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MichaelT 
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Joined: 30 Oct 2023
Location: Missouri
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 Topic: Allis Chalmers D17 with a new idea 506 loader
Posted: 29 Sep 2024 at 1:58pm |
I have a New Idea 506 loader and it needs a new hydraylic control valve The valve on there now may be the original valve and there are no model numbers I would like to install a after market two spool valve but l dont know what to order Northern tool is very close to my home and they have a number of valves shown on their website Any help would be appreciated
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Ray54
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Joined: 22 Nov 2009
Location: Paso Robles, Ca
Points: 4581
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Posted: 29 Sep 2024 at 3:30pm |
What is the machine doing to make you think the control valve is worn out? I have a lot of old to very old equipment. I have thought the valves were bad on my junk, but 90% of the time it ends up the seals on the piston in the hydraulic cylinder are the problem. They are cheap in most time in comparison to a valve.
If you really need a valve you need the gallons per minute of the pump you have and how much pressure it is able to make. Then a valve able to handle your GPM and PSI, or more and all is good.
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DiyDave
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Joined: 11 Sep 2009
Location: Gambrills, MD
Points: 51963
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Posted: 29 Sep 2024 at 3:45pm |
Look up your tractor's specs on the internet, or in your manual. You need to know the series of your d-17. Once you have the flow (GPM) and pressure, (PSI), go to surplus center.com, and look for valves... 
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DrAllis
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Joined: 12 Sep 2009
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Posted: 29 Sep 2024 at 3:52pm |
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Any "live" hydraulic pump on any D-17 shouldn't exceed 12 GPM at full throttle. Pressures wouldn't exceed 2400 psi either. We are talking about a 2-way "all hydraulic" loader with tilt cylinders on the bucket, right ??
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MichaelT
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Location: Missouri
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Posted: 29 Sep 2024 at 4:55pm |
so it is a D17 series 4 The tubes bucket are not leaking One tube on the lift are is leaking just a bit but the lift works just fine for now The bucket will curl up and then steadyly fall back down and if l lift the bucket about waist high and sit on it it will collapse
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MichaelT
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Posted: 29 Sep 2024 at 5:03pm |
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That is correct, the tubes on the bucket curl are not leaking
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DrAllis
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Posted: 29 Sep 2024 at 5:22pm |
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It would be foolish to replace the factory OEM valve stack with some aftermarket/cobbled up hydraulic valve. If you can (and you may not be able to) swap the bucket hoses over to the other set of couplers. Or, you could roll the bucket clear back and just unplug the hoses to the bucket while rolled back. Bucket still settles??? it's not the valve. Reseal the bucket cylinders. They are leaking INTERNALLY, not externally.
Edited by DrAllis - 29 Sep 2024 at 5:25pm
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MichaelT
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Posted: 29 Sep 2024 at 6:51pm |
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Thank you l can swap the lines, l will do that in the morning
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HudCo
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Joined: 29 Jan 2013
Location: Plymouth Utah
Points: 3608
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Posted: 29 Sep 2024 at 9:50pm |
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rams dont have to be leaking on the outside to be the problem, i would re pack the pistons on the rams if yowant to prove it swap the lift hoses with the bucket hoses and see if the problem moves to the other control i really doubt the control valve is the problem
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Ray54
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Joined: 22 Nov 2009
Location: Paso Robles, Ca
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Posted: 30 Sep 2024 at 10:16am |
At the first start of the day you can easily run a no cost test. Set the bucket at the height so you can sit on it. As soon as down lift it back and push it down 5 to 10 times as quick as you can. Now start feeling the tube of the ram. If it is warmer, maybe even hot you have found your leak. The oil leaking around the packing/seal on the piston inside the ram produces heat.
This little trick should be part of tractor 101. But I was past 50 before it was explained to me. If you still have question about the bucket tilt cylinders, raise the boom and run it up and down a number of times and compare the temperatures. |
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DrAllis
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Posted: 30 Sep 2024 at 10:43am |
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Probably for best test results try and have the bucket cylinder in the middle of its stroke.
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MichaelT
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Posted: 01 Oct 2024 at 9:25am |
so l intend to test the bucket curl cylinders this morning to see if they get warm by Opening and closing the curl Just a question, the valve is a two spool, is it possible to disconnect the lines from one side of the valve and run only the bucket lift or only the curl? I have tried to switch the lines from one side to the other and neither the bucket lift or the bucket curl will operate. I have to get this fixed , l have 30 tons of gravel to spread, Thanks for your help
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DrAllis
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Posted: 01 Oct 2024 at 10:17am |
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You MUST swap hoses in PAIRS to the same right/left connections on the tractor. You cannot use just one hose. All four must be plugged in. You also must have the SAME brand/type of hose ends and couplers on both sides or you cannot do a hose swap.
Edited by DrAllis - 01 Oct 2024 at 10:32am
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