Bastard Scissor Lift

[Stroppymonkey]

If nothing else you've done the hire industry a favour

I don’t like being beaten and not understanding things. Although it happens regularly.

 

[V8Druid]

Had a poke at it this morning . Last time I used it, it was fine, then parked up for a bit. I put the new valves in and blew the seals straightaway. At the time I thought I noticed the back wheels dragging a bit. Needed to try it with wheels up in air. It’s too clever and won’t run wheels when legs down, so fooled it by jacking up, propping axles then retracting legs.

Messed about. Sprung operated brakes are always ON unless hydraulically released. Only on back wheels though.
Put new seals on the valves and refitted.
After @V8Druid suggestion I ordered up some LED DIN plugs for the solenoids.
some wiring butchery was required as plugs only allow single wires and was all 2 wired on each terminal.
Bought 2 new solenoid’s for Forward and Reverse drive as not dear and I am grasping at straws. The Brake OFF solenoid has very loose connections so I fitted a plug on there as well. I was suspicious of the brakes, so pulled solonoids off the drive then tried forward and reverse. NO LED on the Brake Solenoid which I think should be powered up when Forward or Reverse drive activate.
I have manually pumped up the brakes for now (only using on the flat ) and got on the ground and very happy to have drive!
Had a good afternoon’s work out of it until I ran it out of derv. Flipping idiot.

One leg wasn’t going down on Auto Level, only manual, but it seemed to fix itself.

Will get it jacked back up and will have another play. Need to get a test DIN coil plug made up on a switchable 12v supply to test the brake coil, and assuming it works as I expect then I need to chase the wiring back To find out why it’s not getting a signal. The live runs to a pair of relays that have been taped up, and look bodged in, next to an original relay that’s been bypassed, so someones had a fiddle with this historically.

you do know the third (centre) pin on those solenoids is only an earth ?? two side pins are pos/neg ... live/neutral, on a.c. coils

 

[Stroppymonkey]

you do know the third (centre) pin on those solenoids is only an earth ?? two side pins are pos/neg ... live/neutral, on a.c. coils

Yes.. only the side terminals wired, but the neg is looped across many coils, and the live goes off somewhere from each one as well. Previous poking has clearly been done at some point between now and 2008. If I wanted to tidy it up I could fit 2 core flex to every coil and pull all wired back to a central glanded box. Brakes need to work, so will be getting wiring guide out having a poke soon. Top tip about the LED plugs though. Game changer. I wish we had them in oil boilers!