electrohydraulics

Question 1

what are the two categories of electrohydraulics

Answer 1

electrically controlled systems and electronically controlled systems

Question 2

why are electrically controlled systems considered to be high voltage

Answer 2

because they use full battery voltage to control the system

Question 3

what is a discrete solenoid

Answer 3

on or off

Question 4

when troubleshooting for electrical faults what should you check first

Answer 4

battery voltage

Question 5

relays

Answer 5

reduces control circuit current flow

Question 6

solenoids

Answer 6

creates the force required to operate hydraulic components

Question 7

wiring harnesses and connectors

Answer 7

used to connect the system components and carry current flow

Question 8

control switches

Answer 8

provides means for the operator to initiate system operation

Question 9

the main disadvantage of electrically controlled hydraulic systems is that they are not able to

Answer 9

provide variable speed control

Question 10

what is the function of the bucket kick out on a wheel loader

Answer 10

hold the bucket control lever in the roll back position until the bucket reaches the correct digging position

Question 11

when the detector plate is in close proximity to the bucket kickout switch the switch is

Answer 11

closed

Question 12

loader bucket kickout position and lift height can be adjusted by

Answer 12

adjusting the position of the proximity switch in relation to the detector plate

Question 13

what is the function of input devices in a electronic controlled system

Answer 13

to send information in the form of electrical signals to the ECU

Question 14

what is an example of s discrete reference voltage sensor

Answer 14

a switch

Question 15

lever operated potentiometers that are used as operator controls are called

Answer 15

joysticks

Question 16

what are two types of joystick configurations

Answer 16

single and dual axis

Question 17

what is the function of a clamping diode

Answer 17

to dissipate the current flow created by inducing voltage in the solenoid coil when the operating switch is opened . preventing arching damage to the relay

Question 18

what is one of the main difference between electronically and electrically controlled systems

Answer 18

electronically controlled systems utilize less than full system voltage

Question 19

microprocessor

Answer 19

is a device that takes information sent to it from input components and compares it to parameters established in an internal memory

Question 20

what are the two categories of input devices

Answer 20

reference voltage sensors and voltage generating sensors

Question 21

what are the two types of voltage generating sensors

Answer 21

rotating permanent magnet and reluctance voltage generator

Question 22

what is hysteresis

Answer 22

when a directional control spool requires more current on one end than the other to move the spool

Question 23

what is one way to control hysteresis

Answer 23

with dither

Question 24

what is dither

Answer 24

constant vibration of a spool to allow for easier start movement of the spool