Posted by the tractor vet on March 31, 2009 at 17:50:15 from (76.212.228.167):
In Reply to: Re: 856 MCV Issues posted by Thad Barker on March 31, 2009 at 17:14:06:
First off check the fluid level , Next there are two ways of bleeding the system , first off run the engine at 18-2000 rpm and turn the steering wheel to the left and keep on turning it as this is one way to bleed the system. and makes no mess to clean up. Now there maybe a suction leak between the speed transmission and the range trans mission or there is a vary small chance that the pickup tube has a crack in it and allowing it to suck air , now one can OVER fill the system by three to five gallon and if it is and air sucking problem this will help as the fluid level will be higher then the suction tube or the O/Ring between the two transmissions . Now it may also be that this tractor was used tomuch when new and it may be time to rebuild the MCV . A new spring kit and seal and gskt pkg maybe in order along with a new MCV pump. But before i would start buying parts i would put my gauges on it along with my flow rater and see what the pump is putting out and just how much .Now i know not everybody has a 4500 dollar flow rater setting in the shop and all the fittings and hoses to run all the tests so sometimes to save a few bucks one must spend a few bucks and let someone that does have the equipment to run a few tests and the knowledge . Now as to his problem with it sorta FREEWHEELING when slowing down i would say that when the hyd fluid moves forward it is either low or that there is a crack in the suction tube or that the oil level is low and exposes the suction tube and she sucks air . Now for the second way to bleed the air is to remove the orifice plug with the engine off then get up on the tractor and start the engine and be ready to shut it off FAST as when it does pick up prime she will dump a bunch of oil fast.
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