Question about John Deere Synchronizer 340d 440 440a 440b 448dr31028

Open Question

Lost all hyd. function on my 440b log skidder. new pump 2yrs. ago. splines on pump are good. what do i look for next?

Posted by on

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My 2007 648h John Deere skidder makes a loud noise over 2000rpm as though its low on hydraulic oil which it isnt all functions work fine , any ideas


May be sucking air . Check all hoses and clamps between hydraulic tank and pump. Some models had a suction screen in hydraulic tank that when partially plugged will starve pump for oil.

Feb 18, 2017 | John Deere Garden

1 Answer

I changed engine blocks on my log skidder, it has a 5.9 cummins. Used the same injector pump and new injectors, the engine starts and runs idle good but has no power.tried timing it a different way 100...


easy, no year stated nor injection system. (old pump, mpi or direct injected)
my guess is the pump has issues or the fuel feed to it is restricted.
id buy the FSM that matches that engine,and real the injection chapters, and all tests stated there.
any time im at a stall, out comes books, or online versionl

Dec 18, 2014 | Cars & Trucks

1 Answer

2007 gmc c6500 hard brakes, not vacume hyd


if the car has ABS I would look there next.could have a faulty modulator.

Aug 14, 2014 | Cars & Trucks

1 Answer

On 06 john deere 648 GIII skidder i have 3 main codes that pop up F435 F436 and F903 and its very weak and will not start unless using starting fluid i've changed two sensors on the injector pump please...


check fuel and air filters,(water, ice ?) bleed injectors, next I would check glow plugs. oh and try rebooting the computer, un-hook the battery for a few minutes to reset the codes. next you might need to a fuel line pressure test to see if the psi is right. good luck.. jay florida

Feb 03, 2014 | Kitchen Ranges

1 Answer

Taylor fork lift


If your old pump was knackered then I would change your return and suction filters, the insides of the old pump will be choking them. Also check your suction hose (make sure its tight). When the pump was fitted did the engineer readjust the relief valve on the control valve? Is your hyd oil level ok if not top it up it could be drawing air. Your hyd system could also be air locked aswell so it may be a good idea to bleed the system.

Aug 19, 2013 | Heavy Machinery

1 Answer

631 clark skid steer won't drive or steer the left side? the chain is still on the sprockets.


With all the hyd pressure released, need to unhook the 2 big hoses going to the hyd motor on the chain case on the left side and CAP OFF with fittings. Next start the machine and SLOWLEY move the travel control for the left side a little front and back, you should hear a loud growl from the hydrostat, showing that it is pumping under load. Dont do this long, but enough to test. No noise means the problem is in the hydrostat, possiably bad slipper plate, rotating group or both high pressure relief valves.If you have noise the problem is in the hyd motor. Good luck and be carefull!!!

May 09, 2009 | Bruder Cat Skid Steer Loader

1 Answer

Hyd controls get hard after machine has run ten


You got a pressure crossover problem there , main pump pressure is leaking into the servo system I would suspect the pump.

Apr 10, 2009 | Garden

Not finding what you are looking for?
John Deere Synchronizer 340d 440 440a 440b 448dr31028 Logo

Related Topics:

32 people viewed this question

Ask a Question

Usually answered in minutes!

Top John Toys Experts

Vernon Taylor

Level 3 Expert

3176 Answers

Brad Brown

Level 3 Expert

15557 Answers

Adam Fjeld
Adam Fjeld

Level 3 Expert

1508 Answers

Are you a John Toy Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...