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Old 02-23-2010, 08:49 PM
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Problem: keeping media flowing in HF pressurized blaster

I have a Harbor Freight 40 Lb. Pressurized Abrasive Blaster. The problem is that I can get the media flowing initially, but then the media stops even though the air continues at full pressure.

I open the mixing valve a little at a time until I get some media flowing, but then it stops (again).

Thinking that the media is clogging in the mixing valve, I added another valve where the airflow splits to the mixing valve on the bottom of the pot and to the pot so that I could drain the pressure from the pot (after disconnecting the air hose and opening up the entry valve), then blow air up into the pot by opening the mixing valve. This works, but after hooking up the air again and pressurizing the pot, I still only get a few seconds of media before it stops flowing again.

Any ideas?
TIA
Chaz

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Old 02-23-2010, 09:18 PM
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make sure you are not getting any water mixed in.. You should be able to open the valve in let it start to come out, then close it a little, and then it should go good.. every now and then you may have to do it again to clear it out.. Water in your air line can cause you some problem's..Hope this helps you..
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Old 02-23-2010, 11:11 PM
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elevate

sometimes it helps to elevate your media pot so the vacuum won't have so far to lift the media ..mabe high enough so it just travels down hill.
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Old 02-23-2010, 11:48 PM
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I have one, but only used it a little. The nozzle assembly that comes with it seems to be a real POS, that the smallest little stone or clump will clog the thing up, and often only get a few seconds of blasting and constantly tearing it apart to clear it out. I plan on replacing with a good deadman valve based on recommendations I've seen.
Moisture free air is a must when blasting.

Be careful. The water seperator on mine blew apart at the threads the first time I hooked it up. Could have been bad news if I was hit with the force it blew apart with. After doing some searching and reading on the net, seems like quite a few others have experienced the same thing. HF sandblaster popped under pressure I now hook up my water trap/regulator I use for painting when using it. Can see a lawsuit in the making with someone seriously injured or killed when the thing blows apart.
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Old 02-24-2010, 12:58 AM
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Are you using new media I know some guys sweep up and reuse old media if so are you straining before you put it back into the blaster I had this problem one time before and a guy I let use the blaster put some old media back in and he didnt strain it and there was a small rock that was the problem
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Old 02-24-2010, 06:04 AM
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All good answears Ive had all the same trouble with mine.plus... I was getting TO much media out so I tunned the valve down at the bottom of the tank it was working great until sand wore a hole through the brass valve. You gotta have dry air and clean media...all and all I've been pretty satisfied with mine.as with most HF tools you have to play around with them to get them working properly I had a lot of trouble with their blast cabinet,I replaced all the hose clamps and made a few modifications and it works fine...for the price I cant complain at all....
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Old 02-24-2010, 08:02 AM
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If the media seems to be bridging at the bottom of the tank, here is what some guys do. Strap a vibrating sander to the unit. If it is the hose of nozzle that is clogging up, that is a different matter.

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Old 02-24-2010, 08:19 AM
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DANG, Cboy, thats a GOOD one....
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Old 02-24-2010, 08:20 AM
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Also, as others have mentioned, these pressurized blasters have a tendency to wear our EVERYTHING in their path...that includes hoses, nozzles, shut offs, and the valve at the bottom of the tank. Here is a thread about how I wore right through the hose at the bottom of my tank and shot black beauty all over my shop. And that was after just two or three hours of total use.

I'm not sure how others overcome this problem (media wearing right through the machine's components) but after repairing the damage to my unit, I've been so wary of it happening again that I simply don't use the thing anymore.
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Old 02-24-2010, 08:36 AM
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Home Made Water Separator

Media was cloggin for me too. Solution was this water separator made from a $20, 5 gal air tank and a coil of 1/2" OD copper tubing and placed in a big plastic bucket and surrounded with ice. Air goes in the copper tube, into the tank on the side, and out the top. 1/4" pipe with a valve on the top connects to the bottom of the tank to drain water.

No clogging problems when using the dryed air and dry media.
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Old 02-24-2010, 09:45 AM
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I had similar problems with mine.

In taking it apart, I discovered that the nipple threaded into the mixing manifold was too long and it hung down in front of the hole leading to the hose.

Trim the nipple and bore the hole out a bit.

I had a similar idea to the sander--I tried to find one of those goofy vibrating platforms they sell on late night TV as exercise equipment. Who would have thought those things would be so expensive?

Good luck
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Old 02-24-2010, 09:48 AM
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there has to be equal pressure in the tank and hose. if not the media will fill the hose ( too much tank pressure ) or it will not fall into the stream ( too much hose pressure )if you are wearing out the media valve you are blasting with the tank instead of the hose. too much pressure behind the media in the tank. hose nozzles are consumables . they wear out period. mine are 3/8 x 1 1/4 , buy a couple of those.
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Old 02-24-2010, 10:34 AM
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HF blasting pot probs

Great feedback! I'll see if I can check each of the issues brought up to isolate the problem. It may be more than one thing anyway.

I definitely want to raise the unit up anyway bc I HATE bending over to open the mixing valve (and I don't like using my foot to do it).

I already replaced the moisture trap bc the little plastic screw thingie on the bottom stripped.

Thanks again.
Chaz
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Old 02-24-2010, 05:10 PM
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Quote:
Originally Posted by cboy
If the media seems to be bridging at the bottom of the tank, here is what some guys do. Strap a vibrating sander to the unit. If it is the hose of nozzle that is clogging up, that is a different matter.


Give that man a ceegar!

If that's not a great idea I have never seen one, thanks for the tip!!
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Old 02-24-2010, 05:36 PM
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Quote:
Originally Posted by shine
there has to be equal pressure in the tank and hose. if not the media will fill the hose ( too much tank pressure ) or it will not fall into the stream ( too much hose pressure )if you are wearing out the media valve you are blasting with the tank instead of the hose. too much pressure behind the media in the tank. hose nozzles are consumables . they wear out period. mine are 3/8 x 1 1/4 , buy a couple of those.
Shine,

How do you adjust the pressure difference between the hose and the tank?
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