The leakage of Volvo 55 hydraulic pump consists of two parts:
1 part of the pump oil, the main part of the pump is to pay attention to the gap between the five pairs of friction.
The seal of the pump gallbladder and the oil distribution surface.
The seal of the pump cover and the back of the matching oil tray.
The clearance between the plunger and the pump hole is determined by the diameter of the plunger. The general diameter 25mm is 0.025mm-0.035mm and the wear limit is 0.06mm.
The seal of the plunger slipper plane and the inclined plate plane.
The wear vector of the worn shaft vector of the plunger head and the sliding shoe is 0.3mm.
Repair of 2 servo variable mechanism
For example, the gap between pump plunger and pump shell hole is 0.015mm-0.03mm.
More than 0.05mm repair is needed (with the seal ring separately), and check the fit gap between the lift valve core and the valve sleeve, generally 0.01mm-0.02mm..
More than 0.04mm is needed to repair, otherwise it will affect the pump flow, temperature or power regulation.
