The 1840 has no clutches, it is a hydrostatic drive. Under the seat there are spring centering mechanisms that return the levers to center position. look at the spring mechanism while moving the lever and see if the spring has free play either way, if so adjust the nut on the rod till the spring eliminates any free play. If the unit still moves you may have to change the rod length to the drive pump. Look it over carefully before you do anything so you understand it before changing anything.
Another issue, if the unit has high hours check ALL the ball joints in the lever linkage for wear as it is near impossible to get the centering mechanism to work if there is extreme wear in the joints.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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