Chipper Anyone use a PTO chipper?

[greg_g]

I didn't know iof my old 4400 had a PTO brake either, so I looked in the Service Manual...So, my 4400 does and I expect your 3720 does too (as does BethesdaEC's 2520)....

Bit of a difference between generations Roy. Your 4400 had a wet disc PTO clutch. Our new 2x20 and 3x20 series have electric PTO clutches.

//greg//

 

[RoyJackson]

Bit of a difference between generations Roy. Your 4400 had a wet disc PTO clutch. Our new 2x20 and 3x20 series have electric PTO clutches.

//greg//

True...however, I wouldn't be surprised if those newer machines do have a PTO brake. Do you have the Deere service manual? There is still a lot of commonality between the older 4x00/4x10 series tractors and the newer 3x20 series machines. The 4x20 series is, of course, a different animal being all Deere built.

(not refering to your post) Looks like this is another thread that folks are going to have to agree to disagree about engaging and disengaging a PTO.

 

[grsthegreat]

I think we would agree to disagree about the color of an orange on this site HEHE:laughing: :laughing:

 

[greg_g]

TThe 4x20 series is, of course, a different animal being all Deere built.

All Deere, yes. But different animal, no. The 4x20 series is still classed by JD as a compact utility, and still uses an electric PTO clutch. Sized for the additional horsepower yes, but electric nonetheless.

//greg//

 

[RoyJackson]

All Deere, yes. But different animal, no. The 4x20 series is still classed by JD as a compact utility, and still uses an electric PTO clutch. Sized for the additional horsepower yes, but electric nonetheless.

//greg//

What I meant is, you'd find a number of components from the old 4xxx series tractors on the new 3x20 series (fenders, axles and very likely other components). I tested a 3320 a few years back and recognized several items when I did my walk around and try out.
The 4x20 series doesn't appear to share many of those components.

 

[RoyJackson]

I think we would agree to disagree about the color of an orange on this site HEHE:laughing: :laughing:

You got that right, Bro!!!

 

[greg_g]

I tested a 3320 a few years back and recognized several items when I did my walk around and try out.
The 4x20 series doesn't appear to share many of those components.

You recalcitrance is mystifying, you're clearly responding by rote rather than note. If you even bothered to glance at the Deere website you'd never have posted any of that. And I can speak from hands-on experience. Because I inspected the entire line in detail before settling on the 3720. Why you're even bringing the old 4000 line into the discussion is beyond me. They've been out of manufacture for over 10 years.

So one last time. The 2x20/3x20/4x20 series John Deere are just three different sizes in their compact utility offering. The basic difference is basically size and power; Yanmar engines in the 2x20/3x20 lines, JD engine in the 4x20 line. Plus the 4x20 line offers draft control. Other than that, they're pretty much different sizes of the same thing.

//greg//

 

[RoyJackson]

You recalcitrance is mystifying, you're clearly responding by rote rather than note. If you even bothered to glance at the Deere website you'd never have posted any of that. And I can speak from hands-on experience. Because I inspected the entire line in detail before settling on the 3720. Why you're even bringing the old 4000 line into the discussion is beyond me. They've been out of manufacture for over 10 years.

So one last time. The 2x20/3x20/4x20 series John Deere are just three different sizes in their compact utility offering. The basic difference is basically size and power; Yanmar engines in the 2x20/3x20 lines, JD engine in the 4x20 line. Plus the 4x20 line offers draft control. Other than that, they're pretty much different sizes of the same thing.

//greg//

Deere doesn't reinvent the wheel when going to new models. There has been a fair amount of utilizing components from the previous models when new ones are introduced. The 3x20 series is no exception...if you can find a 4xxx series machine, go set on it...give it a good look over. You'll see what I mean.
An even better example is the 4005 and 3005. Those machines share components that go back two generations (4005 to the 970; 3005 to the 770).

Since you wrote that the new tractors have an electric PTO...are you sure it's not electrically actuated-mechanically operated? Meaning there's a electric servo to engage and disengage the PTO, but it's actually turned by mechanical means. And, with all that hydraulic fluid in the reservoir, a hydraulic brake makes sense.
IIRC, the 4x10 series machines (the follow up to the 4x00 tractors) also used an electric actuation (switch) for PTO engagement.
If you have the Service Manual (or if any othe TBNer has access to one), you can look in the PTO section for theory of operation. If you don't have a Service Manual, give your dealer's service department a call.
Until that time, I stand by my post...

I don't know the newer Deeres that well, but I do know manufacturing...frequently, model changes are more cosmetic then fundamental changes in the mechanical/electrical end of things (very common in the automotive/transportation industries). Deere is a pretty conservative company and they're not likely to be that innovative. Also, the costs for new tooling is astronomical which lends itself to using tooling from previous generation models.

 

[greg_g]

I don't know the newer Deeres that well

I rest my case.

//greg//

 

[RoyJackson]

I rest my case.

//greg//

Call your dealer...you might find out you don't know them as well as you think you do...

Anyway, since I don't have a service manual for the 3x20 series machines (for theory of operation), I did the next best thing...went to JDParts and compared the PTO systems between the 4400 (although the 4410 might have been a better comparison) and the 3720.
These are both illustrations for the PTO system...not all inclusive, but shows the components.

The 4400 uses a clutch and brake (items 25 and 11, respectively), the 3720 uses a clutch that appears to combine the brake and clutch in one assembly (due to it's greater number of friction disks). I did look at the 4410 (HST) which as a very similar arrangement (didn't save the illustration though).
So, it appears the 3720 does use a PTO brake (although the terminology is clutch).
That's my interpretation of the illustrations.
However, the illustrations don't describe the operation...greg apparently doesn't have the service manual either, so I guess he doesn't know either.
If anyone does have a 3x20 series service manual, how about posting the section on the PTO operation (not how to use it...that's in the operator's manual). It will most likely be in the power train section or under miscellaneous.
Bottomline is, the 3x20 series appear to have a PTO brake, but unlike the 4400, it's not a dedicated assembly.

ADDED: Although I was surprised to find it on the Deere website, there it was:
JohnDeere 3720 Compact Utility Tractor 3000 Series Compact Tractors JohnDeere.com
under the specifications tab.
I also added a screen shot...note the yellow high lighted section. The 3720 does have a PTO brake (and I think I was correct...the brake and clutch are one package now, rather then two discrete assemblies

My JD2520 has a brake, next time I am running the chipper I will pay more attention to how quickly it stops, but I would guess within a revolution or two.

Well, yes...your 2520 does have a PTO Brake:
http://www.deere.com/wps/dcom/en_US...drive_tractor/2520_4_Wheel_Drive_Tractor.page
Look under the specs tab.