NH 7840 SLDP

[agrimax]

Occasional codes,CP,E47,E37 and no drive. Know what the codes mean,have replaced the clutch potentiometer and checked the distance of the clutch switch, which is where it's meant to be. Have noticed that the shuttle lever is very notchy and the tractor will try to move slightly when pushing it forward or back,with the pedal or shuttle button depressed.It won't actually move off until either is released,provided the codes don't appear. If it had an old style dry clutch,you would say it needed adjusted to clear. Anybody know if a fill time calibration will sort this? Have done the dual power calibration BTW but would need the special switch to go into diagnostic mode for the fill time calibration.

 

[Mur Huwcun]

On an SL is the DP pack not the clutch aswell? I'm sure there's only one clutch pack in them? The SLE will have C1 and C2 packs behing the gearbox

 

[agrimax]

Think you're right although they are C1 and C2 in the DP unit. I have calibrated them much the same as doing a SLE,as per the book but to do a fill time cal' requires going into diagnostic mode and having the 'switch'.

 

[Flat 10]

Wire nipped on the clutch button where you move the shuttle lever?

 

[agrimax]

No,not that. It has since been diagnosed by a man of experience that it needs DP clutch plates.Evidently they're likely warped causing motion as the shuttle lever is being shifted.This premature motion is picked up by a sensor which throws up a code and prevents drive when the clutch or shuttle button is released. Or something to that effect.....

 

[fermerboy]

Yep, your diagnosis is correct. The dual power unit acts as the main clutch as well. If its got a heat up by slipping the clutch or full power up shifts while not properly setup or calibrated the plates warp and don't release the drive properly.
Get it sorted soon, as struggling to get it into gear will knacker the forward/reverse syncro.
The fill times etc will need setting up afterwards but that's not difficult in the computer.
If its an early (white roof) one its worth considering upgrading the piston pack to the later smaller piston version as fitted to the later ones. The clutch control is tons better on them. Possibly too costly nowadays at the age 7840s are now.
The whole unit comes out the front of the box once the tractor is split, syncro is directly behind that so not that bad to fix compared to a SLE.
Mine is getting exactly this fixed next week I hope if I get time. It's done 13000hrs with the last 5000hrs with a loader, so can't really complain. Linkage and loader brackets to the back axle to come off first to split it though

 

[fermerboy]

Here is the inside of my cooked 7840 dual power pack.

And this is what happens to the plates if they get a heat up and warp.

 

[Kevtherev]

The dual power pack isn't silly money to do on parts if I remember right?

 

[fermerboy]

The dual power pack isn't silly money to do on parts if I remember right?

Invoice in today, genuine NH parts from main dealer, all the plates, springs, seals, slip rings, top and front gasket, and both thrust washers(they would have done again really) total £1160+vat.
No labour as I did it myself.

Didn't think it was that bad given that's effectively the high/low and engine clutch all renewed. What would an old style dry clutch itself cost nowadays for a 100hp?

 

[Wiking]

Sounds like a reasonable price especially when you consider that you put 13000 hours on it before needing to replace it! I'm guessing your 7840 has paid for itself many time over

 

[John 1594]

Invoice in today, genuine NH parts from main dealer, all the plates, springs, seals, slip rings, top and front gasket, and both thrust washers(they would have done again really) total £1160+vat.
No labour as I did it myself.

Didn't think it was that bad given that's effectively the high/low and engine clutch all renewed. What would an old style dry clutch itself cost nowadays for a 100hp?

Having just put a 12 inch heavy duty uprated laycock dual clutch in the 15, the total bill for parts, ie new (not reconditioned) pressure plate, new main drive plate, new pto plate, both thrust bearings, flywheel bearing and crank seal....700 quid

 

[Drillman]

Having just put a 12 inch heavy duty uprated laycock dual clutch in the 15, the total bill for parts, ie new (not reconditioned) pressure plate, new main drive plate, new pto plate, both thrust bearings, flywheel bearing and crank seal....700 quid

I would guess on a per clock hour basis the cost isn't vastly different?

