Massey Ferguson 13.X.2E – TRANS1: Park Brake System Pressure Issue Dyna VT

This code indicates an anomaly in the hydraulic pressure within the park brake circuit of the continuously variable transmission (CVT). The system is detecting that the hydraulic pressure required to release or engage the park brake is either too high, too low, or not matching the commanded state. This can be caused by a faulty pressure sensor, a sticking park brake solenoid, damaged wiring, or a restriction in the hydraulic system (such as a clogged filter).

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 7400 Series (7485, 7490, 7495)
• 7600 Series (7614-7626)
• 7700 Series (7714-7726)
• 8600 Series (8650, 8660, 8670, 8690)
• 8700 Series

1. 1

   Verify the transmission/hydraulic oil level and look for a blocked filter warning light, which can indicate brake disc friction material is breaking up and clogging the system.

2. 2

   Inspect the wiring harness and connectors going to the park brake pressure sensor and the park brake release solenoid on the transmission valve block for corrosion, chafing, or loose pins.

3. 3

   Test the park brake indirect switch in the cab and the ParkLock proximity switch on the axle (a failure here can trigger related codes).

4. 4

   Use a manual pressure gauge on the transmission test port to verify if the actual hydraulic pressure matches the sensor's reading.

1. 1

   Secure the Machine

   Park the tractor on level ground. Securely chock the wheels to prevent the tractor from rolling.

2. 2

   Relieve Pressure

   Turn off the engine and cycle the hydraulic controls to relieve residual accumulator pressure in the system.

3. 3

   Component Replacement (Sensor/Solenoid)

   Locate the park brake pressure sensor and solenoid on the Dyna-VT transmission block. Disconnect the electrical harness. Unthread the faulty sensor or solenoid valve. Install the new component, ensuring any O-rings are lubricated with clean hydraulic fluid. Torque to OEM specifications.

4. 4

   Filter Replacement (If Contaminated)

   If diagnostics point to a clogged filter causing the pressure issue, drain the hydraulic fluid, replace the hydraulic transmission oil filter, and refill the system with the approved Massey Ferguson transmission fluid.

5. 5

   System Bleed and Calibration

   Start the tractor and allow it to reach operating temperature. Check for leaks around the new sensor/solenoid. Engage and disengage the park brake multiple times to bleed any trapped air from the valve block.

6. 6

   Clear Codes

   Connect the diagnostic tool (e.g., Wintest software or the tractor's Dash Control Center) and clear the 13.X.2E fault code from the TRANS1 module.