190303HA Flashcards
Functions of the undercarriage
Provides traction
insurance machine is adequate load carrying capacity or flotation provides machine stability
Benefits of marrow tracks
Minimize wear
versatile
Benefits of wide track pads
Wide track pads provide better floatation for soft soil
What gives the machine stability
The width of the track pads and the position of each track frame in terms of the distance from the machines centre line
What does ROPS stand for
Roll over protective structure
What’s the difference between excavator and a drag line
Greg lines have long booms
What are the undercarriage subassemblies
Track frames pivot shaft and equalization bar track chains track and carrier rollers drive sprockets idlers track tension and recoil mechanism protective devices
What are the two methods of mounting track frames
Either fixed or oscillating
Difference between fixed and oscullating track frames
Fixed frames move as a unit with the frame of the unit.
Oscillating frames can pivot upward and downward around the mountain point
What are the three components of a track chain
Track links
track pins
bushings and seals
Five types of track pads
standard grouser open centre groucer all purpose rubber specialties
Three types of drive sprockets
One piece weld on
one piece bolt on
segmented bolt on
Benefit of a segmented sprocket
Track chain does not have to be removed to change sprocket
Three types of track and carrier rollers
Pedestal
conventional
bogie
What are pedestal or top rollers
Rollers at the top of the track supporting it from sagging
