John,
Thanks for the response. I don't think its oil. I've used it less than an
hour total and oiled it a couple times through the air inlet (4-5 drops each
time). When I disassembled it it seemed well lubed. Its good to hear
people get them to work properly, that gives me motivation to keep trying.
The timing is interesting. I also didn't pay close attention during
disassembly but think I figured out a way to time it properly. I've tried
moving both pistons to the same end of their travel and timing the valve to
match and I've tried putting them all in the middle of their travel. Do you
have any other suggestions?
The problem seems to be that the pistons and the valve are very "tight". I
cannot move the valve by hand - I have to use pliers. I tried sanding it to
remove a little material from the barrel and that helped initially but once
assembled it got stiff again quickly. The pistons are also difficult to
move. When assembled I cannot move it by hand. If I slam one end on a work
bench it will move from one end to the other.
The tool worked initially, but in the course of few hours time and less than
an hours use I got this problem. If anything it seems to have a build up of
"paste" of oil and dust. I was using it to sand typical auto body filler,
so I figure it should be designed to live with that. I wiped the parts off
the first time but didn't wash them. My next try is to completely
disassemble, wash and lightly oil. I'm open to any and all suggestions.
Ben......
> -----Original Message-----
> From: shop-talk-owner@Autox.Team.Net
> [mailto:shop-talk-owner@Autox.Team.Net] On Behalf Of John T. Blair
> Sent: Saturday, December 30, 2006 8:55 AM
> To: shop-talk@autox.team.net
> Subject: Re: Harbor Freight Central Pneumatic Inline Sander
>
>
> At 09:50 PM 12/29/2006 -0500, Ben Zwissler wrote:
> >
> >After less than an hour of use my Harbor Freight Central Pneumatic
> >inline sander won't work properly. It started losing power and then
> >finally just quit working. I found two problems, the eight
> metal studs
> >that the nylon sanding plate rides on were gouging into the
> plate and
> >there was a lot of resistance in the piston and valve motion.
>
>
> Ben,
>
> I've got about 3 of them and personally think they are pretty good.
> Do you put power tool oil in them? How often? I had one
> that quit working - but I'd had and used it for several years.
>
> So I bought another one. This one, I figured, I'd better keep oiled.
> So I pulled the plug on the side and put some (a lot) of oil in it.
> Thought it might be like the impact wrenches. When I went to
> use it, it started flinging oil all over my work. So I tried
> to clean off the oil. To no avail. So I disassembled it to
> clean it. But when I tried to reassemble it, I could not get
> it to work. Well they were on sale again, so I bought a 3rd
> one and finished my project.
>
> When I was done the project, I proceeded to take the 1st one
> apart paying a little more attention to how it was assembled.
> It turns out that I had the timing off. So if you take one
> apart, pay particular attention to where the slide is and the
> position of the cam. Once I figured that out, I got the 2nd
> one running.
>
> The 1st one had quite because I hadn't used it in a while and
> apparently gotten some moisture in it and the cam had rusted
> in place. Once I took it apart and cleaned the cam and
> pistons, I was able to reassemble it.
> So now I have 3!
>
> John
>
> John T. Blair WA4OHZ email: jblair1948@cox.net
> Va. Beach, Va
> Phone: (757) 495-8229
>
> 48 TR1800 48 #4 Midget 65 Morgan 4/4 Series V (B1106)
> 75 Bricklin SV1 (#0887) 77 Spitfire 71 Saab Sonett III
> 65 Rambler Classic
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