Ford /NH 40 series

[agrimax]

Change the bypass valve if there's no oil going through,then the pressure switch if things are no different. Then pressure gauge on the test ports to see whats happening...........

 

[Grouse]

Are you sure the filters were changed - I have heard that one before.....

Before spending any daft money on a parts party attack the cheapest options 1st and never rule out what people say they have or haven't done....

Unless you are doing the job yourself people always skimp including main agents using sh!t oil and charging me for premium oil / but that's another story - and I thought I had a well worn engine burning oil - turns out the main agent used the cheapest shitty oil he had and charged me for premium. Changed it myself and the tratter is perfect.

 

[Humding]

To be fair to the previous owner I would be confident he had the filters changed. A lot of lads I would be thinking twice about alright. The previous tractor we had we bought from a dealer and he was too handy with the soft talk.

 

[Einstien]

Friend of mine has an 8240 and is having terrible problems with the PTO unit. - had the top cover off twice and has had the PTO clutch re-built, seemed to work fine for 6 months - then the PTO would start ok, run for a couple mins then just stop.

He has now been sold a new PTO Solenoid Coil - which I helped him fit today - via an access plate behind the diesel tank. Still no joy - PTO did exactly the same thing!!!

I've pressure tested the low pressure input - as described in the workshop manual, and this seems to be spot on. The 12v supply seems to switch on and off perfectly...

Anyone else had anthing odd, or know where to point us?

 

[Nearly]

There's a short piece of wiring that runs from the loom, through the side of the casting and plugs into the new solenoid that you've just fitted. The wire insulation breaks down just outside the plug and shorts, so stopping the pto.

http://partstore.agriculture.newholland.com/us/parts-search.html#epc::mr49497ar396773

part 55 82013103

The pto needs a good alternator connection as this is how it senses the engine is running (no alternator feed = thinks engine not running = not safe to engage pto)

If you pop out the pto lamp above the switch and engage a (fused) 12v feed to the bulb it should activate the solenoid and pto should work if engine running.

If pto runs 100% then the fault is on alternator / relay / main wiring loom side.
If pto still fails then fault is on wiring between this bulb, through side of casting and to solenoid.

Guess how I know all this

 

[agrimax]

Been there too when I had the 8240. Insulation completely gone from the rubber grommet to the solenoid. Also,the pto control module in the fuse box needed replacing. Big blue relay IIRC.

 

[Einstien]

Ah - should have mentioned that I thought the wiring looked iffy already - so I drilled a hole in the round access plate near the solenoid and fitted a completely separate lead back to the plug that was connected to that bit of wiring.

I'll find a charged battery and make a new 12v supply completely separate from the tractor to power the coil and see if it stays working - the electrics on the tractor do seem very dodge!

 

[Flat 10]

Ah - should have mentioned that I thought the wiring looked iffy already - so I drilled a hole in the round access plate near the solenoid and fitted a completely separate lead back to the plug that was connected to that bit of wiring.

I'll find a charged battery and make a new 12v supply completely separate from the tractor to power the coil and see if it stays working - the electrics on the tractor do seem very dodge!

Alternator output may be dodgy......

 

[Mursal]

Going from above, you'll need above 12volts on the large output terminal at the back of the alternator, to test..
And the charging pin (controls charging light) on the back of the alternator will need to be at battery voltage.

 

[Einstien]

Well to rule out alternator, tried a temp wire loom direct from battery terminals - fuse - switch - solenoid

So nothing to check engine running etc....

He went and tried it on his mower, seemed ok, but then just dropped out again....

I'm baffled, any more ideas?

 

[essexpete]

Well to rule out alternator, tried a temp wire loom direct from battery terminals - fuse - switch - solenoid

So nothing to check engine running etc....

He went and tried it on his mower, seemed ok, but then just dropped out again....

I'm baffled, any more ideas?

Was the PTO switch bi passed with a secondary switch?

 

[Einstien]

Yes - just a simple new rocker switch.....

It seems to be related to load somehow, well the length of time before it cuts out is significantly shorter if driving something that requires a lot of HP....

 

[essexpete]

That does seem odd? So you were by passing the relay as well?

 

[Einstien]

Yep - no relay, wires direct from positive and negative terminal on the battery.

Stood still in my yard, switches on and off fine - appears to be perfect, but when the owner goes and tries it, he says it just jumps out again...??????

I might even have to find a charged battery and stick it in the cab, see if there is some odd short/drop in voltage. BUT I'm starting to think its an oil pressure/flow problem somewhere

 

[essexpete]

Yep - no relay, wires direct from positive and negative terminal on the battery.

Stood still in my yard, switches on and off fine - appears to be perfect, but when the owner goes and tries it, he says it just jumps out again...??????

I might even have to find a charged battery and stick it in the cab, see if there is some odd short/drop in voltage. BUT I'm starting to think its an oil pressure/flow problem somewhere

Worth a try. If it is an oil pressure problem would it not then slip and then kick back in when the load is off? Soon knacker the clutch plates in that situation. I guess pressure testing next?

 

[Humding]

Change the bypass valve if there's no oil going through,then the pressure switch if things are no different. Then pressure gauge on the test ports to see whats happening...........

changed the pressure switch this morning but made no difference. Valve due next week so we'll see if that makes a difference.

 

[Dr Evil]

Currently have an l reg 5640 SL white top 2wd to try from a dealer. Seems in very good nick for her age, what should I be looking out for?

So far, having given it a good run, the hour clock doesn't work (but I know it's a local tractor, from a good home, and it doesn't feel like it's done high hours for its age- clock showing 5k)

I've also found using the button on the shuttle brings up an error- is this a common fault or something to walk away from?

Anything else I should be looking out for?

Bit the bullet and went for this. 2 wheel drive with a decent cab, in very nice condition, with a full set of weights- a cracking little tractor. The tractor spent the first day on the topper, turning on a six pence. She then spent her first night sat on her belly in a wet patch, waiting for a pull out....

 

[Humding]

changed the pressure switch this morning but made no difference. Valve due next week so we'll see if that makes a difference.

Just an update on this. On the recommendation of an ex NH UK service manager that I know he suggested changing the gasket on the transmission control block. Did this the same time as the bypass valve. I knew when I saw the old gasket that it wasn't the problem. Anyhow went at it again one evening and pulled the transmission oil pressure switch again. Took the wire off the solenoid in the injector pump and gave it a few turns on the starter and put back in the old switch. I had noticed something seemed to come out of the switch when I gave it a tap. Anyhow started up and light went out. Went for a drive and it came on again just on returning home. Repeated the procedure and it went out again. All seems to be fine since. It may come on for a few seconds an odd time but this seems to be normal for them. Don't know if the new switch I originally put in is the wrong one or just a duff one.

 

[Happy hillbily]

Bit the bullet and went for this. 2 wheel drive with a decent cab, in very nice condition, with a full set of weights- a cracking little tractor. The tractor spent the first day on the topper, turning on a six pence. She then spent her first night sat on her belly in a wet patch, waiting for a pull out....

No good without pictures

 

[Dr Evil]

No good without pictures

There aren't any- I made sure of that!