Baoli CPCD 80 Operating And Servicing Manual
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Contents
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776.6 Tilt lock valve operationTilt lock valve is used for preventing the shaking of the mast (because the tiltcylinder maybe cause the inside negative pressure), at the same time, it can avoid thedanger that the mast will be tilted due to the wrong operation (hit the tilt operation staff)when the engine is off. In traditional structure, even if the engine is off, the mast will bepitch if someone hit the tilt operation staff. But using this new-style tilt lock valve, in spiteof the strength that push the tilt operation staff, this complexion will be not occurred. Tiltlock valve structure, see Fig.6.9. In the picture, the port A is connect with the front of thetilt cylinder and the port B is with the behind. When pull the tilt operation staff ( pull slidevalve), the oil that is come from the oil pump will be inpour A, and the oil that is comefrom B port will be back to Oil tank. As a result, the mast will be retroverted. On the otherhand, push the tilt operation staff (push slide valve), the oil that is come from oil pumpwill be inpour B, recur to the HP oil, the lock valve begin to work, then Port A canconnect with LP, the mast will be pitch. But when the engine is off, that is, have no HP oilmake the lock valve work, so Port A cannot connect with LP, and the mast will not bepitch, at the last, the tilt cylinder will not be cause the negative pressure.Fig. 6.9 Tilt lock valveT: to oil tank P: to oil pump A,B: to tilt cylinder |
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