2. Frame And Suspension Service Flashcards
a faulty frame can cause:
Erratic steering
Excessive tire wear
what is a frame sidesway?
what are possible causes?
When the frame is bent to one side
Accident, collision, rollover, fire, mounted equipment that places excessive force on frame
diamond or weaving frame
when one frame rail moves ahead of the other.
Causes: accident, collision, towing with chain on one corner, use of mounted equipment
twisted frame
frame is rolled to one side.
accident, rollover, rough terrain operation
frame sag
frame is bent downward.
collision, overloading, improper frame modification
frame bow
frame that is bent upward
what is lightest bolt that can be used to attach things to a frame?
grade 8
wandering describes a:
situation where driver has trouble maintaining straight ahead operation.
what is bottoming?
condition that occurs when the energy-absorbing devices of the suspension are unable to support the weight of the vehicle and load, and absorb energy from vehicle jounces
what should be used to mark a frame rail?
chalk or soapstone
what are common causes of broken leaf springs?
- vehicle is overloaded
- insufficient u-bolt torque
- loose center bolt allows slippage in spring assembly
- worn pins causing excessive spring end play
what are common causes of vehicle bottoming with leaf springs?
- Overloading
- Broken leaf springs
- Weak springs
what are common causes of vehicle bottoming with air springs?
- Low system pressure
- Excessive air leakage
- Air spring cut or punctured
- maladjusted ride height control valve
- faulty ride height control or dump valve
Even before washing what inspection can be done on suspension?
look for things that are shinny
the thrust from a properly aligned drive axle will act:
along the frame centreline
