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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
How are pins installed in the link?
Pressed in
26
What turns in a chain?
Pin turns in a bushing. Pin &pushing do not turn in their bore in the link
27
Which direction causes more wear on the bushings?
In Reverse
28
What are the two different split master link styles?
Fine or coarse tooth joint
29
Why do we not heat up pins to remove pin and bushings from chain links?
You will affect the heat treating and cause pre mature failures
30
What happens if you lubricate the track pins and bushings?
you can attract dirt, which can cause pre mature wear
31
Lubricated track pins are a serviceable part of a track chain?
NO, if the seals are leaking they must be removed and replaced
32
What can one higher temp pin on a chain tell you? Hint: on SALT tracks
That higher temp pin has leaked all its lubrication out and needs to be repaired
33
What is a better way to describe a chain stretching
Track pitch is being worn out
34
Describe track pitch
Distance from pin to pin to pin (on the links)
35
Does wearing the link out make the chain longer?
No
36
What is the most simply type of chain link?
Flat or Flush Link
37
What are two styles of master link coupling?
Split link and Pin (in a flush link system)
38
How is contamination restricted in a flush link system?
By small clearances between the left and right tack link assemblies
39
What should you use when driving master pins in?
Drift punch
40
What type of profile does an interlocking type of link have?
Stepped Profile
41
What is the most common style of link design?
Interlocking type
42
Why use an open centre grouser track pad?
Prevent packing
43
What happens to track tension when material is packed under the track pads?
Track tension increases, causing pre mature wear
44
Where do you see the most wear when track tension is too tight?
Sprockets and pin/bushings
45
How many grousers are on "street pads"?
atleast 2
46
What are two styles of rubber pads?
bolt on or one piece
47
How is rubber tracks driven?
Rubber idler, static friction, tension
48
What is the best lubricant when cutting rubber?
Water
49
If track is slipping what is the first check?
Track pressure, tension or slack
50
Bogie track rollers do what?
help maintain ground contact
51
What are bogie track rollers working with to maintain ground contact?
Equalizer bars
52
What is the most common final drive?
Planetary style
53
What does final drive give us for gear ratio?
Reduction
54
Low final drive is on what plain?
Track frame
55
What are some pros to high drive systems?
High Operator seat = better visibility Final drive is up and out of the dirt/mud Reduces shock loads
56
How are one piece sprockets attached?
Welded
57
What does bolt on sprockets eliminate or reduce?
The chance of misalignment the sprocket during install
58
When welding on a sprocket where should the ground be attached?
TO THE SPROCKET, to protect the final drive bearings
59
What is the big advantage of removing and installing segmented sprocket?
The segments can be replaced while the track/chain are still assembled on the machine
60
Rollers have what two flange design?
Double or single
61
Are flanges located on the inside or outside of roller?
Outside
62
Are flanges located on the inside or outside of roller?
Inside and outside. but they must have ONE on the outside
63
What will happen if the tracks are not aligned?
Idler will have uneven wear
64
When there is an alignment problem, on a piece of equipment that has oscillating side frames, what should you look at?
Equalizer pin wear
65
What is on the inside of a roller?
Bearing or bushing and some type of seal
66
What are the four types of tracks links?
Split master flush mount one-piece links interlocking links
67
True or false: Top Carrier roller flanges are on the inside and bottom rollers have flanges on the outside.
True. Bottom rollers can also have flanges on the inside
68
Where do we correct track alignment on a fixed track?
At the idler
69
Why should spring recoil systems be worked around carefully?
Heavy recoil springs are always preloaded by retainer, stored energy
70
What can cause a track to be loose?
``` broken spring - rough ride, keeps tension when refilled leaking adjuster (leaking grease) - repetitive refill ```
71
What can cause a track to be excessively tight?
mud packing - clean | Sheared center pin or broken retaining nut on a recoil system
72
What can a spring recoil system work with as a unit?
Hydraulic track tensioner
73
What can be done to cage the spring recoil system while it is on the machine?
You can use the blade or bucket against the idler to cage the recoil system
74
What can cause a rough ride in one track and not the other?
A broken spring in the recoil mechanism
75
In a air/nitrogen recoil system, the track tension is being loss daily what could be the cause?
The nitrogen is being leaked
76
In a air/nitrogen recoil system, the track tension is becoming tight during the operation. What could be the cause? Undercarriage is clean
Grease is being leaked out
77
In a air/nitrogen recoil system, the track tension is becoming tight during the operation. What could be the cause? Undercarriage is clean
Grease is being leaked out
78
To increase track tension in a spring recoil system what must be done?
Grease must be added
79
To decrease track tension on a spring recoil system what must be done?
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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