My massey 135 tractor, gas , 1980 model, starts but stops the moment you take your hand off the key. new battery, new switch, new starter

SOURCE: Toro lawn tractor : tractor will not start

On most riding mowers there are several switches that must be actuated before it will start. First, make sure that blades are disengaged. Also, if there is a handle that engages and disengages the blades, you might try holding it in the dis-engage position in case the switch is out of adjustment. There is probably one under the seat also. This switch kills everything if you are not sitting in the seat for safety reasons. The switch here could be out of adjustment or mis-positioned. Also, make sure the parking brake is set, and the gear is in neutral, and not forward or reverse. Also, even if the parking brake is set, you might try pressing the brake all the way down while starting, as this switch might be out of adjustment. All of the switches should be easy to locate and adjust. Also, you should check the battery. It is possible that you left the key on by mistake and drained it.

Hope some of this helps.
C

SOURCE: Operator's manual for a Massey Ferguson 65 tractor

Go to google search engine and type in your tractor most of the time it will give you lots of web sites to look at.

SOURCE: I have massey ferguson 383 tractor that sat for 3

I would check to make sure that you are not getting air into the fuel system. With a tractor sitting that long I would also be concerned with 1. bad fuel, 2. bad fuel injector pump, 3. clogged fuel filter, 4. water in fuel system, 6. intake/exhuast valves siezed. You will just have to start with a process of elimination.

SOURCE: need a wiring diagram for a massey ferguson 135 tractor

I need a wiring diagram for my massey ferguson 135 tractor regards ****

SOURCE: Craftsman Lawn Tractor, 18 HP, 44" Cut; No SWtart!

Check the by pass switches on the seat, clutch pedal, and check the fuses.