Hydraulic Accessories A

Question 1

Reservoir function

Answer 1

• warms or cools
• de aerated fluid
• settles out contaminants
• reduces turbulence
• acts as a platform

Question 2

Coolers/heaters symbols

Answer 2

-arrows point in direction of heat (energy transfer either out/away for cooler or in for heater)

Question 3

Size of reservoir

Answer 3

-2-3 times the rated capacity of the pump

Question 4

Reservoir types

Answer 4

• open or vented to atmosphere
• pressurized like most we see
• closed circuit when return flow goes back to pump.

Question 5

Reservoir Mounting styles

Answer 5

• flat top
• L-shaped
• overhead stack best for cavitation
• vertical mount

Question 6

Functions of hydraulic fluid

Answer 6

• transfers energy
• lubricate
• seal
• carries heat away
• flushes contaminants

Question 7

Know how to read ISO range code

Answer 7

-2,5,15 particle count per ml

Question 8

Contamination

Answer 8

• causes 80% of component failures

- new oil, built in (assembly), ingressed (leaks, adding oil, etc…), generated (heat, wear)

Question 9

Filters vs. Strainers

Answer 9

• filters have elements, a bypass valve and a bypass indicator
• strainers wire screens

Question 10

Beta ratios (know the calculations)

Answer 10

-beta 10 would be 10 over 1, beta 300 would be 300 over 1

Question 11

A good breather

Answer 11

-3 micron filter

Question 12

Most seseptible to contaminants

Answer 12

-servo and proportional valves