Cat 936F won't shut down

This loader is new to me.It will only shut down by lifting up on the accelerator peddle.Is this normal.Seems as though the key should shut it down.I now have the service manual for it and cannot find and reference to a fuel shutdown solenoid.Nothing shows up in the injection pump section ether.

Looking at the pedal, cable, and linkage it appears to me that raising the pedal is the correct engine stop mechanism. There is no fuel shutoff solenoid so shutting off the fuel pump via the accelerator cable would seem logical for that generation of machine.

Thanks Nige,Just looking at the manual it seems to have switches for everything but blowing the operators nose,seems like a $2 switch at the pump, would have been on some enginers mind.

Not to dissagree with Nige, he knows more than I ever will, but....

Not knowing your S/N I took a quick look at SIS and see this:



Looks like the same set up as we had on 966D's. They worked through a relay that was I belive if I remember correctly got their power from the small terminal on the alternator. Solenoid was energized to shut down. If the relay terminal on alternator wire had come off they would not stop. Also had one where the problem was a relay on the firewall at flywheel end of engine. If you can post the S/N I could look into it a bit more.

Ken, Agree a S/N would help clarify things. I took a stab at a prefix and picked 8AJ. That machine has a cable throttle and not even the Electrical Schematic shows a shutoff solenoid. The only solenoids on the whole machine are in the starter motor and the hydraulic implement control for the lift & tilt kickouts.

That shut down system uses power from the alternator "R" terminal to operate the shut down relay. The relay is controlled by the key switch providing a ground in the off position.
Later Bob

Thanks to all for your help,It is a #8AJ01502 .I will look further now that I have an idea what to look for, I just was unable to find any reference to a shutdown circuit in the manual,other than the operators manual.And it said "turn key to off position" That led me to think it was a key shutdown.

Only the 4TK-prefix 936F has the solenoid for an electronic fuel shutoff system. 4TK was the final iteration of the 936F before the model was discontinued by Cat in 1994. The earlier 8AJ and 9MK-prefix machines do not have the electrical shutoff unless they were modified by a previous owner.

Nige said:

Only the 4TK-prefix 936F has the solenoid for an electronic fuel shutoff system. 4TK was the final iteration of the 936F before the model was discontinued by Cat in 1994. The earlier 8AJ and 9MK-prefix machines do not have the electrical shutoff unless they were modified by a previous owner.

Click to expand...

It is strange that the operators manual does not mention using the foot control to kill the engine, just says let it cool down and the turn off the key. Maybe who ever was writing the manual was not real familiar with this hold over from an earlier time! Also figures I would pick the only wrong prefix when guessing which one to look at. Another reason people should at least include that when asking. Would hate to try guess where to look for information if someone just said a D6 or D8

I'll be honest I saw 3 options of S/N prefix and took a wild stab at the one in the middle - luckily for me in this case it just happened to be 8AJ.

I looked at the O&MM regarding starting/stopping then engine and it weirded me out too. It was only when I had a close look at the Electrical Schematic I was convinced, there was no shutoff solenoid marked on it, not even as an attachment. For the other 2 S/N prefixes it's there on the Schematic and in the Parts Manual. I wonder if it has anything to do with the 8AJ machine being built in USA as opposed to the 4TK in Belgium and the 9MK in Japan..?

That's why CMark's signature line says something like ........ "Well, what's your Serial Number..?"

Earlier F machines you should have to lift the pedal. Like Nige said, the last model was the one with the electronic shut off solenoid