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Allis Chalmers Discussion Forum
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WD hydraulics

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Bill's Tune and Till

01-20-2010 18:23:38




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I have a WD, 1948 model. The two point hyrdraulic will not descend for me when I pull the lever down. I can unhook the right cylinder (facing the rear of the tractor) and the left cylinder will descend. Both hoses attach into the hold positioning valve mounted on top of the pump. Right hose goes into right side of valve and left hose goes on the left side but behind the drain plug so the hoses are not lined up when attached to the positioning valve. I have reviewed the manual and adjusted everything I can but still cannot get the hitch to descend. I have tried two different cylinders on the right side with the same results. Anyone an expert on these hydraulic systems?

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bh58

01-21-2010 21:40:04




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 Re: WD hydraulics in reply to El Toro, 01-20-2010 18:23:38  
I had the same problem on my WD45 and removed the pump. First of all the third plunger (third from the rear) was stuck in and the rocker arm roller is totally worn out. The cam on the engine shaft just ate away the roller. I'm not sure if that is the real problem for the loader not to come down but it certainly could affect how much oil was pumping. I am still in the process of tearing it down and hopefully can get some parts for it. I also turned all those adjust ment screws which did little. This tractor also had the traction boost system with the lever from the drawbar up to the pump. The drawbar would stick which means the pump would lift the implements. I would give the drawbar a kick in which freed it up and the pump worked great for a while.
Good luck

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JMS/.MN

01-20-2010 19:28:44




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 Re: WD hydraulics in reply to Bill's Tune and Till, 01-20-2010 18:23:38  
What you call a drain plug is actually a port for attaching a remote coupler. It is pressurized when raising the lift lever. Lowering the lever does not lower the rams unless adequate weight is on them.



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Vito

01-20-2010 18:38:53




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 Re: WD hydraulics in reply to Bill's Tune and Till, 01-20-2010 18:23:38  
They are gravity down.I believe you need some weight on them.Then they will drop just fine.

Vito



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timok

01-23-2010 18:08:02




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 Re: WD hydraulics in reply to Vito, 01-20-2010 18:38:53  
Bill, make sure all the springs over the five relief balls are all there or replace them. Broken spring pieces get in the lowering valve and unloading valve, these valves must slide to unload and lower lift. All springs and unloading valve parts are available from agco. On line parts book gives part #'s. Some one may even have a online price listing. I also had a cam follower come apart and jam the pump. Have new springs and Orings in it and have to flush the loader system and install a filter assembly in the return line. Simple pumps, Keep every thing very clean, follow the parts diagram to reassemble, don't force any thing, dip all parts in clean hyd oil, heavy push to get the orings in bore and reinstall. HTH tim

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