Thanks itsmoked. The problem with the lift actually was nothing hydraulic....it was just a bad ZETTER relay (automotive type, black cube, 30amp, one set of form C contacts). I bought the lift from Edmonton, approx a 3hr drive away from Calgary, but I have a 1-ton dually truck, so I got a local...
Ok, as promised here is the picture of the recently repaired lift raised to 26' (platform height) above grade. I repaired this in my home's driveway, so the o/h lines feeding my house are in the picture.
Again, thanks for your help! I TOTALLY benefited from your help!
I have another post...a...
Ok, I will do that.
Once it quits raining here in Calgary, AB, I'll take a pic or two. It started yesterday, and is supposed to keep going until Wed/Thur.
Too, I will check out the "threadminder" link you've suggested in this ENG-TIPS forum.
I don't know the codes in MN, but it seems that using a grounding bushing is going to falter the reason why the CNC manufacturer wants an isolated ground, that is, an independent ground separate to the buildings common ground through its structure. When placed, levelled and secured, its likely...
Ok, I finally got a pressure gauge. Checked the output at the proportional (prop) valve, nothing. Upon any command for hydraulic pressure, the prop valve routed the oil back to the tank. I checked for DC power at the prop valve, nothing! I thought I checked that before, but it appears I must...
Ok, Thanks Again LittleInch. I'll go get a pressure valve today, and the necessary fittings. I'll let you know.
Again, I take your suggestions very seriously....you are FAR more knowledgeable on this than myself as an electrician.
Best Regards
My replies are in RED:
Ok, I did perform the first suggestion of LittleInch's most previous comment:
LittleInch = "The pump should be producing flow (It does)and if controlled correctly (It is. Pump Inlet from reservoir, pump output to pressure compensated proportional valve, motor turning...
Thanks So Much 3DDave and LittleInch for your advice. I really do take it seriously, and I apply your suggestions each day (or the next day, time permitting) that you recommend. The two of you are far smarter than I am with this. Naturally, I do good with electrical, but my experience in...
The hydraulic pump is a positive displacement pump.....should it freely spin manually with only muscular force? The input and output oil line hoses are still connected, I haven't touched them. I don't feel it building pressure and producing resistance when rotating it by hand. Is this right?
@LittleInch
Good Day and Thanks for your reply. I am respondingRED:
Did you follow the checklist in the service manual? I already accomplished the suggested remedies in the service manual, no success
Are you holding in the enable button all the time while asking it to do anything? The...
BTW - The hydraulic pump is still attached to its respective hydraulic oil lines. I only removed the pump from the motors mounting bolts. Pump is still connect to it's oil lines and still in the lifts hydraulic compartment.
I removed the motor from SkyJack scissor lift, and then removed the hydraulic pump from the motor. The hydraulic pump spins freely by muscular force! Is that right?
Thanks to #DDave, TugBoatEng and LittleInch:
This might seem stupid, and maybe it is.....but, what if I slightly open the oil line discharge from the pump and see is hydro oil squirts/sprays everywhere when the pump motor is given a command?
I am only an electrician, but I've always been skeptical of nameplate xfmr's impedance (Z%) data. The core would have to be saturated (xfmr under FLA) to determine this. I'm not sure if xfmr manufacturers are doing this, or simply deriving it by simply reading winding resistance and adding...
@ btrueblood: I checked the red valve. It's spring loaded, to return to the "IN" position. I suspect it opens when pulled (and maintain pulled muscular force), it releases the oil as you commented on. I didn't see any electrical interlocks on this NC (normally closed) valve. Thanks for the...
Good Day LittleInch and 3DDave,
I have the manuals already. They show everything, that is, hydraulic system and the electrical as well. It is a SkyJack SJIII 4626 scissor lift. Problem is, I don't know what to look for in hydraulics. As a Master Electrician, I do have electrical testing...
