Massey Ferguson 13.01.0E – TRANS1: Hydraulic Trailer Brake Solenoid Issue

The tractor's electronic control system has detected an electrical anomaly (such as an open circuit, short circuit, or abnormal amperage draw) or a functional failure in the solenoid responsible for actuating the hydraulic trailer brakes.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 6614
• 6615
• 6616
• 6711
• 6712
• 6713
• 8S.205
• 8S.225
• 8S.245
• 8S.265
• 8400 Series
• 8600 Series

1. 1

   Inspect the wiring harness leading to the hydraulic trailer brake solenoid for chafed wires, corrosion, or loose pins in the connector.

2. 2

   Disconnect the solenoid and use a multimeter to measure the resistance across the coil pins (infinite indicates open circuit, zero indicates dead short).

3. 3

   With the tractor running and brakes applied, back-probe the connector to verify the TRANS1 module is sending the correct voltage signal.

4. 4

   Check the main fuse box in the cab for any blown fuses related to the trailer brake or transmission control circuits.

1. 1

   Preparation

   Park the tractor on a level surface, engage the parking brake, turn off the engine, and disconnect the battery to prevent electrical shorts.

2. 2

   Locate the Solenoid

   Locate the hydraulic trailer brake valve block, which is typically mounted on the rear transmission housing near the hydraulic remote valves and trailer brake couplers.

3. 3

   Clean the Area

   Thoroughly clean the area around the solenoid with brake cleaner or compressed air to prevent dirt from contaminating the hydraulic system.

4. 4

   Disconnect

   Unplug the electrical wiring harness from the solenoid.

5. 5

   Removal

   If replacing just the coil: Remove the retaining nut at the end of the solenoid stem and slide the old coil off the valve cartridge. If replacing the entire valve: Unbolt the valve body from the hydraulic block. Have a catch pan ready, as some hydraulic fluid will leak out.

6. 6

   Installation

   Install the new solenoid coil or valve assembly. If installing a new valve, ensure the O-rings are lightly lubricated with clean hydraulic oil before insertion.

7. 7

   Torque

   Tighten the retaining nut or mounting bolts to the OEM torque specifications.

8. 8

   Reassembly

   Reconnect the electrical connector and reconnect the battery.

9. 9

   Bleed the System

   If the hydraulic circuit was opened (i.e., the valve cartridge was removed), bleed the trailer brake hydraulic lines to remove any trapped air.

10. 10

    Clear Codes & Test

    Use the tractor's dashboard interface or a diagnostic tool to clear the 13.01.0E fault code. Start the tractor and test the trailer brakes to confirm proper operation.