Hydraulic Pump Service 190301c

Question 1

A reversible pump means it is able to do what exactly ?

Answer 1

Reverse the direction of oil flow through the pump.

Question 2

As pump outlet pressure increases the pumps internal leakage___________

Answer 2

Increases.

Question 3

Oil that gathers in the case of a axial piston pump comes from ?

Answer 3

Internal leakage.

Question 4

What are three general guidelines that should be followed when taking a pump apart ?

Answer 4

1. Mark pump housings.
2. Determine the correct direction of driveshaft rotation.
3. Be sure to keep mated components together.

Question 5

Most common cause of pitted erosion on internal surfaces is ?

Answer 5

Cavitation.

Question 6

What are thee ways a pump can lack in lubrication ?

Answer 6

1. Improper oil used.
2. Low reservoir oil level
3. Sever aeration (possibly over speeding)

Question 7

Four tasks that should be done when a pump is installed to ensure the system is clean enough ?

Answer 7

1. Oil may need to be changed or filtered.
2. Change the filters.
3. Reservoir cleaned thoroughly.
4. Complete system flush.

Question 8

What are several things to consider when analyzing hydraulic motor failure:

Answer 8

1. The condition of each motor part.
2. Type and condition of oil and filters.
3. Operating conditions and symptoms before failure.
4. Conditions of other hydraulic system components.
5. Severity of job application.
6. How long the motor has been in service before the failure.
7. Previous failures and repairs to the system.

Question 9

Four start up procedures that should be done after a new motor is installed are ?

Answer 9

1. Back off system pressure controls.
2. Operate motor at no load and check for leaks or unusual noises.
3. Apply load to the motor and warm up the oil, adjust system pressure controls.
4. Perform operational tests to confirm machine is working correctly.