Difference between a JD 2850 and 2650?

[britcivic]

Specifically, what makes one 86hp and the other 78? and is the difference really noticable?

 

[chickens and wheat]

We had a 26 because the dealer had one in stock, they came and adjusted it up to 2850 power after a few hundred hours, we couldn't tell the difference really.

 

[DrDunc]

About turning the magic 10mm injector bolt by a flat if memory serves correctly

 

[Sharpy]

2850 usually had assister rams, possibly came standard on bigger wheels with a bigger radiator, 2850 sounded different though, deeper somehow. Both very good tractors though.

 

[Hilly]

I still have my 2450 it’s my favourite it’s a great tractor .

 

[britcivic]

Is it really as simple as that Drdunc?? What a bonus!! Wonder what the difference in dealer price was for the same spec 2850 and 2650?

 

[le bon paysan]

I always thought that the 28 was turboed, and always more than 90 hp. Like a ford 8340 was 125 hp but never found 1 under 135 hp.

 

[DrDunc]

Is it really as simple as that Drdunc?? What a bonus!! Wonder what the difference in dealer price was for the same spec 2850 and 2650?

I really can't remember if they had bigger lift rams, bigger wheels and tyres, etc etc etc

I do know that it is very simple to open the pump on them. There wasn't a 4 cylinder anywhere round here that left the dealer with less than 100hp

They were THE tractor to drive. Quiet, comfortable, and could give the contractors running ih 956's a good run for their money!

 

[chickens and wheat]

Our 2650 had the high lift arms option , assistor rams and hooks instead of ball ends. Fixed sway block meant adjusting a few implements to a wider spacing. I seem to remember lifting a rotorvator and it jamming up tight on the sways,took some lowering

 

[agrimax]

I always thought that the 28 was turboed, and always more than 90 hp. Like a ford 8340 was 125 hp but never found 1 under 135 hp.

Both 26 and 2850 are turbocharged.

 

[britcivic]

I do know that it is very simple to open the pump on them. There wasn't a 4 cylinder anywhere round here that left the dealer with less than 100hp

That might explain why my 2850 (no assistor rams btw) pulls so well - some pretty big hills round here and I hardly ever have to come out of top gear or drop down on the splitter...

I take it they were adjusted on a dyno then?

 

[DrDunc]

That might explain why my 2850 (no assistor rams btw) pulls so well - some pretty big hills round here and I hardly ever have to come out of top gear or drop down on the splitter...

I take it they were adjusted on a dyno then?

Dyno???

Nah

Wound open until the black reak pouring out made you cough, then back a bit for safety

Changed days now!

 

[roscoe erf]

rear lift on a 28 is greater

 

[ccp contracting]

I think 2850 has a heavy clutch , heavy duty 4wd clutch pack .

 

[deere 6600]

Main difference 2650 is great tractor tractor 2850 is a really great tractor

 

[Tractortech]

Now Then..
They are identical tractors in every way other than the MFWD axles. The 2650 had a ZF APL325 and the 2850 had a ZF APL735. The MFWD clutch of the 2850 had an extra plate in too.
They used the same 4 cylinder turbocharged engine, same radiator sizes, same hydraulic pumps and rockshaft cylinders so would have the same lift capacity. Tyre sizes were whatever spec was ordered, both were available as 30/40k, standard or Hi Lift. SG2, low profile SG2, MC1 and CC2 cabs were available on all. There were odd changes through production to the bonnet latching, radiator style and some other minor bobbins..
Horsepower adjustments are best done on a dynamometer, that way you know what you've done. There's internal pump adjustment and the external 'torque' screw for best results.
Customers who had both 26 & 2850s even with the 26 turned up, they didn't pull like a 2850.
So, the tractor of choice would be a late 2850 40k Hi Lift (that's been looked after)!!

 

[7740 man]

Not the model we are talking about but, I was once told the 3650 had slightly thicker castings in the back end compared to the 3350/3050. Sometimes there are more differences than you can see....

 

[biggles]

Not the model we are talking about but, I was once told the 3650 had slightly thicker castings in the back end compared to the 3350/3050. Sometimes there are more differences than you can see....

ive got a 36 and a 33 there’s quite a lot of differences, the assister rams are bigger the hydraulic pump is higher capacity, the engine side plates are ribbed on the back and pick up on another bolt too, the air intake system is bigger diameter, the front axle is a different model, I’m sure there must be more but that’s just what I’ve come accros while working on them, there both 40k but the 36 is slower

 

[biggles]

Flywheel and clutch is also different