What motor is on your Mohawk A7 ?

[khnitz]

I picked up a Mohawk A7 to install in my shop/hobby garage, but it came with a 3-phase motor - and my shop doesn't have a 3-phase power feed.

One option would be to use a Phase Converter, but after looking at the costs for that, I think I could swap the motor with a single-phase unit for about the same cost.

So, my question is: to those of you with Mohawk A-7 lifts, if it has a single-phase motor, what is the brand, model, details?

From what I've found, I will need a "56" frame motor with the "H" base and "C" face mounting options.

The 3-phase motor on my lift is a Dayton 3N447A, and this is a 56HC motor. Here's an image of the details of the motor:

Based on my research so far, I think I could use a Dayton 5UKG4 motor, and swap the "C" face plate over from my 3-phase motor to allow the connection to the hydraulic pump.

Just looking for BTDT 3-phase to 1-phase conversion experience, or input on what other single-phase motors Mohawk put on these A7 lifts.

Thanks!

 

[Wrench97]

Did you try contacting Mohawk to what they recommend for a motor?

 

[khnitz]

The Mohawk PN is 601-180-040 at $724 per their website, and indicates a 2.5hp single phase motor for the A7. It's a service part, and their pricing is their pricing - but I'm looking to find a less expensive solution, if possible and if it would be a suitable substitute.

So, I'm reaching out to see what is on others lifts, with the actual brand name of the motor and its relevant specs.

@Wrench97, per your suggestion, I did also reach out to Mohawk and have left a message.

 

[finn]

Lift motors are “special” proprietary motors, with special shafts splined to fit the pump couplings. At least that’s what I found when looking around for a replacement motor for my 10k Bendpack.

Furthermore, the complete powerpack, with a new pump, valve, and reservoir is pretty close in price to just the motor, if there is even one available.

Do a search for hydraulic power pack, and you’ll find dozens available. They seem to be pretty universal as far as mounting goes.

I called several suppliers in search of a motor for mine. One did have motors for Mohawk, but he told me they only replace motors when a large customer has thirty to fifty lifts that are due for refurbishing. Otherwise, it’s more economical all in all to replace the entire powerpack.

I ended up spending a little more for an SPX powerpack than what the generic Chinese imports were going for.

SPX is a US name in the auto supply business, at least it was. Think Sealed Power before that name was sold off.

My powerpack was manufactured in Mexico. Don’t remember who I got it from, but it was one of the larger internet lift suppliers. Northern tool had the same powerpack at the same price, but wanted $50 for shipping. Mine shipped out of a Texas warehouse the same day I ordered it.

The SPX powerpack was about the same price, or maybe a little cheaper than the generic Chinese powerpack Bendpack uses on their newer lifts. The one that burned up the windings after using it fewer than fifty times over a two year period.

 

[khnitz]

Thanks for the feedback, @finn.

Here's what I've found so far: the shaft on this motor is 5/8" diameter, keyed, with a 1-7/8" length. The coupling and coupling spider (yellow) in the picture slip over the shaft, with the coupling held in place with an allen-keyed set screw.

So far, all this aligns with the specs on the Dayton 5UKG4 (though this lacks the "C" face, but I think I can move that over from the 3-phase Dayton pump from the lift) and some other motors out there (the Leeson 114995 seems like another option, and it would already have the "C" face on it, as well).

For someone searching this thread later, the "H" refers to the mounting plate attached to the case of the motor, and this is how the motor is attached to the lift column. The "C" refers to the mounting option that is part of the face of the motor (around the output shaft) that allows the lift's hydraulic pump to bolt up to the motor, which uses four 3/8"-16 bolts for this application.

 

[mikegt4]

Look around at Surplus Center, I found replacement parts for my lift power unit there.

https://www.surpluscenter.com/Hydraulics/Hydraulic-Power-Units/
https://www.surpluscenter.com/Electric-Motors/AC-Single-Phase-Motors/

 

[khnitz]

Thanks for the tip!

 

[finn]

I doubt that the Dayton motor was the original supplied by Mohawk.

Looks like a universal replacement with an adapter.

That may not be a bad thing.

The hydraulic pump power packs I was finding had a splined motor shaft, eliminating the adapter and set screw.

