frame suspension

Question 1

list the 3 functions of a vehicle frame

Answer 1

• provide platform for major vehicle components
• support the load it is carrying
• resist shock and torsion loads

Question 2

define the function of a vehicle cross-frame

Answer 2

provides strength and rigidity

Question 3

the term “section modulus” refers to..

Answer 3

• height
• width
• thickness
• shape

Question 4

list 4 functions of the suspension system

Answer 4

• 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

Question 5

axles are stabilized against braking and acceleration forces by:

Answer 5

longitudinal torque rod

Question 6

the function of a transverse torque rod

Answer 6

provide side to side stability

Question 7

function of a vertical drive pin

Answer 7

allow the saddle to go up and down, as the load cushions deflect

Question 8

four factors that accelerate frame stress/ cracking

Answer 8

• over loaded
• uneven load
• rough roads
• loose or warn crossmember attachment bolts

Question 9

reason for using washers on frame

Answer 9

• to prevent the bolt from digging into frame

- to spread the load

Question 10

list reasons for air bags to bottom

Answer 10

• overloaded
• low system pressure
• air spring cut or puncture
• bad adjustment on ride height control valve
• faulty ride height control valve

Question 11

explain a spoke rim

Answer 11

• spoke rims are supported by bearings

- and can be considered a type of hub

Question 12

tires are match by checking the seize on the side of the tire wall. true or false

Answer 12

false - tires are matched by measuring the circumference or diameter

Question 13

explain what to when inflating tires and working with rims

Answer 13

• get training
• follow direction
• ask for help if uncertain

Question 14

explain what visual check you should do before removing any tire assembly

Answer 14

inspect tire/rim/wheel for cracks, overheating, damage and mismatched parts

Question 15

axles that cause the wheels to track parallel to the frame rails t al times is called

Answer 15

fixled axle

Question 16

steering axles are used on some trailer units to:

Answer 16

help wit h tire scuffing when the trailer/tractor are negotiating tight turns

Question 17

fifth wheel assemblies are rated based on the following four cosiderations

Answer 17

• towed vehicle weight
• max expected drawbar load
• vertical load to be carried by fifth wheel
• type of operation

Question 18

list four faults that can be identified by visually inspecting a fifth wheel

Answer 18

• missing parts
• top plate wear
• rusting
• crack, bent, broken or damaged components

Question 19

what two fifth wheel components should be lubricated with a light lubricating oil

Answer 19

• cam track

- rack and slide

Question 20

two types of of landing gears

Answer 20

• drop leg

- gear operated

Question 21

list 6 major areas of comercial vehicles that must be inspected

Answer 21

• couplers and hitch
• suspension
• tire and wheels
• brakes
• lamps and electrical systems
• body

Question 22

identify five purposes of a predictive maintenance system

Answer 22

• 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

Question 23

identify four advantages of predictive maintenance

Answer 23

• increase productivity
• reduced maintenance cost
• reduce emergency and breakdown cost
• reduce secondary damage
• aids in schedule maintenance