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Slow or jerky operation
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Cold hydraulic oil.
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Run engine and cycle loader.
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Use low viscosity hydraulic oil in cold weather. See your tractor operator's manual or your John Deere dealer.
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Low hydraulic oil.
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See tractor operator's manual.
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Selective control valve set slow.
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Increase to fastest rate. See your tractor operator's manual.
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Engine speed too slow.
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Increase engine speed.
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Internal cylinder leakage.
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Test cylinders for internal leaks. Install cylinder repair kit. See your John Deere dealer.
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Faulty tractor hydraulic system. Missing shuttle disk in loader valve on 6000, 6010, 7000 and 7010 series tractor.
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See your tractor operator's manual or your John Deere dealer.
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"Flow checking" or faulty quick-connect coupler.
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Replace coupler. See your John Deere dealer.
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Overloading bucket, grapple or fork.
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Reduce load. See how lift capacity is determined in Specifications section.
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Incorrect control cable adjustment on single lever control operated loader.
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See your John Deere dealer.
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Oil leaks
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Loose connections.
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Tighten fittings.
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External cylinder leakage.
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Install cylinder repair kit. See your John Deere dealer.
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External loader control valve leakage.
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Install repair kit. See your John Deere dealer.
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| Symptom |
Problem |
Solution |
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Lack of lift capacity
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Load is greater than loader lift capacity.
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See how lift capacity is determined in Specifications section.
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Internal lift cylinder leakage.
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Test cylinders for internal leaks. Install cylinder repair kit. See your John Deere dealer.
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Heavily loaded loader lowers when control is moved to raise position.
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Lift check in control valve not working properly.
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Repair control valve. See your John Deere dealer.
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Heavily loaded bucket or implement dumps when control is moved to roll back position.
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Lift check in control valve not working properly.
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Repair control valve. See your John Deere dealer.
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Loader operation does not correspond with control lever movement.
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Hydraulic hoses connected wrong.
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Correct hose connections. See "Identifying Hose Connections" in "Service" section.
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Defective quick-connect coupler.
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Replace coupler. See your John Deere dealer.
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Loader settles from raised position.
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Internal leak in control valve or cylinder.
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Test for leaks. Install repair kit. See your John Deere dealer.
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