John Deere 110 backhoe hardly moving

[jpolcyn]

Hi all. I recently purchased a 110 backhoe with 1700hrs that did not move when I bought it. I've seen on here it is mostly electronic so I bought it. When I got it home and starting looking at the potentiometers they were good. Kept digging and found the porptional valves were only getting a couple volts. So the hst controller feeds it. Bought a new Controller recalibrated it and it moves. Great so I thought. It moves but does not have any torque. Will not move in c range only a range with the throttle half open. Started getting code of ground speed sensor so I replaced it with a new one. Didn't work. Went back through all sensors and found the throttle sensor isn't sending the right volts according to the service manual. So I bought a new one however the new one still wrong volts. The potentiometer is physically rotating the wrong way the throttle linkage moves. Does the throttle sensor really keep the machine from having no torque?? Everything I see it has everything to do with anti stall feature.

I put the out riggers down and raise the back tires put tranny in c range wide open tires spin at road speed. However there is no torque behind it.

I'm starting to get worried it is the tranny. Fluids changed filters changed suction filter clean all hoses hard lines good.

I am going to do the charge pump test to makes​ sure the charge pump is sending 200psi tomorrow.

Anybody have any other ideas? I'm at a lost besides the tranny is bad but boy that to me is hard to believe that going out.

Thanks for the help.

 

[jpolcyn]

Update:

Turns out JD service manual has a misprint for the voltage specifications for the throttle position poteniomter. Local JD dealer says there is a note saying JD screwed up those specifications.

Still doesn't help because the tractor has no torque and un useable the way it is. but at least ruled something else out that we know is not causing the problems.

Any other help would be appreciated.

 

[jpolcyn]

Update:

Charge test pressure was good 200psi.

I took the backhoe off and PTO also will not engage which i figure is part of the tranny problem. But also the 3pt lift arms will not drop. I checked the backhoe switch it functions correctly. I put weight on the arms and they will not drop no matter what. Looks like i have 2 problems on my hands now.

Any help would be appreciated.

Thanks
Josh

 

[City Farmer]

I'm not to familiar with JD tractors but almost all my machines have torque converters. Is there a pto seat safety interlock switch causing the non moving & pto issue?
Did anything look unusual when the oil was changed, draft levers down? More than likely it has an independent PTO. I'd check the pressure on the 3pt, it should be at least 2000psi. Does the loader nose pump run the BH hydraulics? Are there remotes that aren't going back to the loader you can tap in to?
Lots of questions, just trying to get an idea of your machine.

 

[jpolcyn]

There is a interlock on the seat and it is bypassed. Nothing looked unusual i used a magnet around the fluid container when drained but didnt find anything. Pump on front of motor runs loader and backhkoe. both of those attachments work like a charm. It does not have remotes but a power beyond for the hoe and it works as it should.

Thank you

 

[City Farmer]

There is a interlock on the seat and it is bypassed. Nothing looked unusual i used a magnet around the fluid container when drained but didnt find anything. Pump on front of motor runs loader and backhkoe. both of those attachments work like a charm. It does not have remotes but a power beyond for the hoe and it works as it should.

Thank you

That narrows it down a little bit. Do you have 12v going past the jumped out switch to the relay? How about a pressure test on the lift cover. There should be a pressure plug somewhere on it. There's probably another safety switch on the pto you can check for 12v.

 

[jpolcyn]

I have 12v going into the solenoid and out of it. Thats was part of my diagnosis when i was trying to get this thing to move.

I will have to look into the 3point at a later date as 3 point doesnt matter if i cant get the tractor to move!!

 

[disney]

As far as I know the backhoe switch only has to do with raising the 3pt. I am sure you know this, but there are two things will keep the arms up, even if everything is working fine. The rate of drop knob, can basically lock the 3pt from lowering at all, and the more obvious raise/lower lever, if its in a high position, the arms would stay up.

