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Allis Chalmers Discussion Forum

WD Hydraulic update

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10-08-2003 08:36:29

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Hello all. I have a couple of questions about my WD. Iím going to modernize the hydraulics using the factory pump, a selector valve, a set of spool control valves, filter, and lots of plumbing. I plan to use the selector valve to go between the spool valves and the factory lift that Iíve converted to a 3-point setup. I have a couple of questions though. My book lists the capacity of the hydraulics as 5 quarts. That isnít a lot of oil so I know I will be limited to the cylinders that I can use on equipment. That is where the first question comes into play. If I remove my belt pulley and put the block off plate in its place, will I get more capacity for the hydraulic oil? If so how much? Seems as though I have seen something on that in the past, but my memory fails me. Also can anyone tell me what kind of volume the factory pump puts out? I know that they are a high pressure low volume system, but how low. It seems to raise the factory rams fast enough. Thanks in advance for you thoughts.

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10-09-2003 09:28:53

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 Re: WD Hydraulic update in reply to CWL, 10-08-2003 08:36:29  
One thing that I thought to add that I didn't mention in my original post. When working with a two way cylinder the volume of oil used to extend the cylinder is dependent on the cylinder rod. This is because as the cylinder is extended oil from the retract side of the cylinder is returned to the reservoir. If all the air is out of the system you only loose the volume of the cylinder rod. I have thought about ways to add on tanks, but I hope that will not be necessary. I'm mainly thinking about a small wheel disk, pull type brush cutter with a cylinder for lift, small speed mover, etc.. Most of these can use small relatively short stroke cylinders.

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Dave Grubb

10-09-2003 08:22:08

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 Re: WD Hydraulic update in reply to CWL, 10-08-2003 08:36:29  
I think it is simple to mount a ready made reservoir on the left frame rail with the full level to be on the same plane as the original filler plug and plumb into the original reservoir drain plug. I have seen guys mount a tank on the right frame rail and plumb into fittings they have welded into the belt pulley blank off plug. Just remember that the tractor system is 3500 psi not 2000 psi. The pump output volume is low compared to a 2000 psi system and will give a slow acting cylinder.

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keith lehmann

10-11-2003 20:27:20

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 Re: Re: WD Hydraulic update in reply to Dave Grubb, 10-09-2003 08:22:08  

mount pump to crank shaft on WD 45.

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Dave K (SWFL)

10-08-2003 14:24:56

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 Re: WD Hydraulic update in reply to CWL, 10-08-2003 08:36:29  
This system is designed for the low volume, high pressure rams made by AC for the system. Any time you use a large volume ram you will probably not have enough fluid. The lift arm rams are small diameter pistons you will notice.

What I have seen is aux fluid tanks mounted on top of the hyd sump on the WD with a hole drilled for gravity flow, and fittings to connect the two. Many folks here have other methods so you should get a better response from them.


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