190302aB

Question 1

What kind of hyd steering system is on a skid steer?

Answer 1

closed loop system

Question 2

characteristics of the steering pump on a skid steer?

Answer 2

reversible, variable displacement piston pump. hydrostatic pump

Question 3

Characteristics of a hydrostatic pump?

Answer 3

swashplate can go to zero angle (neutral)
swashplate can go overcentre

Question 4

characteristics of a hydraulic motor on a skid steer?

Answer 4

swashplate can’t go to zero angle, can’t go over centre

Question 5

When is max torque created between the pump and the motor from swash plate angle?

Answer 5

pump swash plate minimum angle, motor swash plate max angle

Question 6

when is max speed created between the pump and motor from swash plate angle?

Answer 6

pump swash plate max angle, motor swash plate min angle

Question 7

What is the directional control valve used for on a skid steer?

Answer 7

lift cylinders, bucket cylinders, aux attachments

Question 8

What are the pressure controls used on a skid steer?

Answer 8

dcv relief, charge pressure relief, steering system relief

Question 9

Where are the case drain circuits?

Answer 9

on the steer pump and steer motor. allow leakage oil to go back to tank

Question 10

what micron rating is the spin-on filter for a skid steer?

Answer 10

10 micron

Question 11

machines that use a skid steering system have all wheels, or both tracks fixed in a straight ahead position
T or F

Answer 11

T

Question 12

How does the hydraulic pressure in the steering system act as a service brake?

Answer 12

the joysticks are spring-loaded to a central position when operator releases pressure on the control

Question 13

What is the major cause of hydraulic steering system problems related to?

Answer 13

contaminated hydraulic oil

Question 14

When do contaminants typically enter the system?

Answer 14

when the hyd oil/filter is being changed, as well as when aux connections are being used

Question 15

A hydraulic oil charge pressure circuit delivers low pressure hyd oil to the hyd steering pump. in addition, oil is supplied to the control valve to activate the hyd attachments
T or F

Answer 15

true

Question 16

The hyd steering pumps and hyd drive motors used on a skid steer machine generally operate in a closed loop system
T or F

Answer 16

true

Question 17

Leakage oil within the hyd pumps and hyd motors is returned to the hyd reservoir via the:

Answer 17

case drain circuits form each component

Question 18

what is included on the final drive system on a skid steer?

Answer 18

gears, chains, hyd motors