LoneStarGulfCoast
Member
I started a post a while back on a 1991-1992 Ford f800 with JLG 1418 crane I acquired in real estate purchase. I have a buyer who's been working on the truck and we got the truck running this past weekend. With 30,000 miles, engine sounds fantastic, no major issues.
We fired off the PTO hoping to lift the Drivers side A-frame outrigger that leaked and is set in the down position. The crane boom worked, good hydro pressure. NONE of the outrigger arms (2) or rear stabilizer arms (2) will engage. When holding toggle switch and engaging the controls, you can hear the hydro whine. We loosened the cylinder arm fittings to see if oil flowing and it is just a weak flow. The thought is it is some type of electrical issue or switch not allowing the cylinders to move. I am a crane novice, but mechanically inclined.
I need some ideas on what to check.
-I doubt it's a clogged filter (crane boom hydraulics work).
-Engine RPM was set a little higher than idle, not very high RPM. I would suspect RPM is not the issue because the passenger side Arm would not move down or up either, it would move very slow down if it had some hydro power.
- Arm is not torqued, we were able to jack it up off the ground and it moves freely. Truck is sitting with a little tilt, not much though
- Any ideas where to chase down electrical schematic or are we missing something major that would lock us out of the outrigger/stabilizer arms?
We fired off the PTO hoping to lift the Drivers side A-frame outrigger that leaked and is set in the down position. The crane boom worked, good hydro pressure. NONE of the outrigger arms (2) or rear stabilizer arms (2) will engage. When holding toggle switch and engaging the controls, you can hear the hydro whine. We loosened the cylinder arm fittings to see if oil flowing and it is just a weak flow. The thought is it is some type of electrical issue or switch not allowing the cylinders to move. I am a crane novice, but mechanically inclined.
I need some ideas on what to check.
-I doubt it's a clogged filter (crane boom hydraulics work).
-Engine RPM was set a little higher than idle, not very high RPM. I would suspect RPM is not the issue because the passenger side Arm would not move down or up either, it would move very slow down if it had some hydro power.
- Arm is not torqued, we were able to jack it up off the ground and it moves freely. Truck is sitting with a little tilt, not much though
- Any ideas where to chase down electrical schematic or are we missing something major that would lock us out of the outrigger/stabilizer arms?
