Type forklift CPCD60 using ZS series, sub-chip multi-way valve, the valve including the shell, or stem from, tilt stem, reset spring safety valve, as well as components such as cone-shaped valve, into the oil formation in the internal Road, the working oil Road, back to the oil that spills Road and Road, the total back to the oil, so that hydraulic oil in different working conditions, Road in the oil flow to the work of a different purpose. Valve into the oil which has a mouth and into the oil pump system connected to the oil valve oil return system back to the mouth and the oil port connection, safety valve (relief valve) to control oil spills Road. CPCD60 type forklift hydraulic system rated pressure 16Mpa, flow 160L/min.
Multi-way valve leakage is the most common fault.
1, with the leakage
Multi-way valve leakage occurs, the working oil Road and back to oil spills Road Road or heart, and hydraulic oil tank directly back to complete the operation, resulting from or inability to hydraulic lifting cylinder or lifting cargo fork down and the door frame itself forward on its own, such as failure. Leakage within the cause and rule out the method is:
(1) with the valve stem is too large gap between the wear and tear
Multi-way valve lift and tilt of the stem on each of the three grooves, groove and oil Road can be connected with or cut off the circuit to change the work. Good distribution of the valve stem with a small gap between the valve body, very little oil, so a drop or tilt hydraulic cylinder is very small, does not affect the work. However, excessive wear and tear clearance, the hydraulic oil pump in the workplace under pressure, it will result in oil Road back to the oil and oil spills Road Road or similar, automatic return to the tank. The cause is mainly due to the allocation of long-term use of valves or dirty oil, such as the stem and the valve body to speed up the wear and tear with damage to the sealing surface, resulting in oil spills. Repair minor wear and tear if the stem may be polished chrome-plated stem; if stem serious wear and tear, it needs to be replaced.
(2) between the oil body
Road as a result of the oil return to the oil that spills Road runs through the body between the three single-chip, so the seal between the valve body require, Body Oil and Body Road after installation O-ring, with bolts to connect the valve body from Wild to the purpose of sealing.
If the solid bolt torque different body may lead to warpage. Seal failure, resulting in leakage; performance if the body installed O-ring damage or aging or damage, in the oil under the valve body is also prone to leakage between. Repair, if the need for grinding valve damage, the replacement of O-ring, and the order and bolt tightening torque requirements.
(3) safety valve spring failure
Safety valve for regulating the system pressure, the pressure to maintain a certain range to prevent overloading and hydraulic cylinder piston position to the limit or for other reasons, the hydraulic system caused by damage to the components. Safety valve will be primarily by elastic spring ball pressure reached in the open valve position, the purpose of clearance. When the hydraulic pump output exceeds the set value, the high-pressure oil to overcome some of the pressure on oil by high-pressure safety valve to return oil tank Road. When the oil is up to the required value, the spring preload in the role of their own, the ball will be pressed in the valve position, the safety valve to close.
If the safety valve spring failure, hydraulic oil pressure below the system requirements can be forced to leave the ball valve inflow of oil spills that resulted in leakage, the system failure. Spring must be replaced when the repair, and then use the adjustment screw to adjust the spring pressure on the provisions of 14 Mpa. Adjustment from the load center in accordance with the demand for 600mm Department 7.5t load of goods, when goods may from time to time from the non-locking with locking nut, the pressure at this time is the need to adjust the pressure.
(4) multi-way valve can not be reset under
Stem reset spring installed in the bottom of the stem, regardless of stem position in the top or at the next spring can be compressed so that, in the absence of external force, due to the elastic spring to make stem the rapid return to its original location. If the stem can not be reset, Trench Road, connected with the oil will be produced within the leak. First, as a result of stem deformation or damage to reset the spring, spring can not reduce the elastic stem back in situ, to be replaced to repair the spring; second valve between the unclean and the stem, have a greater resistance to stem reduction difficult, repair to be cleaning the internal multi-way valve to eliminate the resistance.
(5) cone valve wear
Cone oil is used to prevent backflow valve. If the cone valve wear, oil clearance Mission Road, lax, the hydraulic oil will return to system failure. Repair, should be into the grinding or replaced. The elimination of the return.
2, valve oil leakage
Valve stem seal and O-ring on to achieve, if aging or damaged seals, in the system of hydraulic oil under pressure will flow along the stem, resulting in leakage of the oil body. Simply rule out the possibility that this failure to replace the O-ring.
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