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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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