I have a Cat branded JLG TH514 (TBW serial # prefix)telehandler with inoperative hydraulics and the boom stuck in the air. The JLG service manual recommends connecting an auxillary power source with a 9 gallon capacity to the main control valve to manually lower the boom. Unfortunately our shop doesn't have any auxillary hydraulic source tooling to accomplish this. Does anyone have any recommendations on what to use for the auxillary hydraulic source? I'm interested in what other shops have come up with for solutions. I realize using the hydraulics on another machine is an option but I would like to set-up a portable auxillary hydraulic power unit that can be taken out into the field where other machines might not be available. I would like to avoid having to separate the lift cylinder's lock valve from the hydraulic cylinder because supporting the boom with blocking or stands, while it is hoisted with the crane, can be tricky if boom is high enough.