Manual hydraulic forklift l is not high, how to repair

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Early found that the forklift is not always rise to the highest place, resulting in unfavorable progress of work. After the investigation is following oil spill, the ca use can not rise to the highest point.
Oil spills are the most common multi-valve failure. Encountered such a problem, first do not worry, the analysis of reasons:
1, the internal leakage
Multi-valve internal leakage occurs, the working oil path connected back to the oil passages or oil spill Road, hydraulic oil back into the tank to complete the operation, resulting in the lifting hydraulic cylinder lifting unable or lifting forks on their own downturn and the door frame their own forward failure. Analysis and elimination of the internal leakage is:
(1) between the stem and valve wear gap is too large
Multi-valve lifting and tilting of the stem on each of the three grooves, the grooves and the oil passages with the connect or disconnect the oil, change ways of working. A small gap between the distribution of the valve stem and valve oil spills rarely, the hydraulic cylinder down or tilt is very small, does not affect the work. Wear gap is too large, the hydraulic oil in the working pump pressure will cause working oil channel in the oil and the oil return channel or spill Road connected, and automatically back to the tank. The main cause, accelerate the wear of the stem and the body due to the distribution valves for long-term use or fluid dirty, destroyed with the sealing surface, resulting in oil spills. Repair the valve stem wear lighter stem chrome-plated polished; if the stem is badly worn, you will need to be replaced.
(2) Valve between the oil spill
Working oil passages, oil return Road, oil spill Road runs through the three monolithic body, the valve between the sealing requirements, install the O-ring between the valve body and valve oil channel. the body with bolts from the Lai achieve the purpose of sealing.
If the solid torque bolts, may lead to warping body. Seal failure, the inner leakage; If the installation of injury or O-ring of the valve body performance to aging or damaged, the valve b etween the hydraulic effect, is also prone to leakage. Repair the body damage which need to be ground, replace the O-ring, according to the order and torque tighten the bolts.
(3) safety valve spring failure
The safety valve used to regulate the system pressure, so the pressure was maintained within a certain range to prevent damage to the parts in the hydraulic system overload, the hydraulic cylinder piston to limit location or other reasons. The main safety valve by the spring force to the ball pressure on the valve position to achieve the purpose of opening and closing. When the oil pressure of the hydraulic pump output exceeds the set value, the high pressure oil pressure to overcome part of the high pressure oil return to tank relief valve Oil Spill Road. When the oil pressure reaches the specified value, the spring preload of the role of the steel ball pressed on the valve position, the safety valve is closed.
If the safety valve spring failure, hydraulic oil under pressure below the system requirements can force the ball to leave the valve position into the oil spill Road, resulting in leakage, the system failure. Repair to replace the spring, and then use the adjustment screw to adjust the spring pressure to the provisions of 14 Mpa. Adjust the load when the demand from the load center of 600mm at 7.5t cargo, goods like from the non-starting with locking nut, this time the pressure is the need to adjust the pressure.
(4) multi-valve rod can not be reset
Stem return spring is installed in the lower end of the stem, regardless of stem can make the upper or in the next spring is compressed, in the absence of external force, because the spring will make the stem rapid return to its original position. If the stem can not be reset, the trench connected with the oil passages, will produce leakage. First, stem return spring deformed or damaged, the lower spring force and not make the stem back in place, repairs are required to replace the spring; between body and stem are dirty, have a greater resistance to stem Reset difficulties, internal multi-channel valve repair should be washed to eliminate the resistance.
(5) poppet valve wear
The poppet valve is used to prevent fluid backflow. If the cone valve wear, oil Road off Mission lax, the hydraulic oil will return, so that the system failure. Repair, response into the grinding or replacement. Elimination of reflux.
2, valve oil leakage
The sealing of the stem and the body rely on the O-ring seals aging or damaged in the system under pressure hydraulic oil will flow along the stem, leading to body oil leakage. Troubleshoot this, simply replace the O-ring can