1)The first kind of packing without exception:
1. In the low pressure oil pressure when not leak, causes assembly surface roughness is poor, - - - - - to improve the surface roughness of 3.2 ~ 6.3 umry with hardness lower seal
2. The piston rod of oil ring bigger, every stroke will drop a few drops of oil, causes shield of lip scrape oil film change dust ring type.
3. At low temperature heat leakage not leak, cause there are two one is eccentric too big a kind is packing material choose not appropriate, choose hardy of seal can solve the problem.
2)The second type seal is not normal:
1. The main oil seal surface hardening, sliding surface have burst; Reason - - - - - abnormal high pressure is too high.
2. The main oil seal surface hardening, the seal oil seal rupture, broken to pieces; Reasons - hydraulic oil metamorphic oil temperature anomaly rise produce ozone damaged seal and produce oil leakage.
3. The main oil seal surface wear like mirror as smooth; Reasons - micro time pressure is too high stroke tiny.
4. The main oil seal surface mirror wear uniform packing have dissolved rise now like; Reasons - lateral pressure big eccentric is too large, with the bad oil and cleaning fluid.
5. The main oil seal sliding surface has damage and grinding crack; Reasons - plating is poor, have rust point matching surface roughness piston rod choose unsuitable material, containing impurities.
6. The main oil seal lip top have broken scar indentation; Reasons - assembly chamfering undeserved, installation, stored in a wrong way.
7. The main oil seal sliding surface pressure mark; Reasons - has foreign sundry.Eight. The main oil seal lip have crack fracture; Reasons - oil is undeserved, working temperature on the high side or low back pressure on the high side speed is too high, too much pressure pulse frequency.
9. The main oil seal has burned carbide metamorphism; Reasons - residual air produce adiabatic compression.
10. The main oil seal heel extrusion have crack; Reasons - pressure is too great, extrusion clearance is too large, bearing ring used for when, installation groove design is not reasonable.