Hydraulics

Question 1

Hydraulic fluid does what 4 things

Answer 1

• Transmit power
• Cools parts
• lubes parts
• seals clearances

Question 2

AW32 stands for?

Answer 2

Anti-wear 32 weight/viscosity

Question 3

WR46 stands for?

Answer 3

Wear resistant 46 weight

Question 4

EP32 stands for

Answer 4

Extreme pressure 32 weight

Question 5

R&O stands for?

Answer 5

Rust & oxidation

Question 6

The temperature where vapors ignite with an ignition source but does not sustain a flame

Answer 6

Flash point

Question 7

The temperature at which the vapor can sustain a flame with an ignition source

Answer 7

Fire point

Question 8

The temperature at which a fluid ignites with no ignition source needed

Answer 8

Auto ignition

Question 9

Hydraulic fluid is typically made from 2 different types of bases

Answer 9

Water
Synthetic

Question 10

Morg oil is what type of hydraulic fluid?

Answer 10

Invert emultion fluid

*phase separation is when the water separates from the oil due to excessive pressure.

Question 11

Check valve around a flow control is known as what?

Answer 11

By-pass check

Question 12

A check valve that will support a load

Answer 12

Pilot operated check

Question 13

A check that prevents back flow from the pump

Answer 13

Backflow check

Question 14

3 types of accumulators

Answer 14

•weighted
•spring
•hydro-pneumatic

Question 15

Functions of an accumulator

Answer 15

•develope flow
•maintain pressure
•absorb shock

Question 16

D03, D05, D07, D08, D010 All notate DCV mounting patterns and port sizes the larger the number the bigger the ports.

Answer 16

That’s it, I couldn’t think of a question.

Question 17

4 ways to control a DCV

Answer 17

•Mechanically
•Manually
•Electrically
•Pilot

Question 18

A center condition where A&B can flow back to tank and pressure is blocked.

Answer 18

Float

Question 19

A center condition where all ports are blocked

Answer 19

Blocked

Question 20

A center condition where all ports are open.

Answer 20

Open

Question 21

A center position where pressure and tank are connected and A&B are blocked

Answer 21

Tandem

Question 22

A symbol for hydropneumatic accumulator

Answer 22

Image attached

Question 23

Symbol for weighted accumulator

Answer 23

Image attached

Question 24

Symbol for spring accumulator

Answer 24

Question 25

A drain in a DCV so it can drain off excess fluid from pilot operation

Answer 25

Y DRAIN