| Symptom | Problem | Solution |
Depth control does not function correctly | Implement transport lock-up valve closed | Open valve |
| | Cylinders not ”rephased” (synchronized) | ”Rephase” (synchronize) cylinders IMPORTANT: Be sure all air is bled from depth control system |
| | Machine operating at different depths | Hard ground or adverse operating conditions See implement operator’s manual |
| | Cylinder leakage | Check for leakage Repair or replace cylinders; see your John Deere™ dealer |
| | Insufficient tractor hydraulic pressure | Check tractor hydraulic pressure; use correct size cylinders for tractor pressure |
| | Hydraulic hoses not connected correctly | Reconnect correctly |