Item

Symptom

Reason

Solution

1

Oil Spill

1    Sealing element broken or aged

2    Ficture bolts stress uneven or not tighten

1 Change Sealing

2 Tighten the bolt evenly

2

Negative pressure increase,low flow rate

Filter block

Clean or change the filter

3

No oil output

Floater float，no sealing of return hole

Adjust floater

4

Shock，loud noise

Graphite cover or bearing broken

Change graphite cover

5

Rotor get stuck

There are graininess impurities inside the pump

Clean the pump and rotor

6

Unusual pressure of outlet

Can not open the by-pass valve

Checking the by-pass valve