' I Can't Get Parts So Can I Change Pumps?

by Paul S
(Northwest Illinois)

919.16600 parts diagram

919.16600 parts diagram

I have a Craftsman Model 919.16600 6.5 Hp 60 Gallon Twin Cylinder Oil Free Compressor.

Apparently, the ACG-6 Inner Counter Balance failed, taking the cooling fan with it. This counterbalance is No Longer Available. I've been looking all over, and nobody has one. Nobody.

So now I'm trying to figure out if I can salvage the motor and the tank by installing a totally different pump. It seems that the shaft on the motor would be a standard size that would work with a different pump. Maybe I'd have to reorient the motor and do some welding on the frame...

Is this feasible? I'm having trouble coming up with the correct search terms. When I search for compressor pumps I get stuff that looks totally different than my current pump, (mostly belt driven). I'm not sure what I should be looking for.

Anyone have any experience with this? I have a second compressor to use in the meantime. I'm not interested in buying a new compressor at the moment, I'd rather fix this one as a side project.

Comments for ' I Can't Get Parts So Can I Change Pumps?

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Dec 05, 2018
Re: Reassembly - it's fixed!
by: Anonymous

Found the problem. Counterbalance was slightly cocked and was hitting. Pressed it back on straight it’s all good now.

Dec 05, 2018
919.165600 Reassembly
by: John

Len I cant torque the nut down without the new counterbalance hitting the motor. Did I forget something?

Oct 24, 2018
Agreed ... a good fix!
by: Paul S

Right, Len's post is a good fix. Thanks, Len, I should have said so a while ago, but I've been busy.

Oct 23, 2018
Craftsman 919.165600 parts
by: John

Len thanks so much for this post. I ordered one today. You saved me from buying a new compressor. Putting in new connecting rods while I have it apart.

Sep 12, 2018
ACG6 compressor part
by: Len

To any one looking for part ACG6 for compressor AC-101 the part is available from https://wiremeisterdesign.com/ for $100.00 plus 15.00 shipping.

I tore my compressor down 2 years ago to put new pistons and cylinders in it and the ACG-6 part broke when I was torquing it down.

This guy at Wiremeister design machines these and I found him on the inter when looking for the part. I put every thing back together yesterday and all is well!!

The instructions that came with my pistons said to torque the nut to 100 ft.lbs. I only got to 60ft. lbs when it broke last time so this time I tightened it good and tight and used blue locktite on it. I think it may be good for another 20 years, at least I hope so.

Oct 10, 2017
Moved On
by: Paul S

No chance I could fab one, it's a finely cast piece. I've never cast Iron and I'm certain that piece would be a difficult one for a beginner.

It failed during normal operation. It was scary as hell. It made a loud rattling sound. I was afraid as I approached it. I thought something might breach the housing and hit me.

I'm going to convert the old tank into something else.

Oct 10, 2017
model 919.165600 having same problem
by: joe

i have had the same pump problem and after rebuilding it the second time with pistons/sleeves,washers.

The piston cracked in half taking out the fan.

I than began looking for a new pump WITH no luck anywhere. I am going to also fabricate my own new mounting platform.

Prior post I have read became alarming when talking about mounting your own platform to the tank itself.

You maybe very well be weakening the structure of the tank.

You may want to create your own platform and rubber mount it to the existing one. Good luck

Dec 30, 2016
by: Paul S

Hold your breath and take cover!

I considered that, please let me know how it goes. I looked up some videos on welding cast metal. It looked a bit beyond my skill. I think you have to be careful how fast it heats up, or cools down, (or something of that nature) or you end up with something more brittle, or something like that... I forget, but I remember at least that the video I watched put me off the idea.

Dec 29, 2016
by: Len

Thanks for replying, at least I'm not the only one in pain with this compressor. My son is going to try and weld it so I am holding my breath.....

Dec 28, 2016
Current Status
by: Paul S

No, I never did. I found a different compressor in my Dad's basement with some broken air lines and ended up repairing that. I still have the hulking thing in my barn where I built it into the structure. Sorry to hear you got stuck with the parts. There has to be one floating around somewhere. I'm not looking anymore, so at least that's one less buyer on the market for that one. Good luck.

Dec 22, 2016
by: Len

Did you find a replacement part or are you still looking? I have the same problem only I bought both replacement piston and cylinder kits, now I have $130 in parts that I cant use just because of this obsolete part breaking.

Apr 15, 2016
by: Doug in s.d.ca

...that you're not in a hurry.

Good luck.

Apr 14, 2016
Counterbalance Failed During Normal Operation
by: Paul S

The counterbalance failed during normal operation. It was loudly doing its thing and suddenly it was even louder with a lower pitched buzzing. It sounded so angry I turned it off at the breaker rather than approach it. At first, I had hoped a fan blade had come off or something nice like that, but when I got the cover off I found the counterbalance in two pieces; it failed at the place where the casting was thin. It took off about half the fan's blades and slightly gouged some of the aluminum parts.

I think the chances of successfully fabricating a replacement would be near zero. It is a fairly high grade casting and while I've always wanted a forge, I'm pretty sure this one would be extremely difficult since balance and weight are going to be very important.

You probably have the right idea; since I'm not in a hurry, I should just look for a similar model to cross my path.

Thanks for correcting my model #.

Apr 13, 2016
pump on 919.166600
by: Doug in s.d.ca

It's a 919.166600, BTW.


Looks like a common failure. Any chance you can fab one?

How did it fail, anyway?

FWIW, I've never seen a whole direct drive pump sans motor. Maybe make yourself a list of units that use this part and search for used, with a broken something else.

Good luck.

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