hydraulic lift on JD4400: John Deere Review  -- John Deere Tractors Discussion Forum and Review hydraulic lift on JD4400: John Deere Review -- John Deere Tractors 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 > John Deere Review Forum

Page [ 1 ] |
Reply | Pop Up Window Reply | Add PhotoAdd Photo
 06-16-2001, 14:12 Post: 29341
James



Join Date:
Location:
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 1
 hydraulic lift on JD4400

I have a DEERE 4400 hst with FEL and 5' rotary mower. When I lift the mower the lift will pulsate. I mean it will lift all the way up with no problem but will then drop about an inch then lift then drop then lift. Does not matter what the engine rpm is also have no problem with the FEL. the FEL will hold any position I put it in with no pulsation. Fluid level is fine. Great machine anyone else notice this problem.






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




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

 06-16-2001, 17:27 Post: 29343
dsg

TP Contributor

View my Photos

View my Photos  Pics
Join Date: Jun 1999
Location: Franklin, Maine
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 528

2
Filter by User
 hydraulic lift on JD4400

James, the answer is yes. JD has been having problems with the seals in the rockshaft. I have a 4700 and have had the seals replaced (under warranty)at about 400 hrs. and I think I'm going to have to have it done again now with 585 hrs. According to the Service Manager the 3pt hitch is suppose to leak down with a load on it when the engine is off as long as the 3pt valve that controls the speed of the 3pt drop is not closed. But if the valve is closed it should not drop and also it should drop with the valve open and the engine running. David






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




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

 06-17-2001, 06:01 Post: 29350
TomG

TP Contributor

Join Date: Feb 2002
Location: Upper Ottawa Valley
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 5406

3
Filter by User
 hydraulic lift on JD4400

DSG's comments specific to JD. In general, various leaking valve seats and o-rings in a 3ph will cause a hitch to cycle up and down, which probably is why the 3ph cycles and the loader doesn't leak down. It's likely that the 3ph isn't holding oil under load, it leaks down to where the position control goes into lift mode. If the tractor is near to a scheduled hydraulic oil/filter change, you might change oil. Small chance, but it might help. Various small hydraulic oddities disappeared after I changed oil.






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




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

 06-17-2001, 08:57 Post: 29354
dsg

TP Contributor

View my Photos

View my Photos  Pics
Join Date: Jun 1999
Location: Franklin, Maine
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 528

2
Filter by User
 hydraulic lift on JD4400

My misstake, At the end of my reply it should read- (the 3pt SHOULDN'T drop with the valve open and the engine running) sorry. David






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




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

 07-01-2001, 20:20 Post: 29751
DoctorDeere



Join Date:
Location:
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 1

2
Filter by User
 hydraulic lift on JD4400

Check the line fitting where the oil line connects to the lift valve housing. I believe you'll find that the small screen in the fitting has come loose and lodged in the lift valve spool. I've replaced a dozen lift valves for this reason (the screen becoming lodged will score the valve spool, rendering it useless). The symptoms are just as you describe.

The lift valve is located under the range select cover on the left side. Fender removal is required.






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




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

 07-02-2001, 06:40 Post: 29758
TomG

TP Contributor

Join Date: Feb 2002
Location: Upper Ottawa Valley
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 5406

3
Filter by User
 hydraulic lift on JD4400

Dr.: I'm always interested in design issues. I never thought of a screen in the 3ph high-pressure line. At first, I thought 'Why?' After all, the oil runs through a full-flow filter just before the pump. I guess the answer is that the auxiliary system is ahead of the 3ph, and junk could get in the oil through aux system quick-connects of from the lines of any implement with hydraulics. I suppose it's a lesson, especially for those of us who don't have screens, to make sure fittings are clean before connecting them. there may be a lesson for Deere as well. If you have replaced dozens of screens yourself, Iím surprised Deere hasn't come up with a replacement that doesn't come loose. The number of failures world-wide must be huge. Maybe dealers should be bugged, and then dealers might bug their manufacturer reps.






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




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

 07-02-2001, 20:45 Post: 29775
DoctorDeere



Join Date:
Location:
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 1

2
Filter by User
 hydraulic lift on JD4400

Actualy, it's the fitting itself (with screen) as well as the lift valve that must be changed. What happens is this: The screen catches some debris, which causes a partial restriction at the screen. The resulting pressure differential on the upstream and downstream sides of the fitting literaly blows the screen out of the fitting and into the lift valve. Then the operation of the lift valve causes the stainless steel screen to score the lift valve spool.






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




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

 07-03-2001, 05:26 Post: 29780
TomG

TP Contributor

Join Date: Feb 2002
Location: Upper Ottawa Valley
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 5406

3
Filter by User
 hydraulic lift on JD4400

Yes, that's the way I understood your comment. The spool gets damaged. It just seems ironic that a device put in, as I understand, to protect the 3ph from junk accidentally introduced during implement swapping may cause as much damage as the problem it's intended to prevent.






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 > John Deere Review Forum

Thread 29341 Filter by Poster:
DoctorDeere 2 | dsg 2 | James 1 | TomG 3 |




Most Viewed

+ John Deere 2210 Backhoe Review
+ John Deere vs Kubota Compact Tractors
+ John Deere 790 fuel shut-off solenoid failing???
+ John Deere low viscosity HY GARD
+ John Deere JD 4100 Wiring diagram
+ JD 790 or Kubota L3000DT
+ Should I buy a John Deere 4105???
+ John Deere 4300 turns over but won't start
+ John Deere 455 garden tractor
+ Oil Change for Diesel Tractor

Most Discussion

+ John Deere 4300 scuffing......
+ Possible Solution To The 4000
+ Dealer out to lunch
+ Just got my new JD 4410 - Prob
+ Hello Green, Goodbye Orange
+ Receiver hitch for iMatch
+ 4300 wheel bolt problems
+ 4000 Ten Series 50 hour break
+ Don't buy JD compact tractors.
+ Oil Change for Diesel Tractor

Newest Topics

+ Oil overflow from tube and Smoke
+ John Deere 4100 gear 3 point not workin
+ 2000 John Deer Gator 4 X2
+ Mini Excavator SY20C - Small Body with Big Power
+ John Deer 1070 starting problem
+ John Deere 990
+ Tractors R Us
+ john deere 4100 with 410 loader hydraulic problem
+ John Deere 2032R Buying advice
+ John Deere 2010 loss of hydraulics













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