 

[City Farmer]

Copy that. I was looking on the JD website for a parts diagram but it sucks. It's unlikely but I wanted to see if they're using the same pump for the trans and PTO. I did a google TBN search and there seems to be a whole lot of issues with the 110tlb transmissions. Like you said, they all seem to be a sensor issue. Flywheel position

 

[boggen]

3pt hitch lift arms. normally a KNOB between your legs, just under the seat. it adjusts the rate of the lift arms (moving and/or dropping down) lots and lots and lots of questions asked about this same thing to many times i do not want to remember.

 

[boggen]

TLB on some units have a funky setup when you remove backhoe to access 3pt hitch, you need to reconnect the hydrualic hoses up the correct way. hook them up wrong and you get nothing.

============

make sure you are checking correct "fluids"
A) 1 for oil in engine, (dip stick along side of engine normally)
B) 1 for power steering (most likely under the hood near steering pump)
C) 1 for transmission / rear end (between your legs on the floor board, perhaps a circle you need to pop out to access dip stick. if no circle perhaps circle never got cut into the rubber mat on the floor, it might also be loacted in engine compartment just behind the firewall.
D) 1 for pto on rear end
E) 1 for final drive (what goes out to rear tires)
F) 1 for hydrualic fluid to run FEL and backhoe.

with above said
A) normally seperate from everything
B), D), F) might all be tied together under a single pump
C), D), E) might all be tied into transmissions internal pump.

===============
check the emergency break. is it engaged? are any of the cables stuck for emergency brake?

 

[jpolcyn]

I got the 3pt to work. I'd say the 3pt was never used and there was a lot of air in the cylinder so I had to keep working it back and fourth and it finally got freed up. Now if I could only get the thing to move with some power.

I changed controller,ground speed sensor and speed sensor. Still the same. Moves but no power. You can put a empty beer can under the tire and it will not run over it. Stops it right in it's tracks.

Thanks for all the input. Anybody have any ideas on the not moving?

 

[boggen]

looking at John Deere US | Products & Services Information website. and looking at part diagrams

2914 - 110 Tractor Loader Backhoe (Worldwide Edition) - 20Feb17 ( FR DE IT ES SV )

not sure if above is your specific tractor?!??

============
looks to be a clutch that might be out of adjustment / broke.

i see some "PROPORTIONING valves" on the transmission with coil part numbers.

i see a "traction assist pedal" ??? does it lock up rear wheels together so they spin exactly the same?

 

[jpolcyn]

I have checked the proportional solenoid valves. Both seem fine. If you hold down on the difflock yes both tires will rotate at the same speed. But it still has no power behind it.

 

[boggen]

the clutch maybe slipping out of alignment. it might just have enough friction to turn the wheels, but as soon as you apply external force the clutch slips and you go no were.

HST like transmissions might have internal leakage as well or stuck. and when so much pressure builds up. leaks are happening internally not allowing pressure to be sent to the wheels.
HST also should have some sort of "pressure relief valve" internally and may not be set correctly.

have you tried other gear range selections? low, medium, high? (not sure what your tractor has), does tractor also have another gear shifter for say 1-3 or 1-4?
hmmmss try going in reverse and forward in each selection of gear.
check the linkages for the shifters. are they even shifting the transmission into other gears.

on some tractors, there is a shuttle shift leveler by steering wheel that dumps the clutch, then a lever on the gear shifter/s and then possibly another button on the FEL joystick that also dumps the clutch, and other tractors just have a foot pedal clutch with linkages. is the clutch linkages that actually move the clutch set correctly?

it has happened wire harnesses plugs come loose. and mice eating up wire insulation and shorting the wire out.

 

[jpolcyn]

Thanks for the input. I jacked the back tires off the ground with the outriggers and they will spin in all 3 gears just fine. H,M and low is what it has. No clutch or anything like that.

 

[jpolcyn]

Update:

Had to take it to JD as i am at a lost besides the hydrostat going out of it. Should know what they have to say today.

Thanks

 

[buickanddeere]

Any pressure test ports ?

 

[jpolcyn]

Yup. It did not build the pressure like it is supposed to.

 

[jpolcyn]

Hydrostatic transmission is out of it. Get to split it open now. Such fun... Not.