1. The mast is not synchronized when it is tilted. The cause of the failure may be the inconsistent stroke of the two inclined cylinders or the inconsistent size of the shut-off holes at the cylinder pipe joints. You can adjust the stroke of the two tilt cylinders or replace the cylinder with the same shutoff hole. Connector.
2. The mast cannot be raised when there is no load because the overflow hole of the multi-way valve is blocked. It is enough to remove the debris in the overflow hole of the multi-way valve.
3. The fork mast descends too fast, because the oil inlet speed limit valve does not work, only the speed limit valve needs to be repaired.

4. The automatic lowering of the fork mast is caused by insufficient hydraulic oil in the cylinder. The method is to repair the multi-way valve and add hydraulic oil.