OMA107843

Symptom	Problem	Solution
Pressure gauge near zero when openers are lowered and SCV lever is held forward for a few seconds.	Hose routing between pressure control valve and opener cylinders incorrect.	Route hoses per hydraulic diagram-opener cylinders.

Pressure gauge shows pressure as openers are raised.

Hose routing between pressure control valve and opener cylinders incorrect.

Route hoses per Hydraulic Diagram-Opener Cylinders.

Openers rise when SCV is held forward and lower when SCV is held rearward.

Hydraulic hoses are connected to tractor incorrectly.

Interchange hoses in SCV coupler.

Pressure gauge shows zero when openers are down (Closed center tractor).	SCV lever too far forward. Valve in float position.	Install SCV clip in proper position to hold SCV lever forward, valve open. See USING LEVER LOCK CLIP in Preparing Tractor section.
	SCV lever not far enough forward. Valve in neutral position.	Install SCV clip in proper position to hold SCV lever forward, valve open. See USING LEVER LOCK CLIP in Preparing Tractor section.

Pressure gauge shows zero when openers are down (Open center tractor).	SCV lever in float position.	Put SCV lever in neutral position.
	SCV lever not held forward long enough to charge down pressure system.	When lowering openers, hold SCV lever forward long enough for down pressure system to reach pre-set pressure as shown by pressure gauge.

Openers do not “float” over ondulating ground (Closed center tractor).

SCV lever not in forward position.

Install SCV clip in proper position to hold lever forward. See USING LEVER LOCK CLIP in Preparing Tractor section.

Openers not maintaining proper ground contact (Open center tractor).	SCV lever not held forward long enough to charge down pressure system.	When lowering openers, hold SCV lever forward long enough for down pressure system to reach pre-set pressure as shown by pressure gauge.
	Slow internal hydraulic leakage (normal with all hydraulic systems).	Hold SCV lever forward long enough for down pressure system to reach pre-set pressure as shown by pressure gauge.
	More hydraulic pressure required to compress opener springs.	Increase pre-set hydraulic pressure.

Pre-set pressure does not lower when turning valve knob counterclockwise.	Open center attachment traps oil in system until openers are raised.	Raise and lower openers to pre-set to lower pressure.
	Pressure valve sticks.	Disassemble valve and clean.

Pre-set pressure does not rise when turning valve knob clockwise.	No pressure to adjusting valve.	Hold SCV I in forward position for a few seconds.
	Hose couplers not connected properly to tractor.	Ensure that hose couplers are connected to proper SCV and locked.

No reading on gauge.

Using open center tractor.

Install single point system. See your John Deere dealer.

ZX,OM740A008589-19-20050906