裝載機(jī)制動(dòng)后掛不上擋的故障的分析與維修保養(yǎng)處理

The loader brake after hang on the block of the fault analysis and repair maintenance treatment

故障現(xiàn)象 制動(dòng)后，裝載機(jī)（ZL40型）突然不能行走，查看變速壓力表見指針指向零，但工作裝置和轉(zhuǎn)向系統(tǒng)工作正常。

Brake failure, loading machine (model ZL40) suddenly unable to walk, see shift pressure table pointer to zero, but working device and steering system is working properly.

故障分析 裝載機(jī)變速操縱閥裝有一個(gè)動(dòng)力切斷閥，通過它可以實(shí)現(xiàn)在踏下制動(dòng)踏板進(jìn)行制動(dòng)時(shí)，變速箱的換擋離合器能自動(dòng)分離，使傳給行走部分的動(dòng)力切斷。在非制動(dòng)狀態(tài)下，制動(dòng)閥桿在彈簧的作用下應(yīng)為上、下油道相通，閥桿封閉腔與油箱相通，由調(diào)壓閥來的壓力油經(jīng)上、下油道進(jìn)入換擋離合器工作缸，使換擋離合器可以接合。如果制動(dòng)閥桿卡死或彈簧不能回位，那么上、下油道被隔斷，由調(diào)壓閥來的壓力油就不能進(jìn)入換擋離合器工作缸，換擋離合器就不能接合，裝載機(jī)就會(huì)出現(xiàn)上述現(xiàn)象。閥桿卡死的原因一般多是液壓油過臟或是氣閥體內(nèi)Y型密封圈損壞造成的；彈簧不能回位多是由于彈簧變形彎曲或斷裂而造成的。

Fault analysis of loading machine speed control valve is equipped with a power shut-off valve, which can be achieved through the foot brake pedal brake and gearbox clutch can automatically separate, make to the walking part of the engine cut off. In the non brake state, brake valve stem under the action of the spring should be, under the oil channel is communicated, stem sealing cavity is communicated with the oil tank, the pressure regulating valve to the oil pressure, oil passage into shifting clutch working cylinder, clutch shift can engage. If brake valve stem stuck or spring can not back a bit, then, oil was cut off, by adjusting the pressure valve to the oil pressure can not enter the shift clutch working cylinder, shifting clutch is not engaged, loading machine will appear afore-mentioned phenomena. Stem card the cause of death is generally more hydraulic oil too dirty or is valve in the Y type sealing ring damage; spring can not back bit is caused due to the deformation of the spring to bend or break.

故障判斷與處理 遇上述現(xiàn)象，首先要判斷是制動(dòng)系的故障還是變速器的故障，可通過觀察變速壓力表的指針是否指向零來判斷。如果變速壓力表指針指在正常范圍內(nèi)，裝載機(jī)仍不能行走，說明故障出在制動(dòng)系上；如果變速壓力表指針指向零位，則說明故障出在變速操縱閥上。這時(shí)可將儀表盤上的動(dòng)力切斷閥開關(guān)，扳在不切斷動(dòng)力的位置上，然后加大油門，觀察變速壓力表指針是否上升，如不上升，可用鐵器輕輕敲擊變速閥體的表面，使制動(dòng)閥桿受振動(dòng)，在彈簧的作用下而自動(dòng)回位。如仍沒有排除故障，就必須把變

Fault judgment and disposal in case of the above phenomenon, first of all to judge is the braking system malfunction or transmission failure, through the observation of variable pressure table pointer directed zeros judgment. If the transmission pressure gauge pointer in the normal range, loading machine is still unable to walk, indicating a fault in the brake system; if the transmission pressure gauge pointer to zero, then the fault in the variable speed control valve on. At this time, the dashboard on the power shut-off valve switch, pull in do not cut off the power of the position, then stepped on the gas, were observed in transmission pressure gauge pointer is rising, such as do not rise, use the iron tapping the surface of the gear body, the brake valve stem by vibration, in the spring under the action of and automatic back. If there is no fault, it must change

速閥體部分全部拆下，清洗檢查，查明原因后進(jìn)行排除。

Quick dismantling all body parts, cleaning check, identify the reason for exclusion.

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