· The lifting leg of the truck is slow or does not move
1. Check if there is something wrong with the truck crane hydraulic system;
2. Check whether the lifting valve of the truck is able to reduce the set pressure due to loosening of the adjusting screw. Can the valve seat be damaged or dusty on the outside surface of the valve? Can the valve be stuck in the open position? Can the needle valve wear out and the spring can be deformed? Or damage, see the situation stop adjusting or repairing;
3, check the truck hanging valve, see whether the valve stem wear, whether the valve can be deformed or damaged, look at the situation with the change; Fourth, check the leg cylinder, see if the piston can get stuck, the piston rod can be bent, Look at the situation and change.
• Retract the cylinder rod when lifting the cylinder;
1. Check the pilot-operated check valve to see whether the seat surface is damaged or dusty, whether the valve or piston can be stuck in the open position, whether the spring is intact, and whether the O-ring can be in good condition. ;
2, check the leg lift cylinder to see if the sealed O-type can be damaged, the cylinder arm can scratch, see the situation with the exchange or repair.
· The outriggers stick out when the vehicle is lifted
1, check the manual control valve {for legs}, see whether the hydraulic control check valve seat surface damage or dust, hydraulic check valve can be stuck, the spring can damage, see the situation to stop repairing or with change;
2, check the leg lift cylinder to see if the seal O-ring can be damaged or worn, the cylinder arm can be scratched, see the status of repair.
· The lifting system of the truck crane is slow or does not move
1. Check if there is something wrong with the truck crane hydraulic system;
2. Check the truck lift relief valve;
3. Check the manual control valve on the crane to see whether the valve stem can wear out, whether the valve can be damaged inside or not. See the situation and stop repairing;
4, check the truck crane slewing reducer to see if the gear or the bearing can get stuck, whether it can be lost due to serious wear and tear, the output shaft can be broken, look at the status of repair or change.
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