Troubleshooting John Deere Box Drills
John Deere box drills such as the 750, 1560, and 1590 have some special considerations when troubleshooting. Due to the design of these drills, certain mechanical components of the drill can bind or exert force on the load cells and affect the scale accuracy. If one side of the scale weighs significantly heavier or lighter than the other side, complete the troubleshooting steps below.
The drive chain should be loose enough to have an inch of deflection either up or down.
To see if the chain is affecting the weight, weigh on that side of the drill then remove the chain completely and weigh again. If the weight changes after removing the chain, then the chain must have been too tight.
The arm should connect to the clutch on the rear side of the shaft. Make sure the arm does not bind on the clutch as the drill is lowered.
To see if the clutch arm is affecting the weight, weigh on that side of the drill then remove the clutch arm completely and weigh again. If the weight changes after removing the clutch arm, then the clutch arm must have been binding.
The platform bolts must be installed with the heads towards the load cell. If they are installed with the threads towards the load cells, they may bind on it.