Cat 315c shutdown problem

[CUMBRIA6039]

I am still having problems with this 315c shutdown, the shutdown solenoid is staying engaged all the time unless I disconnect the main shut off key or remove solenoid fuse with out testing anything I replaced the timer module and it was exactly the same
I checked the four wires going to the module and found I have one 24v power all the time, one going to solenoid, one going what I think is ground and one doesn't appear to have anything would anybody have a circuit diagram for this circuit thanks

 

[Nige]

You have 4 wires to the shutdown timer -

107 Red - 24V+ from battery
200 Black - Ground
308 Yelllow - 24V+ from key switch
307 Pink - supply to shutdown solenoid.

So you should have 24V beween wires 107 & 200 all the time the master switch is closed.
You should have 24V between wires 308 & 200 ONLY when the key switch is in the ON position.
You should have 24V between wires 327 & 200 ONLY when the shutdown timer is sending an "energized" signal to the shutdown solenoid.

Machines from S/N AKE197-Up and CJC1019-Up were equipped with a secondary shutdown switch. This switch is connected into the 308 Yellow wire before the shutdown timer. The switch is located under a red flip-up cover on the floor by the left side of the operator seat. If you don't have 24V between 308 Yellow & 200 Black with the key in the on position then the secondary shutdown switch is the first place I would be looking.

 

[Nige]

Edit: I should have said ........... If you don't have 24V between 308 Yellow & 200 Black at the shutdown timer with the ignition key in the on position then the secondary shutdown switch is the first place I would be looking.

 

[Nige]

Edit #2 (and this is surmising on my part): If you don't have 24V between 308 Yellow & 200 Black at the shutdown timer with the ignition key in the on position, then I would suspect that you should have 24V between 307 Pink & 200 Black, thus indicating that the shutdown timer is sending a signal to the solenoid telling it to shut down the engine. The absence of the 24V between 308 & 200 should cause the presence of 24V between 327 & 200 if I'm reading it right.

 

[CUMBRIA6039]

thanks for reply I was at it again today when switch is turned off there is no power in yellow wire to timer but when switched on there is going to yellow but the pink wire from fuse stays powered all the time and is keeping solenoid powered all the time should the power go away from pink wire after a while.Is there a main relay on this do you know , I did unplug alternator in case of some feed to a relay but didn't make any difference
when switch is turned off I hear a change in revs with the solenoid unplugged but there is power all the time to solenoid

 

[simonsrplant]

I don't want to take off on a tangent, but, I've seen oil contamination in the harness between ECM and loom cause erratic electrics on these. More so if the engine has regular top ups with oil as the ECM harness and connectors are just down the side of the head near the filler cap. Gave me all sorts of problems till I took the connector block clean out and soldered everything.
Might be worth a peep

 

[ram_milan]

Dear Sir

I have problem with my Komatsu Excavator PC220-7 that when applying full load for any function its getting shutdown by itself. There is no any error code on dash board. I checked fuel line for air its ok and also checked fuses all ok.
What could be reason for this ?
Please help me to sort out this problem.

Kindly waiting for your reply.




Thanks & Regards
Ram

 

[lantraxco]

I'm not familiar with this machine, and since I have seen machines both ways I will ask, is this an energize to run solenoid, or energize to shutdown? If it's energize to run, the timer keeps the engine running until the electronics have caught up with the fact that the key switch is off. Still needs a signal from the key switch to reset and trip the timer.

 

[Bubbantx]

Hey CUMBRIA6039
Did you get this issue fixed?
Do you remember if the Shutdown Solenoid is energized to Run, or energized to Shutdown?
My manual says it is energized to Run, but Nige stated that he believes it is energize to Shutdown.
And he is a wealth if information, and is usually correct.
What did you find, and how did you correct the issue?

 

[Nige]

Let me ask you a couple of questions seeing as you are asking about a shutdown problem.
Does the engine on your machine start OK but you have a problem stopping it from the ley.?
Have you tested for voltage at the "stop" solenoid wire while the engine is running.?

If the answer to the 1st question is Yes and to the 2nd question is No then I think a voltage test of the wire to the solenoid with the engine running should be your first test. Post back with what you find.

A Serial Number, as always, would help immensely in locating correct information.