Question about my Mac Aw612 impact gun

[hondacivic247]

whwas rotating the tires on my car and finally used my used mac aw612 impact I got off ebay and I couldn't break 3 lug nuts loose with it had to use my electric kobalt which is rated at 350 ft lbs. I got a quincy 325 and had my regulator set to 95psi. It would hammer it then not move at all my kobalt hammered it loose in a few impacts. This mac is suppose to make way more then 350 lbs of reverse torque. It sent them on no problem then I torqued them with my torque wrench. I just don't understand why it's so weak on power?
I got a 1/4 fitting on my line and gun, should I have a 3/8 fitting to get more power out of it?

If I can get it figured out its going for sale and I'm getting a ingersoll rand.

 

[Sticks McGee]

Any way to turn the regulator up? I personally like to run 120 and up on an impact. have you used other impacts prior to this without issue? Has the gun been oiled with air tool oil?

What hose are you using?

 

[stikman56]

Most likely either a problem with your air delivery,or a problem with the hammer pins/ and or cam in the gun. Those are really strong guns when they are working right.

 

[MattPersman]

95 on regulator is way too little IMO either bypass regulator or max it out and see what happens.


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[Scimmia]

Yep, pressure too low. You need 90 PSI at the tool, not at the compressor.

 

[CobraChevelle]

i would try another air tool @ the same air settings. I had IR and Snap on with 95 @ the reg cause of lack of compressor size and did not have a prob with lugs

 

[stikman56]

Yep, pressure too low. You need 90 PSI at the tool, not at the compressor.

Yes, this. 90 at the gun with the trigger pulled. However an AW612Q should still have no problem with a properly tightened lug nut at all with 95 at the reg. if the air delivery is OK. Properly working that's one of the strongest 1/2" guns out there. There are only a handful of stronger guns out there, and they are recent arrivals to the party.

 

[Scimmia]

i would try another air tool @ the same air settings. I had IR and Snap on with 95 @ the reg cause of lack of compressor size and did not have a prob with lugs

And if you're running a short hose and high flow fittings, you may very well be fine with 95 at the regulator. With regular fittings and a 25' 3/8" hose, I'd expect a 15 to 20 PSI drop using a good 1/2" impact. This would leave 75-80 PSI at the tool, which will have a very noticeable effect on performance.

 

[hondacivic247]

I got a 25ft or 50 ft hose that says 3/8 but has 1/4 fittings. My compressor is 80 gallon I run it up to 150psi. I got a old heavy duty regulator which I ca adjust up to 300 psi that's fed by a 3/8 line then it drops to 1/4 to my hose. I got super dry air with my 500 dollar dryer setup and always keep my tools oiled. I'll have to up the psi at the regulator cause I didn't take into account the pressure drop

 

[RV77]

The allen screws that hold the nose on are tight correct ? Ive had mine loosen up and didn't notice at first.

 

[hondacivic247]

I'll have to check but I assume there tight. I may just tear the gun apart and take a look inside if adjusting the pressure doesn't solve my issue. Hopefully it's as simple as just adjusting the regulator.

 

[hondacivic247]

The hose is a amflo with a 3/8 ID 300psi max

 

[stikman56]

I'll have to check but I assume there tight. I may just tear the gun apart and take a look inside if adjusting the pressure doesn't solve my issue. Hopefully it's as simple as just adjusting the regulator.

If you do take it apart...Post a good clear close picture of the motor end plate ,the cam, the ball the cam rides up on, the hammer pins and ears on the anvil where the pins contact it, if you can.

 

[hondacivic247]

So i took the gun apart and wasn't paying attention to how it came apart now I can't figure it out. Anyone know how to put it back together or have a schematic sheet

 

[hondacivic247]

Never mind I got it all figured out I only took apart the front of the gun and everything looked new had plenty of oil couldn't figure out how to get to the motor in it tho

 

[hondacivic247]

The gun looks almost new and I doubled checked the bolts and air fittings for leaks and it's solid

 

[hondacivic247]

I'm gonna torque down a lug nut tight tmrw and see if it will break it lose it seemed to run stronger when I held it by hand and let it impact

 

[jd3290]

whwas rotating the tires on my car and finally used my used mac aw612 impact I got off ebay and I couldn't break 3 lug nuts loose with it had to use my electric kobalt which is rated at 350 ft lbs. I got a quincy 325 and had my regulator set to 95psi. It would hammer it then not move at all my kobalt hammered it loose in a few impacts. This mac is suppose to make way more then 350 lbs of reverse torque. It sent them on no problem then I torqued them with my torque wrench. I just don't understand why it's so weak on power?
I got a 1/4 fitting on my line and gun, should I have a 3/8 fitting to get more power out of it?

