Coats 7050ax help?

[jeepfreak81]

Hello, longtime lurker, but just joined again since I couldn't remember my username. I have been wrenching a long time, but not near as long as many of you. This is my first tire changer, and I don't want to just throw money at it, and it look like it can be expensive to fully refurbish. I have not found a ton of info on this model online.

I recently scored a really good deal on a Coats 7050ax. I knew the strongarm was broken when I bought it ($$$), which was a big part of why it was so cheap. The table and bead breaker worked when I tested at pickup, but there was obviously an internal air leak, which I have located, its dumping out a brass filter looking thing on the center pedal, which seems to be associated with the bead breaker.

The bead breaker worked, though slowly, when I got it home to test on a real tire.

The table doesn't have the nuts to spin with the duckbill in the tire. I think it may be the air leak, as the unit shows about 50psi on the top gauge.

Will the leak (that doesn't seem horrible at the valve be enough to not allow the table to spin?

 

[5ubtle]

Take it apart and find out more specifically what is leaking. My guess is that it uses nitrile o-rings. Don't worry about buying the Coats parts. They will likely be industry standard AS568 o-rings. More common o-rings can be obtained from the auto parts store. You can buy the whole 300+ piece kit (like what the auto parts store will have) from Harbor Freight for $8. For the less common o-rings, get them from McMaster Carr, Fastenal, or eBay.

 

[ovilla]

For my COATS 5060EX (electric turn table) I was able to find the o-rings at Menards. They are plain black rubber o-rings and cost like $3 for all 4 of them. Installed mine over a year ago and they are working fine. Make sure to pre-lubricate them as you are installing them and always run your machine with some oil in your air lines.

 

[gungatim]

if you search you can find the manual and parts diagram, that will help tremendously.

the lines can leak, they are just nylon push in type, the foot valves usually leak and can be repaired with oring kits off ebay, and the main spider on the turntable wears and leaks and is a huge PITA to get apart but can be done. the bead breaker is just a really large pneumatic piston and easily comes apart to change the o-rings as well. the inside is nylon so it usually doesn't break or gall, just o-ring wear.


I restored my model 5060 rim clamp a few years ago and it is pretty similar to yours. search for my thread posts, or let me know if you have questions.

 

[jeepfreak81]

if you search you can find the manual and parts diagram, that will help tremendously.

the lines can leak, they are just nylon push in type, the foot valves usually leak and can be repaired with oring kits off ebay, and the main spider on the turntable wears and leaks and is a huge PITA to get apart but can be done. the bead breaker is just a really large pneumatic piston and easily comes apart to change the o-rings as well. the inside is nylon so it usually doesn't break or gall, just o-ring wear.


I restored my model 5060 rim clamp a few years ago and it is pretty similar to yours. search for my thread posts, or let me know if you have questions.

Thanks, I had searched and read your threads before posting this. It really kept seeming like an air pressure issue, but the leak at the valve did not seem that bad. It must have been venting a lot more air than it felt like.

I removed the valve tonight that was leaking and bypassed it, and the entire machine came to life. The old valve looked in really rough shape, so for $89 I'm just replacing the whole thing.

There is another small leak at that turntable spider mentioned above, but it didn't affect it at all. I was able to peel one of my Willys tires off the rim effortlessly.

 

[Jbullfrog]

The 3 pedal valves are plumbed with a common feed and tees on the left and center and a 90 on the right. The brass filters are to contain the air oil in the valves on the exhaust ports. I have a 7050ax that came from a tire shop. It gets finicky if not used for a few weeks until it gets air oil thru the valves. Mine has an water trap and oiler combo on the air inlet mounted at the pivot of the breaker arm. Keep the air dry and make sure it is getting enough air oil into it.

 

[jeepfreak81]

The 3 pedal valves are plumbed with a common feed and tees on the left and center and a 90 on the right. The brass filters are to contain the air oil in the valves on the exhaust ports. I have a 7050ax that came from a tire shop. It gets finicky if not used for a few weeks until it gets air oil thru the valves. Mine has an water trap and oiler combo on the air inlet mounted at the pivot of the breaker arm. Keep the air dry and make sure it is getting enough air oil into it.

When I get this in its permanent spot I plan to plumb a dedicated line on the wall and add the drier/oiler then. I've got some rearranging to do first.

That center valve just plain fell apart. I have o-rings here to try, but figured I'd order a known good one. I was messing with my jeep tire tonight learning how to use it. It was working well, but I'll definitely need to anchor to the floor.

