted final drive. Lowers the centre of gravity. Increased stability.

17
Q

High sprocket design?

A

Reduces the effect of shock loads. Downside is they have increased internal pin and bushing wear because of a third track chain pivot

18
Q

Track and carrier roller configuration?

A

Pedestal carrier rollers

Track rollers

Vogue style track rollers

19
Q

What are pedestal carrier rollers?

A

Support the weight of the track.

20
Q

Track rollers?

A

Supports the weight of the machine on the track. Transmits shock loads from the track to the frame

21
Q

Bogie style track rollers?

A

Group of independent pivoting track rollers are used in place of a single track roller. Provides track contact over uneven ground

22
Q

What is the roller shell?

A

Larger outer structural member of any roller assembly

23
Q

2 types of roller shells ?

A

Single flange

Double flange

24
Q

Things to fix during track maintenance?

A

Track tension

Loose, damaged or missing components

Evidence of misalignment

Roller/idler leakage

25
Q

1 spot to see misalignment on an undercarriage?

A

Sprocket

26
Q

Evidence of misalignment?

A

Unusual roller flange wear from side hilling

27
Q

What must you be careful to watch when measuring track link wear?

A

To not measure with master pin in measurement

28
Q

How to measure drive sprocket tooth wear?

A

Measure three teeth apart on the sprocket. As the distance decreases the sprocket becomes more worn

29
Q

Low final drive front idlers must be what when installed?

A

Shimmed for alignment

30
Q

Can worn pins and bushing be turned to increase their service life?

A

Yes, once

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