一辆太脱拉Ｔ８１５汽车上的手压泵︵型号为ＨＡ-３结构型式为手动柱塞式油泵︶工作时柱塞自动回缩不能泵油通常在排除此类故障时先检查泵体进油通道上的单向阀是否泄漏若泄漏更换新的钢球与阀座故障即可排除但检查该泵各部位不存在漏油和其它问题更换新 Hand pump on a TATRA T815 car (Model HA-3 is a manual piston pump) Automatic retraction of the plunger during operation  No pumping of oil  Normally  Exclusion of such faults  First Check if the check valve on the pump inlet leaks  If leakage  Replace with new ball and seat  Troubleshoot  But check all parts of the pump 漏 No oil spills and other problems  Replacement