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Allis Chalmers Discussion Forum

Hydraulic Question - What is this

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Jim Hunter

08-11-2010 06:50:42

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I have a AC-C with front loader. Not sure what this is but it is leaking. Top hose goes to hydraulic pump and selector valve, bottom hose and pipe go to selector valve and fluid reservoir. Is this some sort of pressure relief valve? The connection/nipple in front can I use that for other hydraulic equipment?

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08-11-2010 14:52:22

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 Re: Hydraulic Question - What is this in reply to Jim Hunter, 08-11-2010 06:50:42  
The nipple you refer to is not another hyd connection. Remove the cap and you will see the adjustable spring that sets the relief valve pressure. System is high pressure if the pump is the integral factory pump. Otherwise, put on a pressure gauge to check pressure.

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Jim Hunter

08-11-2010 08:09:32

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 Re: Hydraulic Question - What is this in reply to Jim Hunter, 08-11-2010 06:50:42  
Thanks Old - Would this still be a high pressure system I have a Vickers hydraulic pump that is connected to where the crank handle would normally go

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08-11-2010 14:44:59

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 Re: Hydraulic Question - What is this in reply to Jim Hunter, 08-11-2010 08:09:32  
yes.. a relief is mandatory in a hyd system.


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Mathias NY

08-11-2010 12:30:30

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 Re: Hydraulic Question - What is this in reply to Jim Hunter, 08-11-2010 08:09:32  
Even if it isn't a high pressure system, the pump will still need a pressure relief valve. That way when you reach the end of the cylinder stroke or if you overload the loader it won't damage the pump.

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08-11-2010 07:15:52

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 Re: Hydraulic Question - What is this in reply to Jim Hunter, 08-11-2010 06:50:42  
Yep simple pressure relief valve. Safety for a high pressure system that the Allis tractors have and most loader parts will not handle the higher pressure they have so the relief valve is added. Most like set up to pop off around 2500psi give or take a few psi

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