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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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More 1850 Hydraulic Questions

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Kelly MT

02-10-2005 20:45:16




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Just pulled the pump on my '66 1850 and have a few questions. This machine does not have a three-point system but I think the oil supply line would come from the top of the housing. On non three-point units did they run a pipe down to near the bottom and put a pipe cap with a 3/8" hole in it? It looks like this would rob oil from the system. Can I put a pipe plug here and not cause a problem? When I pulled the pump the pressure pipe from the pump to the valve body was missing it's O-Ring. Cause of low pressure I've been experiencing? Both diaphram gaskets inside the pump had spots that were mashed at points where they were not in the grove when assembled. Coments and instruction welcome, PK.

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bastar

02-10-2005 23:25:57




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 Re: More 1850 Hydraulic Questions in reply to Kelly MT, 02-10-2005 20:45:16  
I assume that you have the Depth Stop Type hydraulics (does not have any provisions for a three point hitch). There were two types of control valves used for control of the remote cylinders, a detent and a non detent. I assume that you have the detent type of valve (one that the lever stays in position to move the cylinder until it fully extends or comes to the depth stop. At that point, the lever should release and return to "N". The pump gets it's inlet fluid through the manifold attached to the pump. Outlet fluid flows through the long tube by the pressure relief valve, through the filter to the flow divider which takes off approximately 2 gallons for power steering and cooling. Pump output of fluid above the 2 GPM then flows to the remote valves & returns to the resevoir. When the remote valves go to the detent position, some balls are forced into a grove to hold the valve in working position. When the cylinder comes to the end of it's stroke, fluid flow stops and the main system relief valve opens and fluid flows down the tube that you talked about that has he cap with the hole drilled in it. The purpose of the drilling is a resistrictor to create back pressure to release the detent balls in the valve. DO NOT PLUG IT. IF YOU DO, THE FLUID FROM THE RELIEF VALVE WILL HAVE NO PLACE TO FLOW AND EXTREME HIGH PRESSURE WILL BUILD AND DESTROY THE PUMP.

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Larry from MD

02-11-2005 09:09:58




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 Re: More 1850 Hydraulic Questions in reply to bastar, 02-10-2005 23:25:57  
I belive there is an update on the plug with hole in it.I think you are to replace it with a tube with a bend so the oil is placed at the bottem of the hydrolic tank.The small hole was makeing too much heat and back preasure.



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Kelly MT

02-11-2005 14:20:40




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 Re: More 1850 Hydraulic Questions in reply to Larry from MD, 02-11-2005 09:09:58  
Any thoughts on the effects the mashed internal gaskets might have on the pump performance? PK



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