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Some of you may remember me asking for help a couple falls back looking for a replacement mudhog valve after we had one overpressurize and blow the casing. We found one eventually off of a cotton picker in Arkansas believe it or not. Anyhow, when you switch the mudhog on, it robs nearly all the power from the drive wheels, to the point where it will hardly pull itself up a slight grade in 1st gear with the hydrostat wide open. Switch it off and it does a little better, but to get the combine back to full power, you have to use plugs in the hydraulic lines to completely bypass the mudhog. The system tests function correctly the way the mudhog manual says they should with the axle off the ground, so leads to believe the valve is operating correctly. Solenoid has been replaced just for elimination. No change. Could this issue be in the rear wheel hubs you think? I'm thinking the valve opens, sends enough flow to turn the wheels when off the ground, but robs the system when on the ground and is just wasted fluid flow when trying to move.
 

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Might try plugging the lines to the wheels at the valve one side at a time, loop the hoses at the disconnected wheel together. If it's a bad wheel motor this should isolate it. If that doesen't help, bypass the valve to see if that's it. TORQUE
 
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