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挖掘机先导系统没有压力是怎么回事?

日期:2020-09-18   来源:http://www.dybocheng.com
若柴油机处于额定转速运转,先导系统没有压力,操作各先导操纵手柄,各执行机构均不运动,可按下列顺序分析检查:
If the diesel engine is running at rated speed and there is no pressure in the pilot system, operate each pilot control handle and all the actuators will not move. Analyze and check according to the following sequence:
(1)当柴油机额定转速运转时,用手摸先导油泵出油管,判断控制油泵有无排油。
(1) When the rated speed of diesel engine is running, touch the oil outlet pipe of pilot oil pump by hand to judge whether the control oil pump has oil discharge.
①若无排油,则由下述故障所致:
① If there is no oil drainage, it is caused by the following faults:
.液压油位太低。
. the hydraulic oil level is too low.
B.挖掘机倾斜严重,导致控制泵吸空。此时应设法使先导泵吸到油,再操作有关执行机构,使机器在较平坦的地方工作。
B. The excavator tilted seriously, causing the control pump to empty. At this time, we should try to make the pilot pump suction oil, and then operate the relevant actuator to make the machine work in a relatively flat place.
先导泵进油口堵塞。此时排除异物,使进油口畅通。
The inlet port of the pilot pump is blocked. At this time, remove foreign matters to make the oil inlet smooth.
若以上三种可能均已排除,则是齿轮泵损坏,应更换齿轮泵。
If the above three possibilities have been ruled out, the gear pump is damaged and should be replaced.
②若有排油,则应检查通向低溢流阀的滤油器是否堵塞。若滤油器己堵塞,应清洗或更换滤芯。
② If there is oil drainage, check whether the oil filter leading to the low relief valve is blocked. If the oil filter is blocked, clean or replace the filter element.
(2)若低压油能顺畅地流过滤清器,则应检查低压溢流阀和单向阀是否失效,即松动低压溢流阀并帽,一边调整低压溢流阀,一边观察先导压力表显示值有无变化。此时有以下几种情况:
(2) If the low-pressure oil can flow through the filter smoothly, check whether the low-pressure relief valve and one-way valve are invalid, that is, loosen the cap of the low-pressure relief valve and adjust the low-pressure relief valve while observing whether the display value of the pilot pressure gauge changes. There are the following situations:
长臂挖掘机租赁
①低压溢流阀弹簧折断或屈服。
① The spring of low pressure relief valve is broken or yielding.
②低压溢流阀阀芯堵塞,过早溢流。
② The valve core of low pressure relief valve is blocked and overflows early.
③齿轮泵磨损严重,内泄漏量过大,应更换先导泵。
③ Gear pump wear serious, internal leakage is too large, should replace the pilot pump.
④单向阀装反了或油口堵塞,应重新安装单向阀或清除油口异物。
④ If the check valve is installed reversely or the oil port is blocked, the check valve shall be re installed or the foreign matters in the oil port shall be removed.
(3)先导压力表显示值若正常,而全部先导控制油路仍无压力油,则有以下两种情况:
(3) If the display value of pilot pressure gauge is normal and there is no pressure oil in all pilot control oil circuits, there are two situations as follows:
①压力表管口至各先导阀进油口之间有异物。
① There is foreign matter between the pressure gauge nozzle and the oil inlet of each pilot valve.
②压力表损坏,压力表显示值为虚假值。
② The pressure gauge is damaged and the display value of the pressure gauge is false.
(4)先导压力表显示值若正常,而部分先导控制油路无压力,则有下面三种情况:
(4) If the display value of pilot pressure gauge is normal and some pilot control oil circuits have no pressure, there are three situations as follows:
①对应无先导油压的先导弹簧折断或屈服,使先导阀芯不能换向;应更换先导弹簧。
① The corresponding pilot spring without pilot oil pressure breaks or yields, so that the pilot valve core can not be reversed; the pilot spring should be replaced.
②对应无先导油压的先导阀粘结,不能换向:应修理或更换先导阀芯。
② The corresponding pilot valve without pilot oil pressure is stuck and cannot be reversed: the pilot valve core should be repaired or replaced.
③先导阀芯磨损严重,泄漏量过大,造成先导阀换向时先导压力大幅度下降;应更换先导阀芯或先导阀。
③ The pilot valve core is seriously worn and the leakage is too large, which causes the pilot pressure to drop greatly when the pilot valve is reversing; the pilot valve core or pilot valve should be replaced.

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