Question about Campbell Hausfeld Maxus 45 Lb Pressure Feed Sandblaster with Steel Hopper MXS21001

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No Sand or Air is coming out when trigger is pulled

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The sandblaster relies on a clear and unkinked line from the sand tank to '**** up' the sand and drive it out the nozzle with the air flow.

-Do you have air pressure at the nozzle? It may be obvious, but you need good air pressure. Pulling the trigger, you should get air out of the nozzle. If you don't, start with the air compressor.

-The sand needs to be dry and unclogged. Dump all the sand out of the container, and pour it back in through the filter screen.

Posted on Aug 13, 2009

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Posted on Jan 02, 2017

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Dewalt D51238 not firing when trigger pulled but air does come out?


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Gun will not fire if air is leaking past orings in head /headvalve or safety /trigger is not pushing trigger pin all the way into trigger valve. Test: Remove trigger to expose trigger valve pin. Remove nails. Place nose of gun against thick rubber mat or coiled rubber hose to absorb blow of driver. Very quickly and deliberately press trigger pin all the way in. If gun fires, safety foo or trigger is not pushing trigger pin all the way in. Make adjustments or replace worn parts. If gun still does not fire, remove head and pull out headvalve. Apply lots of silicone paste lube on the orings and the surface of the head where orings make contact. Reinstall head and test as above. If the gun fires then orings were leaking. Replace orings and sand any scratches on body of cap with very fine sand paper. Parts are at www.toolpartsdirect.com Good luck

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When headvalve orings are leaking, the nailer will not fire. Remove head and also remove the headvalve. Examine the surface/s where orings make contact looking for scratches. Sand surface with 300 grit paper until smooth. Reinstall parts using silicone paste lube. If head is too scratched /worn, also replace with new including orings as needed. Good luck

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Here is a link to hitachi web site listing for your gun. Look at the bottom of the page for pdf files of parts lists and manual.
http://www.hitachipowertools.com/store_item.php?iID=154&arrPath=1,9,43,p154,

There are two areas around trigger that can leak air. Spray soapy water on trigger stem and/or plunger valve. If leak is at trigger stem check vinyl ball. If leak is at plunger valve, most likely worn or broken oring inside of gun. Remove head and pull outer ring to reveal two orings. A worn outer oring will cause leak at plunger. If orings are ok on outer ring, pull cylinder and check for scratches where orings contact. If scratched, sand with 400 grit paper untill smooth and repack gun with oring kit. Good luck.

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Bostich rn46 . gun will work fine for awhile, then when i pull the trigger, all i get is air coming out of the trigger. i've put a rebuild kit in and i've also put a new trigger assembly in it. didn't...


Assuming that there are no leaks, remove head and pull headvalve. Look for fine scratches where oring contacts head. If there is a deep groove worn into head or scratched, sand with 400 grit paper to restore smooth surface. If badly worn replace head. Reinstall parts using silicone paste (looks like vaseline, sold at lowes in the plumbing department, used for faucet orings) )

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Have you tried pulling the spray nozzle tip off and checking it for blockage? The spray tips have a tiny hole for the water to pass through, and sometimes a grain of sand or debris will get stuck inside the nozzle and restrict the water flow. Something to check.

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Trigger Valve needs replacing. Part Number is FA205BA1. The valve comes with instructions, its a pretty easy fix. Any BBostitch dealer should be able to get you one.

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