First, the truck crane does not work Fault phenomenon:
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Second, the lifting capacity decreased, obviously fail to meet the requirements
First, the oil pump does not work. The first thing to check is whether there is 6/7 pressure in the vehicle's air pressure, whether the power take-off switch and the solenoid valve are energized, and whether the power take-off air path is ventilated. Many reasons are because the power lever is not pushed into place and only the power lever is needed. Push to place can be solved; then there is damage to the gear inside the box, this is too much trouble, need to overhaul the power box; take the power box output shaft and the oil pump input shaft between the drive sleeve damage, must replace the drive sleeve; oil pump burning Dead, must replace the oil pump.
Second, the oil pump works, the crane speed is slow when fast. Insufficient oil in the tank, add enough hydraulic oil; the oil filter is blocked and the oil filter needs to be cleaned.
Third, the hydraulic system pressure is too low. Leakage occurred in the system. Check all the pipes of the truck-mounted crane and parts of the truck-mounted crane and take measures to stop the leakage. The pressure of the overflow valve is adjusted too low. Check the pressure setting of the relief valve (The specified relief valve setting pressure is 14 Mpa. (2~3 tons of crane)/17.5Mpa (5~8 tons of crane) Over-regulation is not allowed) If the relief valve loses pressure regulation, check the overflow valve and replace damaged parts; Replace the oil pump.
Fourth, the amplitude of the cylinder is weak. Damage to the sealing ring in the cylinder has caused the internal leakage to increase, replacing the damaged seal and the piston; the piston in the variable cylinder has been damaged or deformed due to the cylinder cylinder of the cylinder, resulting in large internal leakage and checking whether the cylinder is deformed.
Fifth, check whether the cylinder deformation.
Sixth, Dongfeng truck lifting winch can not lift the volumetric efficiency of the plunger oil motor. Replacement of the oil motor cargo naturally drops (more than 2mm/min) after lifting. It can be clearly seen that the variable piston rod is pulled out, the movable arm and the leg are significantly retracted, and the lifting hook is naturally declining. Luffing cylinder, telescopic oil leaking cylinder, internal leakage of outrigger cylinder, replacement of damaged seals and pistons; destruction of balance cylinder and telescopic cylinder balance valve, replacement or overhaul of balancing valve; damage to bi-directional hydraulic lock at the outrigger, replacement or Overhaul of two-way hydraulic locks; reduced volumetric efficiency of the hoisting motor, damage of the friction brake pad in the winch gearbox, replacement of the friction brake pad and the motor.