I think, but don’t know for sure, that the newer lifts all have the splined motor shaft.

 

[khnitz]

@finn, the coupling and coupling spider are called out in the Mohawk parts list online, so at least that portion algins with it being stock parts. Mohawk doesn't call out a 3-ph motor part for the A7 online, but either it was a factory option or it was part of the changes/upgrades made to this unit as part of the installation into a GM Powertrain facility.

Some of the other changes were to add 2-stage (2-handed) operation to the lift for safety. There is a lockout on the hydraulic line that has to be pulled with one hand, and then the lift motor (for raising) or release (for lowering) is operated with the other hand.

 

[finn]

Dayton is a private brand owned by Grainger, so it’s doubtful the motor on your Mohawk lift is original.

Mohawk would have sourced their motors directly from the manufacturer, not a will-fit retailer like Grainger.

Good luck!

 

[khnitz]

Thanks, @finn.

Hopefully someone will see this thread and post some pictures with the details of their OEM Mohawk A-7 motors so that I can compare.

In the meantime, I'm moving forward to see if a Dayton 5UKG4 will work.

I noticed that, too, from my searches - that Dayton was brought in-house to Grainger at some point.

Mohawk got back to me and suggested replacing the whole power unit for $1166. Again, that's their service part and their pricing - it is what it is. I hope to find a more "frugal", but still suitable, solution.

 

[Wrench97]

You might try a local hydraulic shop, several around here carry different power packs, or the Grainger online catalogue may get you closer with the specs.
I you still have any local motor rebuilders in the area that also would be a great place to pick their brains for a replacement number.

 

[finn]

Thanks, @finn.

Hopefully someone will see this thread and post some pictures with the details of their OEM Mohawk A-7 motors so that I can compare.

In the meantime, I'm moving forward to see if a Dayton 5UKG4 will work.

I noticed that, too, from my searches - that Dayton was brought in-house to Grainger at some point.

Mohawk got back to me and suggested replacing the whole power unit for $1166. Again, that's their service part and their pricing - it is what it is. I hope to find a more "frugal", but still suitable, solution.

I encourage you to look at the complete SPX power pack. Mine cost well under half that.

I also called s place in Northern Illinois, maybe near Sterling...can’t remember.

They were helpful, but more expensive for the same product. They have an online catalog for power packs. I think that’s the place that recommend replacement of the entire power pack as the best financial solution.

Again, mine was a direct bolt up, albeit mine wasn’t a Mohawk.

 

[khnitz]

I picked up the Dayton 5UKG4 to try, but the motor case sizes and front carrier bearing locations are just different enough that it won't be a suitable option.

So, I think I will keep the original 3-phase motor and add a Digital Phase Shifter to convert my single-phase power feed, like this one:
https://www.amazon.com/dp/B07F243HLG/?tag=atomicindus08-20

Probably won't get much more done on this until after Thanksgiving, but I'll continue to post here as I get this Mohawk ready and installed.

 

[Lsr]

I think I can help here. I just purchased an A-7 that was recently converted from three phase. Here is a picture of the nameplate. Also, note that the pump should rotate clockwise as viewed from the top. Ask me how I know.

 

[Lsr]

Maybe this picture is better.

 

[khnitz]

I think I can help here. I just purchased an A-7 that was recently converted from three phase. Here is a picture of the nameplate. Also, note that the pump should rotate clockwise as viewed from the top. Ask me how I know.

Thanks for that picture with the motor details! That Worldwide NT2-36-56CB looks like a reasonably-priced option, too.

Now I just have to debate whether I continue with a phase shifter or switch to that Worldwide single-phase motor. All the lockout and controls wiring on my lift are wired from the 3-phase feed, but there isn't too much needed to re-wire it all if I wanted to move over to the single-phase motor. I have to take everything out of the control box to clean up after a mouse nest, anyway

 

[khnitz]

Just to update on this, I am moving forward with the original 3-phase motor and am rewiring the control panel to accommodate a Digital Phase Shifter to take my 2-pole, single-phase 220V feed to the 3-phase, 3-pole supply that the motor will need. I'm still int he process of completing my lift installation, but I'll report once I get it up and running.