1、每运转500小时，应松开密封座上螺塞，用注射器抽出腔内剩余机油；向密封腔内加注合格的20号机械油至腔内一半的容积（加机油量适宜的检查办法：运转油泵，机油不向外冒出即可）；螺塞拧紧一方泄露现象发作。

2、发现电机机械噪音加大和轴承处温升异常时，应检查电机轴承光滑状况。如光滑脂变色、变脏应及时改换。

3、当发现密封座有漏油现象时，能够松开密封座上螺塞，运转油泵，有油向外冒出并有航空油料滋味时即可断定：机械密封失效。定制运用该管道泵以便快速改换机械密封。

4、改换失效的机械密封的办法：

1）准备好放置泵零件的工作台（空中）及拆装工具，切勿恣意乱放乱用，以免碰坏泵零部件。

2）拆前确认电机处于检修状态，拧下加油螺塞，用吸管把密封座腔内的光滑油吸出。

3）拆对分式联轴器；先把联轴器的固定内六角螺钉拧下，在悄悄把联轴器的一半从轴上渐渐拉下（留意不要掉下来）。用梅花扳手拧下泵轴吊紧螺栓和挡块，让叶轮渐渐下沉至泵体，拆下另一半联轴器，拿下泵轴挡圈。

4）拆密封座：拧下密封座压紧螺母，悄悄卸下密封座（留意：不要弄破座上橡胶油封）并清洗。

5）拆卸并清洗轴承座：先悄悄松动一下轴承座后用拆卸螺栓顶起轴承座，并沿着泵轴往上提而卸下：用喷气燃料清洗轴承及座装前晾干并涂少许20号机械有光滑维护。

6）拆卸机械密封：抓住密封弹簧顺着泵轴往上提，就能拆卸。

7）接卸密封配置：在动、静环境面上涂一层干净的20号光滑油：导轴承座抹上光滑油，先把静环悄悄定位装入导轴承座;再在泵轴上抹上光滑油，把机械密封的动环局部悄悄装入泵轴上，用手轻推密封环应能伸缩自若（留意动、静环局部的防转部位需装配到位）。

8）装密封座：密封座上先装入橡胶油封，再把密封座装入泵盖并压在轴承座上，拧紧螺母。

9）装联轴器：先在电机轴头上装上挡圈，装上一半联轴器，再在泵轴端和联轴器槽内装上挡块并用梅花扳手拧紧螺栓（吊起泵轴3~5毫米并提供机械密封预应力）；再装上另一半联轴器上内六角螺钉必需拧紧。装置联轴器正确的检查请求：对分式联轴器上下间隙平均;用手盘动联轴器数圈检查转动灵敏。

      10) 按运用要点试运转检查改换机械密封能否正确，泵组能否正常运转。

1, each 500 hours of operation, should loosen the seal seat on the screw plug, with a syringe out of the cavity remaining oil; Fill the sealed chamber with Qualified No. 20 mechanical oil to the cavity half of the volume (add the right amount of oil check method: running the oil pump, oil can not be out) ; plug tightening side leakage occurs. 2, found that the motor mechanical noise increased and abnormal temperature rise at the bearing, should check the motor bearing smooth condition. Such as smooth grease change color, dirty should be changed in time. 3. When oil leakage is found in the sealing seat, the screw plug on the sealing seat can be loosened, the oil pump can be operated, there is oil coming out and the taste of aviation fuel can be concluded: mechanical seal failure. The pipe pump is customized to quickly change the mechanical seal. 4, change the failure of the mechanical seal: 1) ready to place the pump parts of the worktable (air) and disassembly tools, do not wantonly use, so as not to damage the pump parts. 2) make sure that the motor is in repair condition before disassembling. unscrew the oil-filling screw plug and suck out the smooth oil in the sealing seat cavity with a straw. 3) split coupling; first the coupling of the fixed hexagon screw down, in the coupling quietly half from the shaft gradually pull down (pay attention not to fall off) . With a spanner screw down the pump shaft lifting bolts and block, so that the impeller gradually sink to the pump body, remove the other half of the coupling, take down the pump shaft block ring. 4) remove the seal block: tighten the nut off the seal block, quietly remove the seal block (Note: Do not break the rubber oil seal on the block) and clean. 5) remove and clean the HOUSINGS: quietly loosen the housings, then lift the housings with remove bolts and lift them up along the pump shaft: Clean The housings and housings with jet fuel before drying and painting a little no. 20 machine for smooth maintenance. 6) remove the mechanical seal: Grab the Seal Spring and lift it up the pump shaft to remove it. 7) joint and discharge seal configuration: In the dynamic and static environment surface coated with a clean layer of No. 20 smooth oil: guide bearing seat coated with smooth oil, first quietly positioning the static ring into the guide bearing seat; then in the pump shaft coated with smooth oil, the mechanical seal of the dynamic part of the ring quietly into the pump shaft, with the hand to push the seal ring should be able to stretch freely (pay attention to the dynamic and static ring part of the anti-rotation parts to be installed in place) . 8) install seal block: Rubber oil seal is first installed on the seal block, then the seal block is installed in the pump cover and pressed on the bearing block, tightening the nut. 9) mounting coupling: First install the retaining ring on the motor shaft head, then install the half coupling, then install the retaining block on the pump shaft end and the coupling slot and tighten the bolts with the plum wrench (lifting the pump shaft 3 ~ 5 mm and providing the mechanical seal prestress) ; then install the hexagon screws on the other half coupling must be tightened. Correct inspection request for device coupling: average clearance between the top and bottom of the split coupling; check the rotation sensitivity with the number of turns of the handplate coupling. 10) according to the operating points of the test run to check whether the replacement of mechanical seal is correct, whether the normal operation of the pump group.