 

[John 1594]

I would guess on a per clock hour basis the cost isn't vastly different?

Probably not, im guessing the profuse amount of hedgecutting and subsequent clutch work has shortened its lifespan, although according to a few "in the know" about these old things, i did well to extract 6000 hrs from it

New uprated unit is a definate improvement, much easier on your leg thats for sure

possibly a higher labour cost to split the ford and subsequently extract the DP unit from the front of the box, and then dis-assemble, rather than just split, remove clutch cover and bolt new one on with 6 bolts?

 

[7610 super q]

Invoice in today, genuine NH parts from main dealer, all the plates, springs, seals, slip rings, top and front gasket, and both thrust washers(they would have done again really) total £1160+vat.
No labour as I did it myself.

Didn't think it was that bad given that's effectively the high/low and engine clutch all renewed. What would an old style dry clutch itself cost nowadays for a 100hp?

About £1100 for my 7810 last year. Complete job by NH dealer.

 

[wdah/him]

sorry to bring up an old thread. I'm not a new holland fan but, so far we have had 2 sle tractors, 7740 and the current ts115-i dont like the gearbox bit at the time was told it is a more reliable box than the sldp. the 7740(1997) was grand tractor for yard and loader work and I am now thinking of another tractor for yard work and an other main job. The main job for this tractor would be wrapping round bales and this is the problem with NH sle which i dont know if it is a problem on sldp, when you clutch you loose oil flow, yes its a pain on the loader too but means that the wrapper is actually faster when on an old 399 massey which is what im trying to replace. A 7740 would be prime for this job if the oil flow remain constant when edging onto the next bale.

I have tried my wrapping man with the ts, 7740 and mxm140, he takes the mf399 for this reason, plus it is handier than the last 2 mentioned.

A light clutch is also a big reason for looking at NH

 

[Boohoo]

sorry to bring up an old thread. I'm not a new holland fan but, so far we have had 2 sle tractors, 7740 and the current ts115-i dont like the gearbox bit at the time was told it is a more reliable box than the sldp. the 7740(1997) was grand tractor for yard and loader work and I am now thinking of another tractor for yard work and an other main job. The main job for this tractor would be wrapping round bales and this is the problem with NH sle which i dont know if it is a problem on sldp, when you clutch you loose oil flow, yes its a pain on the loader too but means that the wrapper is actually faster when on an old 399 massey which is what im trying to replace. A 7740 would be prime for this job if the oil flow remain constant when edging onto the next bale.

I have tried my wrapping man with the ts, 7740 and mxm140, he takes the mf399 for this reason, plus it is handier than the last 2 mentioned.

A light clutch is also a big reason for looking at NH

The wrapper will be fine on a dual power, in the days before Fusions I wrapped with a few dual powers including a 7740 and a TS110.
I remember talk of a modification that can be done to an SLE so that the oil flow to the spools stays constant, regardless of clutch position, but I can't remember what's involved.

 

[Drillman]

Few revs seems to cure the oil flow issue When the clutch is used, well It does wen wrapping with our 40 series.

 

[fiatf130]

From memory just press the button on the shuttle and pull to neutral stops drive and doesn't cause a drop in oil flow

 

[wdah/him]

The wrapper will be fine on a dual power, in the days before Fusions I wrapped with a few dual powers including a 7740 and a TS110.
I remember talk of a modification that can be done to an SLE so that the oil flow to the spools stays constant, regardless of clutch position, but I can't remember what's involved.

Have. Need of this but not what it is

 

[wdah/him]

Few revs seems to cure the oil flow issue When the clutch is used, well It does wen wrapping with our 40 series.

Tired that but then lose the bale as we work mostly in hills. Even worse with the tanco wrapper as it allows 7 seconds to lift a bale before it starts the wrapping cycle and for the ts that isn’t enough Hgv when clutch isn’t fully depressed. Think I might change the tanco for a mchale Arhie same as the old one as people are used to it but a shame as tha tanco really is good on hills with the lower table height