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Senior Member
Welcome Kbitt.
The holding valve for the boom lift cylinder is a rectangular aluminium block bolted to the hydraulic piping on front of the boom lift cylinder. They do go bad sometimes. JLG part number 4640265
The other possibility is a leaking manual decent valve. Make sure all 3 valves are tightly shut.
The holding valve for the boom lift cylinder is a rectangular aluminium block bolted to the hydraulic piping on front of the boom lift cylinder. They do go bad sometimes. JLG part number 4640265
The other possibility is a leaking manual decent valve. Make sure all 3 valves are tightly shut.