Item

Symptom

Reason

Solution

1

Oil spill

1. Rubber sealing parts broken or aged

2. Ficture bolts stress uneven or not tighten

1.Change rubber sealing

2. Tighten the bolt evenly

2

Calculate inaccurate

1. Attrition of plunger or valve plate

2. Attrition of steel ball

1. Change plunger or valve plate

2. Change steel ball