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Allis C hydraulic pump problem

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Mark

06-18-2003 19:41:08




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The hydraulic pump will only raise my belly mower but will not lower when the control valve is moved to the "lower" position. I've had the pump apart several times and cleaned and inspected it but cannot correct the problem. I thought I had it figured out when I backed out the relief valve insert to about 1/2" below the top of the hole, but the cylinder would not hold pressure, but it would relieve it. I pushed the relief valve insert incrementally into about 9/16" below the top of the hole and now have the same problem. I'm thinking I may need to rebuild the relief valve assembly, or buy a rebult pump. Does anybody make a rebuild kit for these pumps? Any help would be appreciated.

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Butch(OH)

06-19-2003 04:35:22




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 Re: Allis C hydraulic pump problem in reply to Mark, 06-18-2003 19:41:08  
The drop valve and pressure relief valve is one and the same as you discovered when you backed the relief valve plug out far enough to allow things to drop. the B C pumps have several commen problems but dropping isnt one of them, usualy things drop when you dont want them to,LOL. Anyway I'll take a stab at it. Sounds to me like your missing part of the drop valve portion of the drop-relief valve, did it ever work? From the top down here are the parts that should be in that valve stack. 1. the plug that you adjusted 2. spring 3. valve seat 4. check ball 5. drop activator rod. The rod is activated by the flat spot on the rotating operater shaft, pushes against the ball which in turn pushes the relief valve seat off of its seat. If you need detailed instructions a manual is nice. There is a couple tricks to removing and reinstalling the valve and the activator shaft correctly and without ruining more parts.

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Mark (Ohio)

06-19-2003 19:03:44




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 Re: Re: Allis C hydraulic pump problem in reply to Butch(OH), 06-19-2003 04:35:22  
Butch,
Thanks for the response. Mine appears to be a different setup then what you stated, so maybe we can figure this thing out. Here is how you described the stack versus what I have, going from top down after the top pipe plug is removed: Yours: 1.The plug I adjusted (Relief valve insert); 2. Spring; 3 valve seat; 4. check ball; 5. Drop activator rod Mine: 1. The plug I adjusted (Relief valve insert); 2. Ball, which fits inside insert; 3. Relief valve spring plunger; 4. Spring; 5. Relief valve thimble, which rides against the control shaft. The plunger(3) fits inside the spring (4) on mine, and this all in turn fits inside the thimble (5). The plunger top fits against the ball inside the insert (1). Item 2 thru 5 are installed from the opposite end. This is how it is shown in my manual to assemble this thing, but I've found errors before in the manual! We have a little different nomaclature here. I'm not exactly sure what you are calling the valve seat or the drop activator rod, so maybe you could clarify that for me. This pump did work at one time since I had the tractor. As you mentioned, there are tricks to assembling the pump, also disassembling. When I disassembled the pump control rod the thimble and spring shot out onto the floor, at least that's all I found! I wasn't expecting that. Maybe something else fell out, too.

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Butch(OH)

06-20-2003 06:21:53




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 Re: Re: Re: Allis C hydraulic pump problem in reply to Mark (Ohio), 06-19-2003 19:03:44  
Mark, was going from memory as my book has been borrowed and not returned, sorry for the part names, sounded better than "valve thingy". If I had my book I could explain better with accurate names but here goes. The way the system drops the load is by knocking the relief valve off its seat. You seem to have a good handle on how the thing basicaly works. I am sure that I put mine together per the book as the first time I had the spring shooting parts on the floor deal too. Remove the valve shaft again and the parts that come out the bottom of the relief valve bore. blow air into the bore to remove excess oil and look into it with a strong light. You should see what I am calling the relief valve seat and it should have a small hole, maybe 1/16" and a seat area for a ball "about 1/8". Stick a punch in the bore and you should be able to push the relief valve off the seat but only with considerable effort. All the "drop valve" does is push that relief valve off of it's seat via what ever is between the valve shaft and the above discribed relief valve seat, my so-called "activator". That is where your problem is. Parts not in right, worn or something. Sorry for the confusion and I can't do much better with details until the %%&^#$@!!! brings my book back

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Mark (Ohio)

06-20-2003 20:39:19




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 Re: Re: Re: Re: Allis C hydraulic pump problem in reply to Butch(OH), 06-20-2003 06:21:53  
Butch,
I pushed the relief valve seat out and used my dremel tool to clean it out where the ball rides. I reinstalled the thimble first and started operating the control rod, figuring I would see the thimble go up and down as it rode against the flat part of the control rod. It didn't move up and down like I thought it would. I found out that the control rod was not quite in all the way, and that didn't allow the thimble to drop onto the flat and relieve the pressure. I took a block of wood and hammer and tapped the control rod oil seal so the rod could go in about 1/32" further, and that did the trick. I reinstalled everything and tapped the seat to about 9/16" below the top of the plug hole and it raises and lowers perfectly! Thanks for your help. (After removing and tearing this pump apart half a dozen times, I think I could do it in my sleep now!) Mark

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