Sauer Danfoss hydraulic piston pump repair

Sauer Danfoss hydraulic pump 90R series why the hydraulic pump shaft head seal seepage, leakage of oil? How should we exclude it?

1, Danfoss hydraulic pump shell pressure is too high, manifested as the shaft seal protrudes outward, conical. For Danfoss hydraulic pump, the allowable shell pressure for the absolute pressure bar, that is, the table pressure lbar. out of this data, there will be a series of problems, such as the plunger slide shoe off, return disc off, etc.. Generally speaking, the hydraulic pump drain tube is too thin, low oil temperature, oil viscosity is easy to cause high shell pressure.

2, Danfoss hydraulic pump whether the hydraulic medium is incompatible. For example, phosphate ester with nitrile rubber seal, the two occur chemical reaction. Performance is a flocculent at the leak.

3, Danfoss hydraulic pump whether the coupling is not installed, there is a lateral force, causing the shaft seal unilateral wear and oil leakage. The performance is that one side is obviously worn.

4、Whether natural aging.

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