If I can get it figured out its going for sale and I'm getting a ingersoll rand.

Should of got an IR231C

 

[Scimmia]

Should of got an IR231C

You're joking, right? While I like my 231 (older US made model), the Nitrocat 1200K/Mac AW612Q is far more tool.

 

[hondacivic247]

If it does end up getting sold I'm getting something with just as much torque, I really don't want to cause this mac is so quite and I live in a development that has noise restrictions, and another gun will cost more then the 100 bucks I spent on this which was a steal off ebay as it's in great shape

 

[CobraChevelle]

If it does end up getting sold I'm getting something with just as much torque, I really don't want to cause this mac is so quite and I live in a development that has noise restrictions, and another gun will cost more then the 100 bucks I spent on this which was a steal off ebay as it's in great shape

the aircat 1150 on amazon for 169$ is not a bad buy. and it has a built in muffler. this is also the twin hammer design not the twin clutch.

 

[hondacivic247]

What's the difference between a twin hammer and a twin clutch ? The mac is a twin clutch right?

I'm just using it for my own personal cars and restoring air compressors when I'm ingersoll rand 107xp ratchet can't brake stuff loose or my Milwaukee fuel impact driver which I love to use its actually broken lug nuts loose and broke a extension for using sockets it's got so much power for a impact driver

 

[stikman56]

What's the difference between a twin hammer and a twin clutch ? The mac is a twin clutch right?

I'm just using it for my own personal cars and restoring air compressors when I'm ingersoll rand 107xp ratchet can't brake stuff loose or my Milwaukee fuel impact driver which I love to use its actually broken lug nuts loose and broke a extension for using sockets it's got so much power for a impact driver

Can you post a pictures of the pins,the cam and the motor end plate. Those are likely when the power is low. Also, make sure the intake port isn't plugged with teflon tape, etc. Seen that many times.

 

[CobraChevelle]

What's the difference between a twin hammer and a twin clutch ? The mac is a twin clutch right?

I'm just using it for my own personal cars and restoring air compressors when I'm ingersoll rand 107xp ratchet can't brake stuff loose or my Milwaukee fuel impact driver which I love to use its actually broken lug nuts loose and broke a extension for using sockets it's got so much power for a impact driver

twin hammer uses a heavy blow. That is needed to use a torque stick. Clutch uses a smoother softer blow.

If you talk to air cat they will even tell you the twin hammer will last longer than the clutch. The new NitroCat 1250k looks to be an animal with the twin clutch.

I was going to get the 1150 but went with IR2235. Overkill for weekend warrior but thats how i am with tools sometimes. Twin hammer been around forever, only twin clutch is used by new aircats, but don't quote me on that. I am sure someone else knows more.

But for the OP, I had the old snap on xt7100 that was gutless from the box (bought on ebay years ago new) was using 30gal comp with just enough cfm. Was I at 90 psi at the gun? prob not, but when the old generation Harbor Freight earthquake was taking bolts off the snap on couldn't with the same air supply. I knew this wasn't right. Is this the correct way of testing? prob not. Couple years go by I sold the xt7100 went out and bought the MG725 and killed the last 2 with the same air supply.
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[hondacivic247]

I prolly won't be taking the gun back apart but everything inside it looked brand new there was no weird wear or even signs of wear on anything internal. I can almost guarantee that I just didn't have enough psi at the gun being at 95psi at the regulator and having a 50 ft hose it was prolly more like 70psi. I read that the twin clutch has way less vibration when in use it felt really smooth. I'm sure this gun will last me a good 10 years with the little use it will receive.

 

[stikman56]

Lots of guns use twin clutch ,actually. Even some 3/4" Ingersolls', the 252, 255 and 258 models. They work smooth and powerful. Twin hammers will break too, hammers and cages and even anvils where the hammers hit them. I've seen all that and more, even on Ingersoll Rands. Nothing wrong with the pin style hammers, they are nice to use, I prefer them myself.

 

[hondacivic247]

I got it all sorted out this week when I went to put on some new continental snow tires on the front of my corolla. The issue was line pressure drop at the gun. I adjusted my regulator up to 125psi and with a 50 ft hose it should be around 90psi at the gun. I was amazed at how fast it spun those lug nuts off. I put it on the lowest forward setting and tapped the trigger and it spun them on and I hit it with the torque wrench and they were about perfectly torqued .