190302aA

Question 1

What is a rigid frame?

Answer 1

a one piece structure

Question 2

what kinds of steering systems can be used on rigid frames?

Answer 2

two wheel, four wheel, skid steer

Question 3

how is directional control achieved in an articulated steering system?

Answer 3

pivoting the two machine sections at a point of articulation

Question 4

what are the different steering systems?

Answer 4

1. front wheel steer with or without wheel lean feature
2. rear wheel steering
3. four wheel steering: crab
   4.four wheel steering: co-ordianted
4. combination: front or rear plus crab and co-ordinated
5. skid steer

Question 5

what is wheel lean feature?

Answer 5

tilts the wheels to reduce the amount of constant input on the front wheel steering system

Question 5

what way does the grader tend to lean to when the blade is angled?

Answer 5

to the leading side of the blade

Question 6

benefit of rear wheel steering?

Answer 6

useful in confined spaces

Question 7

What is four wheel crab steering?

Answer 7

all four tires turn in the same direction and move on different paths over the ground

Question 8

benefits of crab steering?

Answer 8

provides max floatation

Question 9

what is co-ordinated (circle) four wheel steering?

Answer 9

rear tires turn on the same track as the front tires

Question 10

benefits of co-ordinated steering?

Answer 10

reduces effort of rear tires having to break new ground during steering

Question 11

benefits of combination steering?

Answer 11

can drive like normal on highway but on site can be very maneuverable and versatile

Question 12

when combo steering is used, the steering wheel normally controls which steering?

Answer 12

one steering axle, either front or rear steering

Question 13

what is skid steering?

Answer 13

the tires or track assembly on one side of the machine can drive at a different speed than the other side

Question 14

What machines are commonly articulated steer?

Answer 14

wheel loaders
motor graders
tractor scrapers
small haul trucks and rock trucks

Question 15

What is part time power steering?

Answer 15

power assist steering system. when operator holds steering wheel, the wheels turn at that specific angle.

Question 16

what is the amount of assist on a part time power steering system determined by?

Answer 16

amount of resistance that the steering tires encounter during a turn

Question 17

what is a full time power steering system?

Answer 17

provides operator with total power steering. when operator moves the steering wheel, the wheels will keep going

Question 18

what can prevent wheels from continuing to turn on a full time power steering system?

Answer 18

a follower valve

Question 19

what is unique about a full time power steering system?

Answer 19

there is no mechanical connection

Question 20

what would cause jerky hydraulic cylinder operation?

Answer 20

air bubbles being compressed during operation

Question 21

what do pressure control valves tend to operate under?

Answer 21

a system of balance

Question 22

what is a flow divider?

Answer 22

allows a specific amount of hyd oil to flow from main hyd pump to steering control valve and hoist control valve

Question 23

what could a dcv also be identified as?

Answer 23

a reversing valve

Question 24

what are two types of steering control valves?

Answer 24

HMU and spool type

Question 25

purpose of a steering cushion/stop?

Answer 25

limit max turning angle

Question 26

how is excessive impact loads prevented from being imposed on the steering cushions and the steering system?

Answer 26

hyd pressure in the steering cylinders is relieved just as max steering angle is reached

Question 27

how do adjustable steering stop screws work?

Answer 27

as the machine makes contact with the steering stop screw, it contacts a pressure control valve called a neutralizer valve

Question 28

what is the smallest micron size human eyes can see?

Answer 28

40 micron

Question 29

What are two types of filters?

Answer 29

surface and depth (spin on)

Question 30

how do the rear wheels track in relation to the front on an articulated wheel loader?

Answer 30

tend to move in the same track as the front tires during steering

Question 31

where is the point of articulation on a wheel loader?

Answer 31

at the centre of the machine

Question 32

how do the rear tires track in relation to the front on a motor scraper?

Answer 32

they move inside the track created by the front tires

Question 33

where is the point of articulation on a scraper?

Answer 33

nearer the front of the overall machine

Question 34

what is the cause of 70% of hydraulic failures?

Answer 34

hyd oil regarding selection, care, cleanliness

Question 35

is a kingpin required in a hydropneumatic suspension?

Answer 35

no, the cylinder acts as the pivot point

Question 36

why should you not use a hammer when removing the upper and lower pivot pin bushing caps?

Answer 36

it will deform the mating surfaces between the caps and steering knuckle

Question 37

main purpose of a tie rod?

Answer 37

maintain toe adjustment, correct toe adjustment

Question 38

secondary purpose of a tie rod?

Answer 38

transmit turning action to other wheel