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Will a plugged hydraulic filter make a whining noise on a John Deere 9420?

There isa whining noise coming from under the cab on John deere 9420 tractor .J.D. Technician thought it was coming from one of the three hydraulic pumps under the cab. Oil level is OK.

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

blueextc3221
  • 15935 Answers

SOURCE: system creeps down even when tractor is operating.

There are 2 potential problems -
1. Leaking spool on the control valve - rebuild the vale.

2. Cylinder blow-by. Disassemble piston and replace the seals.

To test if its the cylinder - retract the cylinders all the way... remove the hoses on the blind end (non rod end) of each cylinder, and again pull the valve to the retract position.

If fluid continues to pour out of the cylinder - the piston seal is damaged, and the affected cylinder must be repaired.

To test if the valve spool is faulty - disconnect the a and b ports just after the valve. Turn on the system and check for seepage from the disconnected lines (without moving the lever).

Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

Posted on Apr 19, 2009

  • 548 Answers

SOURCE: can't get front wheel off my john deere lawn tractor

remove the cap on wheel then there is a ring or cotter pin to remove then pull wheel off

Posted on Aug 22, 2009

rwvanlue
  • 486 Answers

SOURCE: John Deere Gx75, kawasaki 9hp motor- oil in carb!

A very common problem with the GX series with Kawasaki engines. The carburetor 'inlet needle' sticks open and fills the crankcase with fuel. When checking the oil, it can be difficult to see the gasoline and the level appears to be OK. Remove the dipstick and smell the oil, you may detect a gasoline smell. Also, drain the oil, and you may find much more fluid than you expect.
The solution on newer mowers was to install an 'in-line' shut-off valve to keep the fuel from syphoning into the carburetor. The inlet needle and seat in the carburetor is NOT replaceable, so a new carburetor is the ultimate solution, but VERY expensive. Installing and using an in-line shut-off valve is more affordable.
Also, this situation is common when machine is transported on a trailer, as the bouncing causes the needle/seat to leak. When transporting, always turn off the fuel supply to the carburetor.

Posted on Nov 08, 2009

nova2nv
  • 197 Answers

SOURCE: John Deere Lawn Tractor LX176. Battery discharge

Locate voltage regulator above battery to the left as you sit on machine,its behind frame that supports steering wheel.Once you have found it use a light to shine on harness and follow the brown wire that leads into regulator.The plastic around that wire should not be burnt or showing any other color.The LX series machines had a problem with brown wire coming loose and causing the charging light to stay on.Remove plug from reg and use small screwdriver to clean out wire and work it a little so it makes good contact.

Posted on Nov 13, 2009

  • 1 Answer

SOURCE: JD 4020 Row Crop Tractor; No power Steering, No

In regard to the problem - JD 4020 Row Crop Tractor; No power Steering
What was the problem and how did you fix it I'm having a simlar problem

Posted on Oct 09, 2011

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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


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Hi Joe:
Nice looking tractor. I'm guessing you may have a leak in one of the hydraulic lines. There's usually access panels that you can remove so that you can see the lines and fittings. Sometimes a mirror on a handle and a flashlight will help you locate the problem. Once you find it, replacing the hose is usually easy and your local hydraulic shop will fabricate the needed part at a reasonable price.
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accord to my books this tractor has a wet clutch transmission (12 speed) , first thing is to ck your fluid level in transmission , this is bit hard to reach on this one but is possible second obtain a small sample of fluid from transmission, have it tested , It can tell you alot , second you mention that hydraulic pump overloads engine with simple tasks like raise 3-point, this could be a stuck pressure relief valve due to yep you guessed it dirty filter (it bypassed itself) ck hyd fluid for proper level and clarity ohh and one more thing this tractor uses hyd pump for power steering (some others have 2nd pump for this) is it possible that noise is coming from that area , cus I have had to replace power steering valve on that model once for a loud Noise reason
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