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Chicago Pneumatic 734 1/2 Impact Wrench

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Robert(AL)

03-23-2001 22:14:04




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Anyone had any experience with rebuilding this tool? Mine has quit working! Cleaned and oiled it, but it will not operate anymore.

Can this tool be sent back to CP for a rebuild, or would you suggest purchasing a new one?

Robert




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John Ne.

03-24-2001 08:36:38




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 Re: Chicago Pneumatic 734 1/2 Impact Wrench in reply to Robert(AL), 03-23-2001 22:14:04  
Robert, I've used and rebuilt many CP734 air wrenches, just remove the allen screws at the back, and everything slides out, If it doesn't it means the aluminum case has been pounded a lot, like an old gas station wrench, does the air motor run? if it does, does the anvil turn like an air drill, and won't hammer? As rebuilding goes,if it comes apart, this thing is a piece of cake. Most usually found a tiny inch long hammer broken inside the impact assembly. A schematic and some parts should be available from tool men. I'd be searching CP on the net for info too. The H model evidently has a different style of hammer assembly which is more powerful. I've never found a impact to run too well at less than 100 psi, they eat a lot of air. So ask yourself if your air compressor is up to it. John

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Robert(AL)

03-24-2001 14:25:12




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 Re: Re: Chicago Pneumatic 734 1/2 Impact Wrench in reply to John Ne., 03-24-2001 08:36:38  
John,

It isn't my compressor. I have a IR that will operate a five bay garage. Thanks for the advise!
Think I will tear it down and see if I can fix it.
Just bid on a IR 2131 on eBay. Maybe I will have a backup.

Robert



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ltf in nc

03-26-2001 07:56:54




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 Re: Re: Re: Chicago Pneumatic 734 1/2 Impact Wrench in reply to Robert(AL), 03-24-2001 14:25:12  
As stated previously, most air tools are designed for 90 psi shop air. If the tool does not perform at that pressure the supply volume is inadequate or the tool is too small for the task. Why people want to abuse their air tools by using excessive pressure is beyond me. Would these people take a tractor that the maximum engine rpm is 2400 and operate it at 3600 rpm and expect it to survive. I think not!

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tools

03-24-2001 13:44:01




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 Re: Re: Chicago Pneumatic 734 1/2 Impact Wrench in reply to John Ne., 03-24-2001 08:36:38  
Hey John,

The pressure thing definitely seems to be the trick. However, the manual CLEARLY states not to use more than 90psi. Have you found using more pressure significantly decreases the life of the tool? This is my concern. If it does, I'm going to get one with a no hassle warranty, and cram whatever pressure is needed down its throat (I'll very soon have my NEW, well restored, air compressor together). In reality I guess this is a mute question because I'm going to find out! Have you found a compromise pressure that gets it off its butt, but doesn't kill it too quickly?

Even the best laid plans....

Tools

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Dave

08-18-2003 20:36:49




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 Re: Re: Re: Chicago Pneumatic 734 1/2 Impact Wrenc in reply to tools, 03-24-2001 13:44:01  
Does anyone know of a site that has a parts breakdown of a 734 and a list for same??



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John Ne.

03-25-2001 09:41:49




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 Re: Re: Re: Chicago Pneumatic 734 1/2 Impact Wrench in reply to tools, 03-24-2001 13:44:01  
hey Tools, The shops I've worked in have usually had from 120-145psi, I can turn down the pressure with the regulator at my station, but below 95 psi, the half inch turns into a real dog. The high power new ones the kid along side me has, works pretty well at 90 though. I like to run reduced pressure, 90 or sometimes lower using the air ratchets for reassembly, there is so much aluminum in todays vehicles its nice to go slow and snug things down. Even at 145psi, in daily use, have found a good quality impact to go 3-5 years, before needing a kit. This is with tire work, engine work, etc. It spends more time in use than laying in the box. Also use a 3/8 id airline. Have found not enough volume in long runs of 1/4. John

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tools

03-24-2001 07:14:41




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 Re: Chicago Pneumatic 734 1/2 Impact Wrench in reply to Robert(AL), 03-23-2001 22:14:04  
Hi Robert,

I just bought a 734H (don't know how the H makes i different if at all). Apparantly mine was defective and I got it replaced. In the transaction I did find out you certainly can send it back for repairs, but I'd get an estimate first. I found 734H's on some website for $76 new. Mine cost $106 locally. Frankly the jury is still out for me on whether I like this tool or not. My little 1 HP air compressor certainly doesn't make it a worthwhile tool, although the consensus is that it's a GREAT impact wrench. Personally, I think the people who like this thing so much (about half of this opinion is verified) are running the wrench at pressures well above what it's supposed to have.

Good discussion on impact wrenches just a few days ago. The IR 2131 looks good (which Sears sells with a no hassle warranty) and the Husky also has a no hassle warranty. I'm coming to the conclusion that these things are just to violent internally to be considered long lasting and therefore the warranty is the most important feature.

You know, I'd consider giving them (CP) a call and giving them heck and reminding them how you're hearing on the internet that their tools kinda stink, and their dealers aren't much help (VERY TRUE in my case, man I went round and round with them). Either they fix it for free or you're going to Sears or Home Depot. Got nothing to lose, I'm sure they have a 800 number.

Good luck!

Tools

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bill hillbrant

03-24-2001 17:40:02




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 Re: Re: Chicago Pneumatic 734 1/2 Impact Wrench in reply to tools, 03-24-2001 07:14:41  
got a 744 cp you'se to work in generating power houses. most had 250 lb air used th cp all time on it. thought many times it should break the anvil off never did. wrench is about 10 years old now, still using it - still will twist off a grade 5 5/8 bolt if you stay hammering on it. best tool for the buck as far as i am concerned. about 225$ boy when i get started i don't know when to quit. bill

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Mark Webster

08-24-2001 01:55:49




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 Re: Re: Re: Chicago Pneumatic 734 1/2 Impact Wrench in reply to bill hillbrant, 03-24-2001 17:40:02  
The brief manual says Check clutch oil once each month. Use 3/4 oz. (22 ml) of SAE #30 oil or equivalent.

Please tell me how to check the clutch oil I have a CP-734 about 8 years old.

Thanks mark



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