Second hand 90L075 hydraulic pump for construction machinery house

Second hand 90L075 hydraulic pump is the best selling hydraulic knowledge in our country: there are two kinds of situation: flat plate valve and spherical valve.

Spherical flow of friction pairs, the cylinder surface is shallow scratches, through the grinding ability to repair; the cylinder surface deep groove, should accept the appearance of engineering skills "ability to fill the groove, then hold grinding, not blindly grinding, to prevent the copper layer becomes thin or leaking out of steel base.