Posted by Owen Aaland on February 17, 2011 at 08:01:58 from (63.167.132.13):
In Reply to: Remove front hyd pump posted by Larry B 1486 on February 17, 2011 at 04:48:43:
The pump is not being primed. That accounts for the lack of hydraulic pressure in the control circuits. The cause is going to be a leak at the seal between the rear frame and center section. A weak pump can make this problem more noticeable. The extra five to seven gallons of oil insures that this seal remains below the oil level so air does not enter the system causing the pump to lose prime.
The fact that you were having problems with the steering is cause for alarm. Not just for problems with the steering but it can also indicate the range transmission and differential are not getting proper lubrication.
The MCV pump provides 9 GPM flow to the MCV where a priority 3 GPM is sent to the steering and then to the brakes, seat and diff lock on tractors so equipped. Tractors with TAs also use this flow to control and lube the TA. The oil flow remaining after the 3 GPM is drawn off is sent to the oil cooler and the back through the MCV and routed back to lube the range transmission and differential. Providing the flow divider is working properly in the MCV, if you are experiencing a loss of steering, most likely there is no oil flow going the oil cooler and the rear frame. A weak MCV pump can lead to rear end failures in these tractors.
There should be four bolts with copper washers/gaskets under then in a rectangular pattern. Those are the ones that hold the pump to the MCV assembly. The rest hold the MCV to the center section.
You will need a gasket and O-ring between the MCV and center section. There are two more O-rings to mount the pump. Tractors with S/N 15000 and above also have a spacer plate so an additional gasket and O-ring are used. You would be well advised to go through the entire MCV assemble while it is off. You can inspect for worn springs and scoring on the valves as well as replacing all the O-rings.
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