Looking for information on a john deere 3380tractor hydraulics

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).

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jimmy nutron

• 132 Answers
• Posted on Jun 04, 2009

SOURCE: I have a 1968?? 2020 john deere. The hydraulic

make shure none of your hydrolic cylenders are extended and fill it up till you can stick you finger in there and it barley touches if you do this when cylenders are extended you will over fill it.

SOURCE: John Deere Three Bottom Rollover Plow

Hey, the "round cylinder" is a power steering motor for a John Deere 630. If you start looking for one of those instead, I'll bet you'll have better luck. Deere dealerships tend to not care unless you're buying a half million dollars in equipment.

Bill Linda Rivard

• 197 Answers
• Posted on Nov 15, 2009

SOURCE: our john deere sabre 17.542 hs ride on mower will

If traction drive belt is turning you should check the input drive shaft on top of trans to see if it is turning as well,Traction drive belt is suspect but could be a stripped out input shaft pulley.Make sure the machine tow lever is not pulled out,rear of machine by tow hitch.Also pull rubber caps off of both axle ends to see if one the axles is turning free inside of rim,if so remove wheel and replace axle key.

SOURCE: How do I replace a hydraulic pump on a John deere

The pump is located in front of the engine.A coupler joins it to the front crank shaft pulley.