Mower will only start by jumping of with red jumper cable to back side of solenoid and black to negative terminal on battery. I have replaced switch and solenoid but still nothing (not even a click sound). Manuals to this model (Murray 12.5HP, 40") 40706B are not available. Any suggestions? Thanks.
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If your starter solenoid is separate from the starter, then the following is to check the starter solenoid - (test bypasses solenoid)
1) take a battery jumper cable and connect one end to the positive post of the battery.
2) Turn the key to the ON position.
3) Then take the other end of the jumper cable used in step 1 and touch it to the connection on the starter (bolt) that has the cable coming from the starter solenoid You will see sparks when you touch this.
This should cause the starter and engine to crank over. If nothing happens, then it could be the starter is bad.
Starter test -
1) Try removing the starter from the engine.
2) Connect a jumper cable to the negative battery post and the other end to the starter housing, to make a good ground circuit.
3) connect a jumper cable to the positive side of the battery and then touch the bolt/post that usually connects to the starter solenoid.
The starter gear should spin when you touch this connection. If not , it's faulty.
If you have jumper cables or a jump box you can put the positive lead on the hot wire running to the starter and the ground to any clean (unpainted) surface on the mower and the starter will get power. Place your key in the on position and the unit should start if it is getting fuel.
it is hard to say exactly what the problem is, but it sounds like the starter, starter solenoid, and or a charging problem.
1. last year I am assuming that the battery was low on charge and once you jumped it, it would start with the key for the rest of the season? if yes your battery should be OK just make sure at the end of the season you disconnect it and store it some where cool but not freezing. if you had to jump it all the time the battery and charging system has problems,(cables)(?).
2. if you have to use the car to jump the mower make sure the mower and car are both 12 volt systems, and the car should not be running.
3. make sure the battery is fully charged and there is no corrosion between the cables and connections.
4. once you do the above you can jump the solenoid to see if the starter is bad, if it moves it should be good, if you have to jump the solenoid make sure the mower is in neutral and the wheels are locked so it cant jump forward.
also make sure all your safety switches are engaged, most mowers have switches on the seat, the blade engageing handle, and breaks.
The lights might have a bad connection at the battery, follow the wires from the lights for fuses and check them, some models have to be started before you can turn the switch back to turn the lights on.
Hello,This is normally caused by a defective inlet needle. The inlet needle
has a rubber tip, actually it's viton. With the mower sitting empty
that long the viton tip is probably hard and brittle so when the float
rises in the carb bowl the needle is not sealing and shutting off the
You can try removing the float bowl and replacing the inlet needle.
You can do this without removing the carb. If enough gas got into the
engine you may have to change the engine oil. OR checked all the usual suspects by insuring that the battery is fully
charged and will provide the starting load, the spark plug is connected
and none of the safety devices like having the machine in gear or the blades engaged are causing the problem,the next place to check is the solenoid.the solenoid is usually easy accessible and is an electromagnetic switch that engages when you energize the ignition,by turning the key to the start position. If you lift the engine cowling and look to the rear of the engine you
will see the solenoid. The positive (red) and negative (black) battery
wires will be attached to it at heavy posts as well as some other
electrical wires connected to smaller posts. First try gently tapping
it with a rubber mallet.Sometimes this electromagnetically activated switch gets stuck. If that
doesn't work, you can try jumping the solenoid switch. The safest way
is to take your battery jumper cables and using just one of the jumper
wires, connect one side to the negative post (black) on the solenoid
and then touch the other side to the positive post (red) of the
solenoid. Make sure your key is in the on position and the lawn mower
is otherwise ready to start. Be careful that the jumper wires do not
become tangled as the engine starts. Also, someone sitting in the seat
to prevent any mishap is the recommended and safest procedure. thanks for using fixya, take care.
Have a friend jump start the mower while you a seated on it. Turn the key to the "on" position. Connect the black jumper cable from a known good battery to a good ground on the mower and the red cable directly to the electrical connection of the starter. If the starter does not engage, it is faulty.
When you are jumping it off from the solenoid, there is no power going to the fuel shutoff solenoid under the carb if your battery is dead. If you can't hear the click from the fuel solenoid when you very first turn the key to on, it's not giong to start by jumping other than through the battery.