JD850-4WD Clutch upgrade?: Tractor Engine Repair Rebuild  -- Tractor Maintenance Discussion Forum and Review JD850-4WD Clutch upgrade?: Tractor Engine Repair Rebuild -- Tractor Maintenance Discussion Forum

  parts   |   manuals   |   discussion   |   photos   |   podcast   |   reviews   |   specs   |   dealers   |   classifieds   |   contact   |   faq   |   myProfile   |   home          Login Now | Sign Up


FAQ:   What is a tractor?

Forum Index
New As Posted | Active Subjects



www.emerichsales.com - New & Used Equipment
          View Tractors For Sale!


www.partsbynet.com - Lawn and Garden Equipment Parts


Bernardsville Landscape Lighting
Click to Post a New Message!

Discussion Boards > Active Subjects > Messages as Posted > Tractor Engine Repair Rebuild Forum

Page [ 1 ] |
Reply | Pop Up Window Reply | Add PhotoAdd Photo
 03-30-2002, 17:10 Post: 36890
Jim Pearson
2002-03-30 17:10:06
Post: 36890
 JD850-4WD, Clutch upgrade?

I have a 1986 model John Deere 850 4WD compact tractor in need of clutch replacement. This model is equipped with a two stage dry clutch with two friction discs. The PTO still engages and works fine but the drive disc slips bad and will not propel the tractor except in low range at very slow speed. I have located a complete replacement clutch including pressure plate and both discs from an aftermarket supplier of O.E.M. parts for around $650.00. Before replacing this clutch with an O.E.M. equivalent, I would like to know if I could upgrade to a bigger or stronger clutch for this model. The original factory clutch just dosen't seem big enough to handle the loads of this 4WD tractor. My repair manual shows the same clutch configuration for the Model 950 as my Model 850. I don,t think the Model 950 clutch is any bigger than my O.E.M. clutch. I would like to know if I could adapt a bigger clutch to my tractor, even if it requires some modification. If anyone has any experience with this, please let me know.






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Stumble This

 03-31-2002, 00:43 Post: 36900
DRankin



View my Photos

View my Photos  Pics
Join Date: Jan 2000
Location: Northern Nevada
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 5105
 JD850-4WD, Clutch upgrade?

My friend at the local Deere dealer tells me that the clutch on this model burns up because folks try to do heavy work like pulling a box blade full of dirt in a gear that is too high. I guess that is one way of saying that the engine is stronger than the clutch. His advise would be to work slower and at higher rpm's when you get that new clutch installed and it should have a normal life span.






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Stumble This

 03-31-2002, 05:50 Post: 36905
TomG

TP Contributor

Join Date: Feb 2002
Location: Upper Ottawa Valley
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 5406
 JD850-4WD, Clutch upgrade?

It seems like curious engineering if the combination of engine torque and tire traction is capable of overcoming clutch disk friction. However, such a design would provide protection for drive train components against load shocks. It might be cheaper to replace a clutch occasionally than to fix broken TX's etc.

It's good to keep in mind that things are usually engineered in a system when considering something like a heavy-duty clutch. Stronger springs in the pressure plate might solve a slippage problem but also might break something. A larger diameter clutch also would do it but usually would require a different flywheel bell-housing etc. and also might break something.

I know the clutch has to be fixed now and that's an aggravation. There's may be no such thing as a heavy-duty clutch that's consistent with the overall engineering. After the fact prevention advise isn't very satisfying, but slower ground speeds and lower gears help. Above all, clutches should not be feathered especially when under heavy loads. Feathering clutches is a good way to create large repair bills.






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Stumble This

 04-18-2002, 22:18 Post: 37614
Jim Pearson



Join Date: Jul 2003
Location: TX
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 3

2
Filter by User
 JD850-4WD, Clutch upgrade?

Is there a website that you can download data from factory repair manuals for a JD 850 tractor? What are other sources to purchase repair manuals other than I & T manuals? I have an I & T manual but it does not show very much detail in some areas. Does anyone publish any good aftermarket repair manuals like Clymer or Chilton does for cars and trucks?






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Stumble This

 04-19-2002, 06:30 Post: 37622
BillBass



Join Date: Feb 2002
Location: North Texas
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 190
 JD850-4WD, Clutch upgrade?

I have a 1984 JD 950 with 2100 hours. The clutch does not slip at all. Under load, either the tires break loose or the engine lugs down, but the clutch never slips.
If you bought the tractor used, it may be that the previous owner had a habit of keeping his foot on the clutch pedal and slipping the clutch when working.






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Stumble This

Reply | Pop Up Window Reply | Add PhotoAdd Photo


Page [ 1 ] |

Discussion Boards > Active Subjects > Messages as Posted > Tractor Engine Repair Rebuild Forum

Thread 36890 Filter by Poster:
BillBass 1 | DRankin 1 | Jim Pearson 2 | TomG 1 |




Most Viewed

+ Diesel engine spits oil from exhaust
+ HOW MANY TRACTOR HOURS IS TOO MANY HOURS?
+ Ford 1910 hydraulic problems
+ Need help with 4x6 Gator 3 Cyl Diesel Engine probl
+ yanmar 3 cyl desiel wont start
+ How to stop Mice Rodents eating Tractor Wiring
+ JD 870 not pulling its own weight
+ Yanmar 186D fuel problem
+ Honda small engines suck!
+ How to Start Honda small engines

Most Discussion

+ Ford 1910 hydraulic problems
+ Mice
+ Small Engine Start Problems
+ High pressure washer problem
+ JD 870 not pulling its own wei
+ Honda small engines suck!
+ Deisel coolant temperature
+ JD870--rops-lights
+ Emergency Shut Down Valves
+ How to Start Honda small engin

Newest Topics

+ Yanmar Fuel pump or primer bulb
+ New Holland TC26DA Ignition Switch Issues
+ New Holland TC26DA Ignition Switch Issues
+ Belarus 800 series
+ New Holland TC55DA 4 wheel drive tractor Boomer se
+ New Holland 3010S wiring problem
+ need rebuild kit
+ Deere 870 tractor with Yanmar ch3048d engine MOD 3
+ JD 4310 - pops out of gear
+ 393 Massey Ferguson dash light













Turbochargers for Tractors and Industrial Machines
Cab Glass for Tractors and Industrial Machines

Alternators for Tractors and Industrial Machines
Radiators for Tractors and Industrial Machines

Driveline Components for Tractors and Industrial Machines
Starter Motors for Tractors and Industrial Machines