Stop guessing and start fixing with the **John Deere 870G, 870GP, 872G, and 872GP Diagnostic Service Manual (TM12144)**. **Texas Manuals** provides the factory logic needed to identify electronic and hydraulic failures on specific serial number ranges.
### **Key Diagnostic Features:**
* **Fault Tracking:** Logic-driven paths to isolate failures in the monitor and blade controllers.
* **Full-Scale Schematics:** Detailed wiring and hydraulic circuit maps for rapid troubleshooting.
* **Hydraulic Pressure Tests:** Official factory benchmarks for the main pump and circle drive circuits.
* **Searchable PDF:** Instantly find fault codes and solution paths via the **Texas Manuals** high-definition digital format.
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