Posted by Owen Aaland on February 28, 2009 at 19:59:38 from (65.165.246.54):
In Reply to: 1206 won't move posted by D.Greig on February 28, 2009 at 10:39:44:
The hydraulic oil pumps in these tractors are both below the full oil level. The inlet to the hydraulic filter is above that level to keep the oil from draining out when changing the filter. The other place where the suction side of the pump is above the oil level is where the clutch housing and the rear frame are joined together. An leak of the seals at either of these locations will allow air to enter and can cause problems when out of use for long periods. Over filling the system with hydraulic fluid will keep any air from entering and should solve any lose of prime problems. The down side of running the fluid level a couple if inches over full is that you will have some of the extra oil coming out when the filter is changed.
If you can not pick up the prime by turning the steering wheel with the engine running, you can take out the access plug for the flow divider orifice. It is located on the back side of the MCV, takes a 5/8 inch wrench. The orifice is first in line on the pressure side of the pump. (The plug you took out is located on the other side of the flow divider valve. There will be no flow there until you get enough flow to move the flow divider valve.) Start the engine with the plug out. Be prepared to shut down quickly. The orifice will shoot out three gallons per minute (five GPM on 86 and newer series) at any engine speed. If that still doesn't work you can add air pressure to the fill tube on the range transmission cover.
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