1. It is necessary to know that there are various reasons for the hydraulic pump of the road roller not pumping oil, so the solutions to different reasons are also different. If the oil pump coupling is loose or damaged, just loosen and re-tighten it; if it is damaged, check whether the hydraulic pump shaft is also damaged, and if it is damaged, replace it with a new one in time.

2. If the hydraulic pump does not pump oil due to the blockage of the oil suction filter, the blockage should be removed, and the filter should be replaced if necessary.