Dirt in the load holding valve: Worn seals in the mast cylinders. The mast cylinder is deformed due to excess pressure:
Clean the load holding valves on the mast cylinders. Set the installation pressures according to the technical data sheet. If necessary, replace valves. To do this, contact the company's service department to replace the seals. To do this, contact the company's service department to replace the mast cylinder. Why contact the company's customer service