Thanks for the help guys. I kept pricing random parts and the different motors and such were $400-1200 so my good deal wasn't looking so good. Now that I have it working, if I sell the Snap-On balancer it came with (I already have a Coats 1055) I'll have a free changer. My dad thinks he wants that for motorcycle tires though.

 

[gungatim]

if your center turntable spider is leaking but still working leave it alone if you can. if you saw my post you saw how difficult it is to get the turntable off, without a torch and good pullers you will be frustrated!! I replaced the entire plastic piece since it got melted with the torch, but it wasn't very expensive.

glad you figured it out, having your own machine is a blessing and a curse, it's great for when you need it, but when all your friends want to use it, it becomes a pain!

couple tools that are helpful are a quality valve stem puller, good screwdriver style valve core puller, and I use a couple HF tire levers to pull the bead over the duckbill.

I buy valve stems in bulk when I see good deals on them at the flea market or online, and I buy large jugs of airsoft beads that I put in for dynamic balance since I only have a bubble balancer. the beads take care of any thing that isn't quite right manually balancing or if I don't have enough or the right weights (which is most of the time, lol).

 

[jeepfreak81]

if your center turntable spider is leaking but still working leave it alone if you can. if you saw my post you saw how difficult it is to get the turntable off, without a torch and good pullers you will be frustrated!! I replaced the entire plastic piece since it got melted with the torch, but it wasn't very expensive.



glad you figured it out, having your own machine is a blessing and a curse, it's great for when you need it, but when all your friends want to use it, it becomes a pain!



couple tools that are helpful are a quality valve stem puller, good screwdriver style valve core puller, and I use a couple HF tire levers to pull the bead over the duckbill.



I buy valve stems in bulk when I see good deals on them at the flea market or online, and I buy large jugs of airsoft beads that I put in for dynamic balance since I only have a bubble balancer. the beads take care of any thing that isn't quite right manually balancing or if I don't have enough or the right weights (which is most of the time, lol).

Yeah, I wasn't going to tear into it right away. I have a torch and pullers, but for as often as I plan to use it I think it will be fine. I'm goiing to take the Strongarm cylinder to a machine shop to see if the tube can be fixed though.



The table was working fine the other night so I'm going to place a shut off valve on the line I plumb for the tire machine. I ordered a valve stem install tool, a screwdriver style core puller and some nylon clamp covers the other night. I already had a great set of tire spoons. The Snap on Balancer that came with it has about 200 valve cores laying on it. I won't need those for awhile. I'm trying to get my dad to let me sell the Snap on balancer, but he wants it for his motorcycle tires right now. I already scored a cheap Coats 1055 a few years ago, and have barely used since I did not have the mounting machine.



I'm also lucky I live in the middle of nowhere and have very few friends, so I don't get much traffic. I do wish I had a couple shop buddies sometimes, but I work too much



Over the past few years I've gotten lucky on cheap equipment from dealers upgrading, and craigslist.

 

[gungatim]

Nice!! Love the car, model a ?

 

[ovilla]

For steel clamp-on or sticky weights, I’ve found www.greggsmithequipment.com to have some decent packaged prices. Thats also where I’ve bought schrader valves in bulk and my tire patch toolbox kits too. Anyway, that’s what I started with and now I only order wheel weight boxes in the sizes I typically go through. Also, make sure friends ALWAYS take their old tires with them or they will start multiplying very quickly. You can dispose of any sized tire at Wallmart Tire Centers for just $1.50 per tire.

 

[malbojah]

Ready to love me?

https://www.nytechsupply.com/downloads/tire_changer_parts_manuals/Coats_7050AX-EX_Parts_List.pdf

Thats where I found the manual for my RC-20A

 

[jeepfreak81]

Nice!! Love the car, model a ?

Yeah, a 1929 A. I drug it out of a barn in pieces.

Ready to love me?

https://www.nytechsupply.com/downloads/tire_changer_parts_manuals/Coats_7050AX-EX_Parts_List.pdf

Thats where I found the manual for my RC-20A

Thanks! The guy was a stand up guy, the manual arrived in the mail Saturday.

For steel clamp-on or sticky weights, I’ve found www.greggsmithequipment.com to have some decent packaged prices. Thats also where I’ve bought schrader valves in bulk and my tire patch toolbox kits too. Anyway, that’s what I started with and now I only order wheel weight boxes in the sizes I typically go through. Also, make sure friends ALWAYS take their old tires with them or they will start multiplying very quickly. You can dispose of any sized tire at Wallmart Tire Centers for just $1.50 per tire.

I'll check them out, I've bought a bunch of lead weights on Amazon or from the local tire shop. Harbor Freight also has the stick on weights

You aren't kidding on the tires, I just found out about the Wal-Mart deal last week actually.