Last summer I received a call from a neighbor who asked if I wanted him to deliver a new non-working 5000 lb capacity scissor lift table free of charge. If I could fix it, it would stay. Its back story: The neighbor had ordered it to use as a garage entry step with a possible future use as a wheel chair lift. When it was delivered, the lift rose up but would not go down for any reason. Trouble shooting with the vendor made no progress and they said they would ship another out to him…..no need to return the defective lift table. He needed it out of the way, so he brought it to me.
While waiting for his new lift to arrive, I worked on the defective one. There was apparently no paperwork or manual delivered with it, or it had been lost or destroyed. After figuring out the controls and making a schematic for it, it didn’t take too long to find one of the issues.
There was a very slight bend in one of the perimeter safety bars that would prevent any operation of the controls. You wouldn’t have noticed it unless you were looking up at it from directly underneath. But it was just enough of a bend to prevent a safety switch from resetting every few times. Once that was found and those safety switches removed from the controls, the lift now operates 95% of the time. There still appears to be a connection problem with either a wire in the hand controller/cable or a cold solder joint in the circuit board in the “UP” function when selecting that with the hand controller. Here’s pics:
I’m waiting for a solid failure again so I can trouble shoot the actual cause and find the faulty item. By now I know the control circuit quite well.
Now the story takes another twist: The neighbor gets his replacement lift table and gives me a call in desperation. That new table again didn’t work at all. With a meter and a few jumpers, we quickly tracked the issue to the hand controller, as bypassing it had the lift table and all the limit switches functioning as normal. There was a loose connection in the hand controller’s wiring. Along with finding the emergency stop switch was not functioning correctly and preventing control voltage to the circuitry. Both easy fixes. He was very happy with the now functioning table.
He still insisted on me keeping the first table even though it too was now functioning for the most part. I knew he had a sweet tooth like me and loved ice cream. So, I surprised him by delivering him one of my restored Hamilton Beach commercial malt mixers with the proper cups, malt powder, etc.
But now, what do I do with this lift table??? Too keep dust and debris out of the controls and underneath, I made a magnetic skirt to wrap around the table at the propped up stationary height I chose. I also put some heavy duty caster wheels under it to enable rolling it out when needed.
I’m starting to think about replacing the top with making a hydraulic lift welding table/fixturing hole setup with the clamps and accessories. The table top is 4’ x 6’ which would make for quite a large welding table in my shop. Or I could just redo the existing metal top into a fixturing welding table. I’ll have to see how easy it would be to add some bracing underneath to keep things flat.
The 5000 lb. capacity should be overkill for anything I’d put on it to work on or weld up!!
Open for suggestions…..other than shipping it off to other locations, that is.