移動式抽水(shui)泵(beng)(beng)車泵(beng)(beng)蓋分別與(yu)泵(beng)(beng)體(ti)和進(jin)水(shui)管相(xiang)接。泵(beng)(beng)蓋平面與(yu)葉輪平面之間(jian)(jian)應有適(shi)當(dang)間(jian)(jian)隙(xi)(xi)。間(jian)(jian)隙(xi)(xi)過小會(hui)產生摩(mo)擦；間(jian)(jian)隙(xi)(xi)過大，會(hui)導致泵(beng)(beng)體(ti)內的壓力水(shui)大量回流、使泵(beng)(beng)的效率降低。實際使用(yong)的適(shi)宜間(jian)(jian)隙(xi)(xi)為0.3-0.7mm（將泵(beng)(beng)軸推向泵(beng)(beng)的進(jin)口端），間(jian)(jian)隙(xi)(xi)可用(yong)增(zeng)減紙墊厚(hou)度來調整。