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HET3 Powertrain 190303 modules > 190303ha > Flashcards

190303ha Flashcards

1
Q

An undercarriage system must provide a balance between adequate traction, machine
stability and satisfactory load carrying capacity

A

true

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2
Q

The load carrying capacity of an undercarriage is determined mostly by the:

A

width of each track shoe.

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3
Q

The stability of the machine is more important when the machine is an excavator
rather than a crawler tractor equipped with a dozer.

A

true

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4
Q

A tracked crane is more suitable for:

A

lifting heavy loads that are very near to the machine.

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5
Q

Identify six (6) major components that comprise a typical undercarriage system.

A

a) track frames
b) pivot shaft and equalizer bar
c) track chain
d) track and carrier rollers
e) drive sprocket
f) idlers
g) track tension and recoil mechanisms
h) protective devices (guards)

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6
Q

Explain the main function of the track frame.

A

provides a solid support for the remaining undercarriage
components.
also absorbs shock loads caused by collisions between
the track assembly and immobile objects.

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7
Q

The following type(s) of track links are available for use as required by a specific
track chain application:

A

any of the above links could be used in track chains.

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8
Q

A master pin and a split master link have one function in common with each other.
Explain that function.

A

The master pin and the split master link are both used to hold the track chain
together. The master pin must be removed to split the track chain while the split link
must be disconnected in order to split the track chain.

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9
Q

A machine is operating on soil that could cause soil packing in and around the track
chain. Identify the type of track shoe you would recommend for this type of operating
condition

A

When soil packing is a problem the machine should be equipped with open centre
track shoes.

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10
Q

A low mount final drive and drive sprocket system could be used on:

A

any of the above machines are correct.

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11
Q

Explain the major difference between pedestal (carrier) rollers and track rollers.

A

Carrier rollers are mounted on pedestal members on top of the track frame and
support the weight of the top track. Track rollers are mounted on the bottom of the
track frame and help support the weight of the machine.

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12
Q

The three track and carrier roller configurations are?

A

Pedestal (carrier) rollers
Conventional track rollers
Bogie style track rollers

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13
Q

Pedestal rollers are located where in the track assembly? And perform what task?

A

They are located on the top section of the track assembly and support the weight of the track above the frame

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14
Q

Conventional (track) rollers function is to?

A

Transmit the weight of the machine to the track chain and transmit shock loads to the track frame. As well as maintain track chain position through the flanges

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15
Q

Bogie style rollers are a pivoting roller assembly the purpose of this is?

A

To maximize the amount of track surface area in all load conditions

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16
Q

Two types of roller shells are?

A

Double and single flange rollers

17
Q

In many tracked applications a unit has both single and double flange rollers used. What style roller goes before the sprocket?

A

Single flanged roller is always located next to the sprocket

18
Q

Track links are connected together using one of two main track link configurations. What are they?

A

Flush type and the interlocking type

19
Q

Where are flush type track links used?

A

At the point where the master pin is located.

20
Q

Disadvantage of flush type track links?

A

increased chance of contamination and therefore increased wear

21
Q

Common track pad designs? (5)

A
  • standard grouser,
  • open centre grouser,
  • all purpose (multi-grouser or street pads),
  • rubber and
  • specialty shoes (extreme service).
22
Q

What type of track pad would be used when soil conditions cause packing between the drive sprocket teeth and the track chain?

A

Open centre track pads

23
Q

What is the seal that prevents lubricant loss in a carrier roller assembly?

A

A duo cone seal.

24
Q

What does the duo cone seal consist of?

A

2 torc rings (rubber seals) and 2 metal sealing rings.

25
Q

What is the function of the idler?

A

When they are connected to the track tensioner they absorb impact shocks during operation.

26
Q

What function does the centre flange have on the idler?

A

It helps maintain alignment of the track during operation.

27
Q

The idlers and rollers of a machine are similar but have one distinct difference, what is it?

A

The idlers are not fixed as the rollers are.

28
Q

Track tension specifications can be found where?

A

Service manual and operators manual. All manufacturers have individual specs.

29
Q

Tight tracks cause what?

A

Excessive wear on all under carriage components.

30
Q

Loose tracks have many ways of being adjusted, name them.

A

Threaded rod on smaller machines, pneumatic adjusters and hydraulic adjusters on larger machines.

31
Q

Major undercarriage subassemblies are identified as?

A
  • Track frames
  • Pivot shaft and equalizer bar
  • track chain
  • track and carrier rollers
  • drive sprocket
  • idlers
  • track tension And recoil mechanism
  • protective devices
32
Q

Track Frame provides mounting for what components?

A

Track rollers, carrier rollers, front and rear idlers, track tension and recoil mechanism

33
Q

Track frame assembly, when track chain and track pads are installed provide what for the machine?

A

Support during operation

34
Q

Explain a fixed track frame..

A

Track frames are unable to move independently

The machine, central frame and both track frames operate as a single unit

Increases machine stability

35
Q

Explain oscillating track frames..

A

Also known as swing frames for their ability to swing up and down

Uses and equalizer bar to support the front for the machine

Inner diagonal arm attached under machine to help the individual track frames stay in alignment with the machine frame

HET3 Powertrain 190303 modules (17 decks)

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