Massey Ferguson 14.02.02 – TRANS1: High Pressure Brake System Pressure Too Low DYNA 6 (TRANS1)

The transmission control system has detected that the hydraulic or pneumatic pressure in the high-pressure braking system (which often includes the handbrake or trailer brake circuit) has dropped below the minimum threshold required for safe operation. When this pressure is too low, the tractor's safety systems may prevent the transmission from engaging, resulting in a loss of drive.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 5455
• 6465
• 6475
• 6480
• 6614
• 6615
• 6616
• 6713 S
• 6714 S
• 6715 S
• 6716 S
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 7714 S
• 7715 S
• 7716 S
• 7718 S
• 7719 S
• 7720 S
• 7722 S
• 7724 S
• 7726 S
• 8670
• 8680
• 8690
• 8727
• 8730

1. 1

   Pneumatic/Trailer Connections: If the tractor is hooked up to an implement, check the condition of the air connection couplers. A leak in the implement's braking system or the pneumatic couplers will cause a pressure drop.

2. 2

   Fluid Levels and Filters: Check the hydraulic fluid levels and quality. Look for a blocked filter warning light on the dash, which strongly indicates internal brake discs have worn down to the metal.

3. 3

   Sensor and Wiring Inspection: Inspect the handbrake/trailer brake pressure sensor, its wiring harness, and connectors for physical damage, corrosion, or electrical shorts.

4. 4

   Hydraulic Pump: Verify the hydraulic pump operation and check related fuses to ensure the system is capable of building pressure.

1. 1

   Secure the Tractor

   Park the tractor on flat ground, turn off the engine, and relieve any residual hydraulic/pneumatic pressure.

2. 2

   Address External Leaks

   If the diagnostic checks revealed leaks at the air connection couplers or implement lines, repair or replace the faulty hoses/couplers.

3. 3

   Replace the Pressure Sensor

   If the system is building pressure but the module reads it as low, the sensor is likely faulty. Locate the handbrake/trailer brake pressure sensor on the transmission brake valve block. Disconnect the electrical connector. Unscrew the faulty sensor and install the new OEM sensor. Reconnect the wiring harness.

4. 4

   Address Internal Brake Failure

   If the hydraulic fluid is contaminated with metal filings from worn brakes (often caused by driving with the handbrake engaged): Do not drive the tractor to prevent further damage to the back end. Flush the entire hydraulic system to remove debris. Split the rear end of the tractor to access the brake assemblies. Replace the worn brake discs (and handbrake ceramic discs). Reassemble and refill with fresh, approved hydraulic fluid.

5. 5

   Clear Codes and Calibrate

   Use a diagnostic tool to clear the 14.02.02 fault code. Warm up the transmission oil (between 35°C and 45°C) and perform a Dyna-6 transmission calibration if required.