Early model 416's were mechanical linkage to the control spool. Later models added solenoids to shift forward and reverse. This has a block with solenoids on each end.
All models have a separate solenoid for neutralizer function control by the push button on the speed control shift lever and loader control lever.
They are different were as some used current through the push buttons for the disconnect neutralizer solenoid and later models use current through the push buttons to power the transmission shifter.
When a failure occurred in the neutralizer circuit or a push button stuck, early models only need to disconnect the push buttons to make the transmission work but, later models must have a jumper installed to bypass the push buttons and keep power to the transmission control lever.
Current models are all controlled by an ecm.
An easy test to see if the transmission solenoids (if you have them) is to place a screw driver tip on the end to see if it is magnetized when you place it in forward or reverse.
All models also have a front wheel drive solenoid but, it is located in different areas for different models.
Test the push buttons to see if you have one stuck. Then check the wiring to see if the circuit is the problem. If you have the electric shift control handle, check the fuse first, the inspect the wire and circuits. If this is controlled with an ecm, you can still check the shift control wiring but, to test the ecm, a service call to the dealer is needed. Some models did include a red light in the fuse panel area to indicate an active fault is in the ecm circuit.
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