Takeuchi TL140 Electrical fault has killed all work functions

Chief Jim · Jan 1, 2014

I bought the shop manual and I cannot seem to get the electrical fault located.

The machine worked perfect , then slowly started to show a shorter time for the Auxiliary hydraulic circuit to work. Finally, I went out to do some mowing and everything hydraulic quit. Engine, starter, fuel pump, horn & lights all work. Travel motors, arm & bucket and aux hydraulics died. No power to either the green or amber hyd switches.

Ideas? Anyone have a more detailed electrical troubleshooting chart than is in the shop manual?

Thanks,
Jim

cartzblown94z · Jan 1, 2014

Look for the bypass plug in. On my 130 it's on the harness on the bottom of the back door. Should be taped up connector. Plug it in n the machine should work. There's one blue n one yellow. One bypasses the machine safety interlocks, one bypasses the engine interlocks

Chief Jim · Jan 1, 2014

cartzblown94z said:
Look for the bypass plug in. On my 130 it's on the harness on the bottom of the back door. Should be taped up connector. Plug it in n the machine should work. There's one blue n one yellow. One bypasses the machine safety interlocks, one bypasses the engine interlocks

I don't have any wires on the back door.??? It that labeled on the wiring schematic??? THANK YOU. I seem to recall someone, someplace mentioned a bypass.

cartzblown94z · Jan 1, 2014

Ok I haven't worked on a 140. My 130 has a fuel filter and small fuel pump on the bottom of the back door and that's where the bypass plug ins are

Chief Jim · Jan 1, 2014

OK. SO, they are actually ON the door? That sounds like a good place for them. Thanks again.

cartzblown94z · Jan 1, 2014

Yeah I have a small harness that runs to the lil fuel pump on my back door and that's where they are. Easy to get to when the door is open but you'd never know they were there without looking in detail

cartzblown94z · Jan 1, 2014

Also have you ruled out the seat bar switch? I left my machine bypassed but my seat bar still controls on and off for aux hyd stuff

Chief Jim · Jan 1, 2014

cartzblown94z said:
Also have you ruled out the seat bar switch? I left my machine bypassed but my seat bar still controls on and off for aux hyd stuff

I got it running through dumb luck. I looked all over, found a couple odd looking wiring thingys over the engine. One was a yellow plastic two prong wiggit with a return arrow symbol. I cleaned that, jiggles everything in touch. There is a jumper wire going to a solenoid under the left pilot handle. So, prior owner had trouble with the circuit feeding that lil solenoid on top of the valve block, I guess. Anyway, the beast is back under cover. Thanks man!

cartzblown94z · Jan 1, 2014

Awesome. Good deal. The bypass connectors are one yellow and one blue. They would normally be unplugged and taped to the harness if no one had hooked them up

Chief Jim · Jan 1, 2014

Takeuchi Track Loader Lever Lock & Emergency Release Connectors

cartzblown94z said:
Awesome. Good deal. The bypass connectors are one yellow and one blue. They would normally be unplugged and taped to the harness if no one had hooked them up

HA! You told me the thing would be Yellow. I thought you meant it would be a YELLOW WIRE. So, now I have to keep looking until I find a BLUE chunk o plastic like the Yellow one? Man, I have read a bunch of conversations about the Taks having various electrical problems and you are the very first man to even mention these two objects. https://www.heavyequipmentforums.com/images/smilies/notworthy.gif And there is no mention about them in the crappy, ill marked Workshop Manual. The electrical print does indeed show : on page ( Rev.2 III-45 T9C825) LEVER LOCK RELEASE CONNECTOR and up with the engine sensors stuff, EMERGENCY RELEASE CONNECTOR. However, at no other place , even the Troubleshooting Sections, are those two CONNECTORS mentioned. I will be having a conversation with Joe at the factory soon. What drives me snaky is the lack of proper identification of the components on both the electrical AN hydraulic circuit prints. You would think one or the other would allow a positive location and function description so you could cross reference over to the other circuit. The Son's Of Nippon kept the index pages to themselves on translation.

phil_w · Jan 2, 2014

Jim

It sounds like you are describing the "lever lock solenoid". It is fed power from the switch on the safety bar .
Maybe the previous owner has run a jumper wire to the solenoid because the proximity switch on the safety bar is faulty.
Do your hydraulics work with the safety bar up?.

Regards...........Phil

edrrt · Jan 2, 2014

The eletrical runs in a plastic conduit. To bypass sensors you need to connect two wires. They stick out of the black conduit and are typicaly taped back to it in opposite directions with yellow eletrical tape. They will be completely hidden under the tape so look for the yellow tape around the plastic conduit.

I can attest that Tak's one weak point is the eletrical. I think their reasoning is that they cater to the rental market so it's kill sensor heavy and conservative to protect it from idiot rental customers running with low collant, etc. Better safe than sorry approach. But what a headache when they age.

rvmike · Feb 11, 2017

I know this is an old post, but I found the location of the bypass connector on a 140,, just above the battery in a big cable on the lower rear right side..

skata · Mar 20, 2018

rvmike said:
I know this is an old post, but I found the location of the bypass connector on a 140,, just above the battery in a big cable on the lower rear right side..

is there something there you just plug together? sometimes my machine wont move at startup.
i think that relay by the floor board is going out on my machine. anyone know a part# for it?

WillardNelson · May 14, 2018

Just got my troublesome TL140 back from an injection pump shop and now my safety bar in the up position will NOT kill the hydraulics. I haven't looked yet but tomorrow I will see if somehow they plugged the bypass wires together and bypassed the safety switch. Shop claimed they never messed with any of the electrical circuts.
-Kevin

WillardNelson · May 15, 2018

Here is the safety bar bypass plug on a 2007 TL140. My starter ended up junking out and diagnosing it the shop thought this should be plugged in. It's unplugged now and taped back with yellow tape.

Junkman21 · Aug 18, 2018

thanks to this thread my TL140 is up and running!!

RVM · Mar 3, 2020

Yes, this is an old post, but we should post to it to keep it relevant. I added a pair of wires up to the console from the bypass plugs so I could install a switch. This lets me set the brakes and kill the hydraulics when I'm on a hillside. I never have figured out what the original problem was, but it works.

63 caveman · Mar 31, 2020

Help Please,
I have the same flashing lights and auto shut down (15-20 seconds) found the bypass wires and plugged them together, still shutting down?

Would like to know were the "safety relay is location is. Is it one of the two under the back off cab?

skata · Mar 31, 2020

63 caveman said:
Help Please,
I have the same flashing lights and auto shut down (15-20 seconds) found the bypass wires and plugged them together, still shutting down?

Would like to know were the "safety relay is location is. Is it one of the two under the back off cab?

The relays are behind the panel in front of your feet. But the safety relay just stops hydraulics from working. Engine stays running. Your engine shuts off? May be a coolant temp sensor on upper coolant hose to radiator.
And most obvious, did you check oil and coolant levels?

Takeuchi TL140 Electrical fault has killed all work functions

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