John Deere 1040 problem

[Coop]

Hi i hope someone might have an idear what’s wrong?
I have a John Deere 1040 and the warning light and hydraulic light are flashing on tickover, they go out when you increase the revs. If you leve it on tick over and keep turning the steering (power assisted) or keep operating the 3pt linkage then you loose all The hydraulics then it comes back when you rev it for a bit.
I have changed the hydraulic filter and cleaned the mesh filter and fresh oil, no change to the problem so stripped the hydraulic pump and replaced the seals and still not fixed, has anybody else got any ideas as I’m at a loss now. Thank you

 

[davidroberts30]

Knock the hand throttle forward enough to cure it?

If it's anything like the bigger ones then theres a charge pump in the rear axle which may be weak but also sounds like a internal leak

 

[Phil P]

Hi i hope someone might have an idear what’s wrong?
I have a John Deere 1040 and the ⚠ warning light and hydraulic light are flashing on tickover, they go out when you increase the revs. If you leve it on tick over and keep turning the steering (power assisted) or keep operating the 3pt linkage then you loose all The hydraulics then it comes back when you rev it for a bit.
I have changed the hydraulic filter and cleaned the mesh filter and fresh oil, no change to the problem so stripped the hydraulic pump and replaced the seals and still not fixed, has anybody else got any ideas as I’m at a loss now. Thank you

As @davidroberts30 says sounds like either your charge pump is knackered or there’s something leaking. If the transmission pressure light is coming on it will be something before the transmission pressure relief valve on the top cover.
long time since I’ve seen a 1040, does it have hi/lo splitter, mfwd? Could also be pto brake leaking.
Chances are though the pump is tired which means cab off and splitting.

 

[Tractortech]

Now Then..
As said, does it have Hi-Lo?? Is it a 'Synchronised' transmission or a 'collar shift'
If you only need a few revs to put the light out, hopefully it's only a small leak.
The pipe from the charge pump to the filter used to shatter on those and modified pipes were fitted. However, there can be issues with some of modified ones... The Hi-Lo can leak when in high and occasionally the gasket on the shift cover can fail. Other than that, crackin' little tractor..

 

[Coop]

I may sound thick but how do I know if it is collar or synchronised transmission and if it has hi-lo. It 2 wheel drive. Thanks for answering

 

[solo]

Hi lo is the half gear splitter which doesn’t need the clutch . On a 40 series you pushed the gear lever away towards the window for hi and pulled it towards you for lo. Tallis Amos at Leominster would sort you out if you’re not sure.

 

[Ioan annwyl]

I think the ball bearing has come out of the tow cup above the pinion in the rear axle. By increasing the revs you compensate for the leak. Does Pto or hi-low drop out at low revs?

 

[Tractortech]

Hi-Lo on a 1040 would be a lever with a red end underneath the steering wheel on the opposite side to the hand throttle. Does it have black dash panels and batteries under the step (OPU cab). Or green dash panels with the batteries inside (LP cab).
OPU tractors were all Synchro, the LP tractors were all or mostly collar shift.

 

[solo]

Hi-Lo on a 1040 would be a lever with a red end underneath the steering wheel on the opposite side to the hand throttle. Does it have black dash panels and batteries under the step (OPU cab). Or green dash panels with the batteries inside (LP cab).
OPU tractors were all Synchro, the LP tractors were all or mostly collar shift.

That hi lo lever was the same as our 2130. I’d forgotten that The 2140 had it on the gear lever.

 

[Coop]

It has hi- lo lever (Hare/tortoise) left had side of steering wheel, it has black dash and battery under step so it must be an opu can.
Had a look yester day and with a pressure gage in the spool valve it has good pressure on tickover when you turn the steering to the right the pressure drops a little but returns to normal but if you turn to the left the pressure drops to nothing and you loose all hydraulics, steering jams up the rear lift arms stop working. If you increase the revs after say a minute everything comes back to normal.

 

[Tractortech]

Ahhhhhhh.....
You could disconnect the steering supply and blank the Tee with a 9/16 JIC fitting, then see how your pressure looks at the trailer connector.. More than likely you need seals in the steering column... It's a fiddly job...

 

[Ioan annwyl]

Do you have more steering lock one way or another?

 

[Coop]

That’s a good idear I will get a blank t fitting today and try that.
I would say there is more Steering lock to the right Than the left.
Thank you everyone for your reply’s and Suggestions it’s very much appreciated.

 

[Tractortech]

If the steering has more turns one way than the other, the piston may have unscrewed itself. I think you'll need the steering column off, 6 valve O rings and some seals for the piston end and that will fix it..

 

[thesilentone]

They are a bit complex, but the problem should be easily sorted.

As has been said, a chance an internal pipe-work leak,

Check the transmission pump pressure (if my memory serves me right about 130-150 psi) JD men correct me if I'm wrong.

Check the main pump pressure (about 2250-2500 psi)

Do a flow check by tapping a flow meter into one of the scv valves (quick coupler) a consistent 7-10 gpm without cavitation.

Don't be frightened to overfill the back-end oil a bit.

 

[Ioan annwyl]

Sounds like piston has unwound itself as Tractorteck has mentioned.?

 

[Coop]

Hi so an update. Disconnected the power steering and caped the T. Still have the problem, so with a pressure Gage fitted to the spool valve with tractor on tickover we had 2500 to 2700 psi then after lifting the rear arms 2 /3 times the pressure dropped to
500psi and the arms started to judder.
any ideas? Thank you very much for you help so far

 

[thesilentone]

Service (transmission) pump.

 

[thesilentone]

Years ago I had a problem with a quil shaft end not pressed in correctly. It moved when under pressure. You will need to spilt her I’m afraid.

 

[Phil P]

If your getting a warning light your transmission system pressure is low, which means you’ve got an internal leak somewhere before the oil gets to the front pump.

The transmission pressure is regulated in the top cover to 25bar the excess oil then becomes lube oil at around 3-6 bar to supply lube and oil to the front hydraulic pump.

if the warning light is coming on you’ve not got enough oil to make the 25bar so you can forget about the main hydraulics until you sort your leak on your system 1 circuit. A lube pressure test may help narrow the fault but if the light is on all the time a tick over either the transmission pump is goosed or the pipe is split to the top cover.

Best thing to do is bite the bullet and get it split, new pump and re seal everything while your in there.

Job sorted ?