7710 dual power problems


Why not just repair the dual power? Biggest reason at this point is cost. While the needed parts are available, some OEM, some used, some aftermarket, it all adds up to a tidy sum. Yes the dual power feature is handy at times, but it's not mandatory for this particular farming operation. This move is only one of the options being explored.
I was hoping to hear from someone who's been there (or attempted to be there) and can provide some details on what might be involved/encountered.
 
Wait till you price out the parts to convert over - see link below. The major parts you'll need (at least) are part numbers 2, 4, 14, & 62. If you had to buy all of that stuff new, it would be cost prohibitive, assuming they were even still available (doubtful). Finding that stuff used will be tough because not many 7710s came from the factory less Dual Power.

I agree with the others - you'd be ahead to repair the Dual Power.

Note: The link below assumes you have the non-syncro trans. Go the appropriate section of the parts book for syncro trans.
Conversion Parts
 
At first glance it appears that items 2, 14, and 62 are still available new at a total price of under $1000. That's less than just ONE of the parts we're currently needing to repair the dual power.
As for item 4, I'm wondering what would be the major difference there other than an internal snap ring groove at the very front to retain the input shaft (item 2)?
 
I don't know what the difference is in item 4. I'd bet that shaft alone is over a grand.

That said, good used Dual Power parts should be easy to find, for less than what you'll need to convert, IMHO. Not only that,
you'll have a tractor that's worth more when you go to sell it. Not having DP would be a deal killer for me, it's that
valuable.
 
I remembered seeing it on here awhile ago hope it helps.

Redneck dual power delete is the name of the post:

https://forums.yesterdaystractors.com/viewtopic.php?t=1305568&highlight=
 
I admit resale value wasn't mentioned during conversations on the cost of repairs. I guess I can take that up with the owners.
As for availability of used parts -- yes that's on the option list as well. I've contacted some salvage yards and found a direct drive clutch housing and the associated input shaft for $1000. Nothing yet on the outer main housing but a single estimate of "probably $500 +" to bore and sleeve it. We're still looking.
 

I put a dual power into a 9000 from which it had been removed some years earlier. I wish I could remember what happened to the parts.
 

You can save some money on DP parts by looking around. Madison Tractor has some parts. the under drive clutch disc D2NN7R000A is $77.49 while at CNH it is $101.48.
 
Now that's interesting. I can't help wondering why that doesn't show up on the 7710 parts list. I will certainly explore that option. I was just about to start searching again for a used housing. I believe I will contact my machinist friend with this information and see how that works out.

Thank you for bringing that to my attention. I've spent so much time studying the transmission parts lists for the various models looking for those that may have parts we can use and never noticed that.
 
(quoted from post at 06:46:21 11/02/18) Now that's interesting. I can't help wondering why that doesn't show up on the 7710 parts list. I will certainly explore that option. I was just about to start searching again for a used housing. I believe I will contact my machinist friend with this information and see how that works out.

Thank you for bringing that to my attention. I've spent so much time studying the transmission parts lists for the various models looking for those that may have parts we can use and never noticed that.

When I was looking for mine, I finally found one nearby that had sat for 35 years after a fire when nearly new. All of the major parts were good, and I got new bearings and seals for it. Most of them came from the local bearing store at 1/3 CNH price.
 
The reason the sleeve shows in the 7000 parts catalog but not in the 7710 parts list is because the 7000 came with the wear
sleeve from factory, whereas the 7710 did not. All your machinist friend needs to do is bore out the housing so that the wear
sleeve will be a press fit in the bore. Bingo, it's fixed!
 
That makes sense. It looks like Ford engineering sort of "cheapened" the part at some point in there, possibly when the housing was redesigned to accept the solenoid type valve.
Thanks again for pointing it out, as I doubt I would ever have learned that had you not mentioned it.
 
They removed the wear sleeve, no doubt for cost reasons, but also because they changed over from the metal sealing rings used in the original 1970 design to the plastic seal type roughly a decade later. I'm sure it has nothing to do with the style of control valve.
 
There is also the PTO shaft seal that goes in there that is NOT shown in the parts listing today, unless it's been corrected recently. One has to go back to the books to find that...

Rod
 
It can be done but would be close to as costly as repairing what you have. Several years ago I had to replace the main housing in
one for a customer. Bought a complete used unit for 1500 and resealed it... so he was probably into it for close to 2k... but it's
worked fine for him ever since. I'd also reiterate other comments of the value of Dual Power to the usefulness of the tractor. I
have a 5000 with a straight 8 speed and I'd love to add DP to it... it's just THAT valuable. I actually use my 7710 for some jobs
over the 5000 because it has DP.

Rod
 
Not sure what seal you're thinking of. I see an o ring on the hollow shaft flange where it plugs into the transmission shaft/gear, and a seal on the rear of the planetary ring gear that rides on pto shaft. What else is there?
 

My 6610 had dual power and I use it a lot, I've been some what in the market for a 7710 or 7740, I've looked at a few but if they don't have dual power I walk away.
 
Shuttle shift is typically meant for no-clash forward-reverse shifts. Dual Power is simply a two-speed powershift that adds an extra underdrive ratio to every mechanical gear range in the main gearbox. Dual Power can always be shifted under load, whereas on a shuttle shift that capability would depend on the type of design it uses (syncroed vs wet disc clutch pack).
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top