Air Impact Wrench

Sometimes when i pressed the trigger on the air impact wrench it would just let air out and do nothing else and when it did work it would undo anything above 40ft lbs i took it apart to see if i could see what was wrong but now it doesnt work at all just lets the air out when i press the trigger all the time
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Two key points: what type/size of impact wrench is it and what is your inlet pressure. Most cheap and even good quality impact wrenches are designed to run at pressures above 75psi (some even at 90+ psi particularly for larger 1/2" models). If your inlet pressure is low you will get no power and excessively low pressure will cause the problem you mentioned, no rotation just the air flow. If low inlet pressure is ok then it very well could be the tool. Do you lubricate it frequently or at all with a air tool lubricant.
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Did you lube it like the directions say when you last put it away? Is the line pressure high enough?
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Also, your air source may have a restriciton in your hose or feed line.
Even though you have a 100psi showing on your guage, a restriction can bleed down the effective pressure to 30psi as measured at the drill turbine.
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Thanks for the replys
I've managed to get it working again but just back to it was before i took it apart so it still wont undo anything above 40ft lbs still.
Its all oiled, the compressor is only a small one its a cosmo 1.25HP 6 litre, piston displacement 7.5 CFM and max air pressure 118psi and the impact wrench is a 1/2" drive, air consumption 4 CFM, pressure required 90psi, air inlet 1/4"npt.
The air line is the one from this kit http://cgi.ebay.co.uk/5-PCS-AIR-TOOLS-KIT_W0QQitemZ7992017150QQcategoryZ30906QQrdZ1QQcmdZViewItem would it make any difference if say i buy this air line http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&itemC96462538&rd=1&sspagename=STRK%3AMEWA%3AIT&rd=1#ebayphotohosting or cant the compressor cope with an impact wrench, the pressure is right up on full
Cheers

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