I have a customer that shipped this truck in from another location and it arrived with a mast problem. The side cylinders (one per side) lift before the center primary cylinder. I suspect packing is blown out but not sure if the oil distribution block contains a flow valve that could be sticking. I'm sure the problem is within the hydraulics as removing lift chains and SS hoses made no difference. The truck was in a garage with 8 ft. ceiling and was unable take it outside to extend the mast due to heavy rain.
I've not had much experience working on Nissan's so thought I would check in here before tracking down a dealer in my area.
Thanks for any help.