Hydraulics

List three functions of a hydraulic tank

• Store oil

• Release heat

• Deaerate oil

• Increase flow

List two reasons why hydraulic tanks are sometimes pressurised.

• Give pump good head of oil

• Help cooling

• Create cavitation

• Reduce contamination

What must you do before working under a hydraulically suspended load?

• Lower load if you can

• Engage safety brace

• Support load mechanically

• All of the answers are correct

List two ways contamination can enter a hydraulic tank.

• When topping up

• Pump

• Through breather

• Motors

What does a Safety Data Sheet tell you?

• First aid for personal exposure

• First aid for firefighting

• First aid for environmental spills

• All of the answers are correct

What ways can pressure is produced in a hydraulic system?

• Heat, load, accumulator

• Load, pump, accumulator

• Pump, load, directional control valve

• All of the options are correct

Before servicing a hydraulic system what three steps must you take before starting work?

• JSEA Risk assessment

• Isolation

• Safety Data Sheet

• Depressurise

Which 20 micron filter below has a better Beta rating?

• 20/ 100

• 20/ 5

• 20/ 20

• 20/ 1000

Which ISO cleanliness code below has the most 14um particles?

• 18/16/13

• 21/19/18

• 17/16/11

• 18/14/15

With regard to safety, before removing an oil filter on a hydraulic system, what should you check?

• Oil level

• Tank pressurised

• Type of oil

• Part number