frame suspension Flashcards
list the 3 functions of a vehicle frame
- provide platform for major vehicle components
- support the load it is carrying
- resist shock and torsion loads
define the function of a vehicle cross-frame
provides strength and rigidity
the term “section modulus” refers to..
- height
- width
- thickness
- shape
list 4 functions of the suspension system
- support the vehicle and cargo weight
- secure the axles to the frame while maintaining proper alignment
- cushion shock loads
- allow axle movement to have good ground contact
axles are stabilized against braking and acceleration forces by:
longitudinal torque rod
the function of a transverse torque rod
provide side to side stability
function of a vertical drive pin
allow the saddle to go up and down, as the load cushions deflect
four factors that accelerate frame stress/ cracking
- over loaded
- uneven load
- rough roads
- loose or warn crossmember attachment bolts
reason for using washers on frame
- to prevent the bolt from digging into frame
- to spread the load
list reasons for air bags to bottom
- overloaded
- low system pressure
- air spring cut or puncture
- bad adjustment on ride height control valve
- faulty ride height control valve
explain a spoke rim
- spoke rims are supported by bearings
- and can be considered a type of hub
tires are match by checking the seize on the side of the tire wall. true or false
false - tires are matched by measuring the circumference or diameter
explain what to when inflating tires and working with rims
- get training
- follow direction
- ask for help if uncertain
explain what visual check you should do before removing any tire assembly
inspect tire/rim/wheel for cracks, overheating, damage and mismatched parts
axles that cause the wheels to track parallel to the frame rails t al times is called
fixled axle
steering axles are used on some trailer units to:
help wit h tire scuffing when the trailer/tractor are negotiating tight turns
fifth wheel assemblies are rated based on the following four cosiderations
- towed vehicle weight
- max expected drawbar load
- vertical load to be carried by fifth wheel
- type of operation
list four faults that can be identified by visually inspecting a fifth wheel
- missing parts
- top plate wear
- rusting
- crack, bent, broken or damaged components
what two fifth wheel components should be lubricated with a light lubricating oil
- cam track
- rack and slide
two types of of landing gears
- drop leg
- gear operated
list 6 major areas of comercial vehicles that must be inspected
- couplers and hitch
- suspension
- tire and wheels
- brakes
- lamps and electrical systems
- body
identify five purposes of a predictive maintenance system
- maintain components at like-new standards
- reduce the possibility of unexpected failure
- increase component operating service life
- increase equipment safety and dependability
- increase trade in value
- meet warranty service intervals
identify four advantages of predictive maintenance
- increase productivity
- reduced maintenance cost
- reduce emergency and breakdown cost
- reduce secondary damage
- aids in schedule maintenance
