Assuming the problem is indeed the pump, on the NAA/Jube the hydraulic pump is on the side of the engine and is driven from the flywheel. If it's the older Vane style it will be nearly impossible to replace/fix/rebuild. If it's the piston-style you can get rebuild kits. You can replace a Vane pump with the more common Piston pump but to do so you will need replacement hydraulic lines which are very hard to find.
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