1. Please check out the level of the oil in the pump. If the oil is not enough, the pressure cannot go up.
2. Please check out whether the oil is clean or not. The impurity and iron scrap will stop the oil flowing and down the pressure.
3. Please check out the sealing systems after changing clean oil.
The methods of check hydraulic pumps are suitable for hongli hydraulic pipe groovers and hydraulic pipe cutters and some other hydraulic tools.
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