If the third digit of the diagnostic trouble code number is (T), it indicates a problem with B4 Transmission Speed In Grip (SIG). If the third digit of the diagnostic trouble code number is (R), it indicates a problem with B27 Reverse Speed Ratio switch. If the third digit of the diagnostic trouble code number is (L), it indicates a problem with Y4 (LH) Motor Shift Solenoid. If the third digit of the diagnostic trouble code number is (K), it indicates a problem with Y3 (RH) Motor Shift Solenoid. Wrong transmission controller, or when a new transmission controller has been installed and not calibrated. If the third digit of the diagnostic trouble code number is (J), it indicates the F3J4 diagnostic trouble code was displayed when exiting calibration with out completion. If the third digit of the diagnostic trouble code number is (H), it indicates a problem with S3 Neutral Start Switch. If the third digit of the diagnostic trouble code number is (P), it indicates a problem with S20 Park Lock Lever Switch and/or S4 Brake Pedal Switch. If the third digit of the diagnostic trouble code number is (C or D), it indicates a problem with B9 Front (RH) Pump Pressure Control Pilot (PCP). If the third digit of the diagnostic trouble code number is (A or E), it indicates a problem with B8 Rear (LH) Pump Pressure Control Pilot (PCP). If the third digit of the diagnostic trouble code number is (9), it indicates a problem with B6 Hydrostatic Pump Speed Sensor. If the third digit of the diagnostic trouble code number is (8 or N), it indicates a problem with B3 Right Track Motor Speed Sensor. If the third digit of the diagnostic trouble code number is (7 or M), it indicates a problem with B7 Left Track Motor Speed Sensor. If the third digit of the diagnostic trouble code number is (6), it indicates a problem with B4 Transmission Speed Control Sensor. If the third digit of the diagnostic trouble code number is (5), it indicates a problem with B1 Decelerator Sensor. If the third digit of the diagnostic trouble code number is (4), it indicates a problem with B5 Left and Right Steer Sensor. If the third digit of the diagnostic trouble code number is (3), it indicates a problem with B2 FNR Sensor. If the third digit of the diagnostic trouble code number is (2), it indicates that battery voltage is less than 9 volts or more than 16.5 volts. If the third digit of the diagnostic trouble code number is (1), it indicates that at least one of the sensor voltage wires is less than 4.75 volts or more than 5.25 volts. The last two digits of diagnostic trouble code number indicate specific failures. The number 3 means the transmission controller has diagnosed a problem in the transmission area and has sent a diagnostic trouble code to the controller window to be displayed. The letter F means that a fault has occurred. The diagnostic trouble code number is indicated by an F3 plus two other digits. Investigate circuit failure identified by diagnostic trouble code. When diagnostic trouble code appears, shut engine off and restart engine to check if diagnostic trouble code is an intermittent problem. Transmission controller diagnostic trouble codes will display when malfunction occurs. If you want to repair your John Deere machinies, you are needing all this information, it is an valious information. They are on-the-job guides containing only the vital information needed for diagnosis, analysis, testing and repair.Transmission Controller Diagnostic Trouble Codes And Calibration Codes Technical Manuals are concise guides for specific machines. At the beginning of each group are summary listings of all applicable essential tools, service equipment and tools, other materials needed to do the job, service parts kits, specifications, wear tolerances, and torque values. Information is organized in groups for the various components requiring service instruction. Operation and tests sections help you identify the majority of routine failures quickly. Repair sections tell how to repair the components. The John Deere 750C, 750C Series II, 850C, 850C Series II Crawler Dozer Technical manuals are divided in two parts: Repair and Operation and Tests. Read the safety messages in the introduction of this manual and the cautions presented throughout the text of the manual. Essential tools required in performing certain service work are identified in this manual and are recommended for use. This manual is written for an experienced technician and Owners.
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