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常見(jiàn)問(wèn)題：

1.泵不出油
如果在主機(jī)調(diào)試中發(fā)現(xiàn)齒輪泵不來(lái)油，首先檢查齒輪泵的旋轉(zhuǎn)方向是否正確。齒輪泵有左、右旋之分，如果轉(zhuǎn)動(dòng)方向不對(duì)，其內(nèi)部齒輪嚙合產(chǎn)生的容積差形成的壓力油將使油封被沖壞而漏油。其次，檢查齒輪泵進(jìn)油口端的濾油器是否堵塞，會(huì)造成吸油困難或吸不到油，并產(chǎn)生吸油膠管被吸扁的現(xiàn)象。
2.油封被沖出
（1）力士樂(lè)齒輪泵旋向不對(duì)。當(dāng)泵的旋向不正確時(shí)，高壓油會(huì)直接通到油封處，由于一般低壓骨架油封zui多只能承受0.5MPa的壓力，因此將使油封被沖出。
（2）力士樂(lè)齒輪泵軸承承受到軸向力。產(chǎn)生軸向力往往與齒輪泵軸伸端與連軸套的配合過(guò)緊有關(guān)，即安裝時(shí)將泵用錘子砸或通過(guò)安裝螺釘硬拉而將泵軸受到一個(gè)向后的軸向力，當(dāng)泵軸旋轉(zhuǎn)時(shí)，此向后的軸向力將迫使泵內(nèi)磨損加劇。由于齒輪泵內(nèi)部是靠齒輪端面和軸套端面貼合密封的，當(dāng)其軸向密封端面磨損嚴(yán)重時(shí)，泵內(nèi)部軸向密封會(huì)產(chǎn)生一定的間隙，結(jié)果導(dǎo)致高低壓油腔溝通而使油封沖出。這種情況在自卸車行業(yè)中出現(xiàn)較多，主要是主機(jī)上聯(lián)軸套的尺寸不規(guī)范所致。
（3）力士樂(lè)AZPF型齒輪泵承受過(guò)大的徑向力。如果齒輪泵安裝時(shí)的同軸度不好，會(huì)使泵受到的徑向力超出油封的承受極限，將造成油封漏油。同時(shí)，也會(huì)造成泵內(nèi)部浮動(dòng)軸承損壞。
（4）長(zhǎng)時(shí)間吸空或半吸空，使泵內(nèi)齒輪端面和軸套磨損加劇，由于齒輪泵內(nèi)部是靠齒輪端面和軸套端面貼合密封的，當(dāng)其軸向密封端面磨損嚴(yán)重時(shí)，泵內(nèi)部軸向密封會(huì)產(chǎn)生一定的間隙，結(jié)果導(dǎo)致高低壓油腔溝通而使油封沖出。

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