Sunday, July 5, 2009
Great IH parts web site
For web site specializing in IH tractor parts check out http://www.redrunrite.com
I have had many people contact me for repair information of IH Farmall tractors. The most asked service questions are on the Hydraulic systems of 706 through 1586 series tractors. The systems are basically the same for all the models in between ( 756 766 786 806 826 856 886 966 986 1066 1086 1206 1256 1456 1466 1486 1468 1486 1566 1568 1586).
The hydraulic system on all these models use the rear frame housing and clutch housing as a common oil reservoir. The oil level should be maintained at the full mark on the dipstick located in the front right corner of the operators platform.CaseIH Hy-Tran fluid is the preferred fluid to be used in this system. Other fluids will work but none are a exact match of Hy-Tran.
There are 3 pumps that supply oil flow and pressure, 1) MCV (multiple control valve) pump/ power steering pump. 2) Hitch pump/main hydraulic pump. 3) PTO pump. I will start with the MCV/ power steering pump .
This pump delivers 9 gallon/minute and approximately 2300 psi at rated engine speed for all model up to 86 series which use a 12 gpm pump. The flow and pressure is regulated and directed in the MCV. The pump is mounted to the inside of the MCV and is gear driven by the PTO driven gear located in the left side of the clutch housing. Pressure and flow from this pump through the mcv 1st) supplies power steering then 2nd) supplies power brakes . 3rd) supplies pressure to shift the TA. 4th) Lubricates the transmission ,differential and final drives.
The 2nd pump is located on the left side of the tractor and just ahead of the rear axle housing. There you will see a mostly square plate bolted to the rear frame. The pump is bolted on the inside of this plate. The pump is gear driven similar to the mcv pump also by the PTO drive train. This pump is a 12, 15 or 17 gpm pump depending on how the tractor was ordered or whether the pump was changed before. All 3 sizes will are interchangeable. This pump if working properly should deliver up to 2500 psi to the system relief valve where the pressure is regulated to the maximum pressure allowed by the relief valve and then powers the 2pt./3pt. hitch and then the remote valves. ( hitch has priority over remote valves).
The 3rd pump is located on the input shaft of the PTO unit inside the rear frame. This pump supplies pressure to the clutch packs of the PTO. Pressure is controlled by the control valve on the left top of the PTO unit. This is just a Brief outline of the workings of the 3 hydraulic systems. JLS
The hydraulic system on all these models use the rear frame housing and clutch housing as a common oil reservoir. The oil level should be maintained at the full mark on the dipstick located in the front right corner of the operators platform.CaseIH Hy-Tran fluid is the preferred fluid to be used in this system. Other fluids will work but none are a exact match of Hy-Tran.
There are 3 pumps that supply oil flow and pressure, 1) MCV (multiple control valve) pump/ power steering pump. 2) Hitch pump/main hydraulic pump. 3) PTO pump. I will start with the MCV/ power steering pump .
This pump delivers 9 gallon/minute and approximately 2300 psi at rated engine speed for all model up to 86 series which use a 12 gpm pump. The flow and pressure is regulated and directed in the MCV. The pump is mounted to the inside of the MCV and is gear driven by the PTO driven gear located in the left side of the clutch housing. Pressure and flow from this pump through the mcv 1st) supplies power steering then 2nd) supplies power brakes . 3rd) supplies pressure to shift the TA. 4th) Lubricates the transmission ,differential and final drives.
The 2nd pump is located on the left side of the tractor and just ahead of the rear axle housing. There you will see a mostly square plate bolted to the rear frame. The pump is bolted on the inside of this plate. The pump is gear driven similar to the mcv pump also by the PTO drive train. This pump is a 12, 15 or 17 gpm pump depending on how the tractor was ordered or whether the pump was changed before. All 3 sizes will are interchangeable. This pump if working properly should deliver up to 2500 psi to the system relief valve where the pressure is regulated to the maximum pressure allowed by the relief valve and then powers the 2pt./3pt. hitch and then the remote valves. ( hitch has priority over remote valves).
The 3rd pump is located on the input shaft of the PTO unit inside the rear frame. This pump supplies pressure to the clutch packs of the PTO. Pressure is controlled by the control valve on the left top of the PTO unit. This is just a Brief outline of the workings of the 3 hydraulic systems. JLS
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