For hydraulic mechanical transmission way of ZL series loaders, most devices have cut-off valve switch ( The dashboard is located in the cab) 。 We in the repair process of loader, often found that the valve has been removed; Even if it is in, by the operator to understand, also don't know how to apply, useless. The main reason is to cut off the valve switch chassis tandemly loader transmission between the gas path, and thus is often recognized. Actually, whether the normal application of cut-off valve switch, about to ensure that the loader driving safely, prolong the using life and progress are important economic benefits. Must correctly grasp the function of the cut-off valve switch, use the opportunity and the way. 1, the function is the function of the cut-off valve switch is connected or cut off related pipings double air brake valve to variable speed control valve on the gas path between the cut-off Industrial Valves. 2, use the opportunity when the loader driving on flat ground or job, cut-off valve switch should be placed on & other; Through & rsquo; Position. So, when the air brake valve under the pedal, gas path through; High pressure gas from air brake valve, 0. 45 ~ 0. 65 MPa） , a local to gas-liquid brake total pump, another local after cut-off valve switch, into the cross cut-off valve of the speed control valve control cylinder; Cylinder piston restraint of the return spring tension, promote cut-off Industrial Valves stem moved forward, cut off shift oil, backcross speed device of the high pressure oil sump, shifting clutch friction plate separation, transmission and to cut off the power. Cut off the transmission of power when braking, can make the mechanical brake flexible, effect is good, frugal fuel. When the loader on the ramp, or homework, cut-off valve switch should be placed on & other; Cut & throughout; Position. So, when the air brake valve under the pedal, because of the gas circuit cut off, local high pressure gas from air brake valve, not through cut-off valve switch, cut-off valve control cylinder piston also can't reach, cut off the valve stem stationary, shifting oil is normal, clutch still working status, delivery speed, hanging gear. Braking when the transmission of power cannot be cut off, when loosen the brake pedal, machinery can hasten to start; When during the parking ramp, also can effectively prevent mechanical phenomenon of sliding slope, guarantee the mechanical driving or job. 3, using the way to the left pull & other; Through & throughout; （ On the brake pedal, the shift of the oil pressure gauge pointer hurtling to zero) ； Pull to the right & other; Cut & throughout; （ On the brake pedal, the shift of the oil pressure gauge pointer is still pointing in the direction of normal value 1. 1 ~ 1. 5 MPa） 。
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