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Pressure gauge near zero when openers are lowered and SCV lever is held forward for a few seconds.
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Hose routing between pressure control valve and opener cylinders incorrect.
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Route hoses per Hydraulic Diagram-Opener Cylinders.
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Openers rise when SCV is held forward and lower when SCV is held rearward.
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Hydraulic hoses are connected to tractor incorrectly.
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Interchange hoses in SCV coupler.
For Tractors With Closed Center Hydraulic Systems
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Pressure gauge shows zero when openers are down.
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SCV lever too far forward. Valve in float position.
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Install SCV clip in proper position to hold SCV lever forward, valve open.
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SCV lever not far enough forward. Valve in neutral position.
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Install SCV clip in proper position to hold SCV lever forward, valve open.
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Openers do not "float" over undulating ground.
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SCV lever not in forward position.
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Install SCV clip in proper position to hold lever forward.
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Plugs in valve block leak.
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Valve block equipped with non-standard plugs and o-ring.
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Replace non-standard 7/16 in. plug with standard 7/16 in. plug and o-ring.
Replace non-standard 5/16 in. plug with standard 5/16 in. plug with no o-ring.
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System fails to build pressure or builds to maximum pressure.
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Contamination in spool valve and/or orifice.
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Remove spool valve from valve body and work spool back and forth with dowel rod while flushing with mineral spirits. Replace spool valve.
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| Symptom |
Problem |
Solution |
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System builds to maximum pressure and cannot be adjusted lower.
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Contamination in V2 ball check assembly.
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Remove V2 port and ball check assembly. Clean ball check assembly thoroughly in mineral spirits and reassemble.
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Openers drift down after being raised.
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Contamination in V1 ball check assembly or piston seal in hydraulic cylinder leaking.
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Remove V1 ball check assembly, clean with mineral spirits and replace. If openers continue to drift down, close transport valve and disconnect hydraulic hoses from tractor. If openers still continue to drift down, replace piston seal in cylinder.
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