12V 2.7KW Starter Motor 9142764 123708013 7006119M1 3597371R2 Fits Massey Ferguson Ursus

Pre-Installation Preparation

1. First, turn off the tractor engine and disconnect the negative battery cable to completely cut off the circuit, avoiding short circuits or electric shock hazards during installation.

2. Prepare suitable tools such as box-end wrenches, sockets, and screwdrivers of corresponding specifications. If components are rusted, prepare a wire brush or contact cleaner. Meanwhile, clean oil, dust, and rust around the starter motor mounting position, and inspect the mounting bracket for cracks or deformation. Repair any issues before proceeding.

3. Verify the specifications of the new 12V starter motor to ensure compliance with the tractor's original factory requirements (e.g., number of gear teeth, mounting hole positions) to prevent incompatibility.

Positioning and Placing the Starter Motor

Securing the Mounting Bolts

Connecting the Electrical Wiring

1. First, connect the starter motor's power cable (thick wire) to its main terminal post, securing it with a nut at a torque of approximately 9 to 10 N·m. Ensure good contact; a small amount of conductive paste may be applied to prevent rust.

2. Next, connect the control wire (thin wire) to the starter motor's solenoid switch terminal, also securing it firmly to avoid poor contact which may cause the starter motor to fail to operate.

3. If the wiring is equipped with brackets or clips, install and secure them simultaneously to prevent wire abrasion during operation.

Recheck and Power-On Testing

1. Reconnect the negative battery cable. Inspect all wiring connections and mounting bolts to ensure they are secure before testing.

2. Turn the tractor's ignition switch to observe if the starter motor operates smoothly without abnormal noise or jamming. Simultaneously, check if the engine can be normally cranked and started. If issues such as weak starting or no response occur, immediately cut off the power and inspect the wiring connections or the starter motor itself for faults.

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I. Safety Protection: Prevent Electric Shock and Mechanical Damage

1. Mandatory Power Disconnection:Before installation, always disconnect the negative battery cable (prioritize removing the negative terminal to avoid short circuits caused by tools touching the positive terminal and vehicle body). After power disconnection, wait for 5 minutes to discharge residual electricity in the circuit. Live operation of terminal posts is strictly prohibited.
2. Tool and Environmental Requirements:Use tools with insulated handles (e.g., insulated wrenches, sockets) to prevent tools from contacting both the starter’s main terminal and the engine block simultaneously. Clean oil, flammable materials from the work area and prohibit smoking to avoid hazards caused by short-circuit sparks.
3. Fall and Collision Prevention:The starter motor weighs approximately 3-8kg (varies by model). During installation, hold it firmly by hand or secure it with a bracket to prevent slipping and damaging the engine block or causing personal injury. Do not directly strike the starter housing or gear end cover with a hammer; only use a rubber mallet to gently tap the mounting bracket for auxiliary alignment.

II. Compatibility Verification: Avoid Post-Installation Malfunction

1. Precise Matching of Component Specifications:

• Confirm that the new starter’s voltage (12V), power, and number of gear teeth match the original factory specifications (the number of gear teeth for starters of some Massey Ferguson models is 9-11; verify the part number, e.g., original part numbers starting with "37Xxxx" or "185Xxxx").

• Check that the mounting hole spacing and bolt specifications (typically M8-M10 high-strength bolts) are fully compatible with the bracket. Avoid using excessively short bolts (which may cause loose fixation) or overly long bolts (which may damage the engine flywheel housing).

2. Inspection of Used Component Condition (Auxiliary Fault Diagnosis):After removing the old starter, inspect for gear wear (replace if there are chipped tooth surfaces or wear exceeding 0.5mm) and check if the solenoid switch contacts are ablated. If the old starter’s gear jamming is caused by flywheel ring gear wear, the flywheel ring gear must be inspected and repaired simultaneously; otherwise, the new starter may be easily damaged.

III. Installation Accuracy: Ensure Long-Term Stable Operation

1. Bolt Tightening Specifications:

• Use original-specification high-strength bolts (with lock washers) for installation. Tighten them gradually and symmetrically (torque strictly follows manual requirements: 35-40N·m for standard models, 45-50N·m for some high-horsepower models). Avoid over-tightening (which may cause bracket deformation or thread stripping) or insufficient tightening (which may cause vibration-induced loosening).

• If the mounting bracket is rusted or cracked, repair or replace it first (agricultural machinery operating environments are prone to mud and water erosion; insufficient bracket strength will cause starter vibration during operation and accelerate gear wear).

2. Gear Meshing Clearance Check:After installation, manually rotate the starter gear to ensure smooth meshing with the flywheel ring gear (clearance: approximately 0.3-0.8mm) without jamming or seizing. If the clearance is too small, abnormal "gear clashing" noise will occur during startup; adjust the mounting shims (some models are equipped with adjustment shims at the bracket) as needed.

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References：

1. Third-Party Maintenance and Parts Documentation for Massey Ferguson Tractors

• 12V starter motor upgrade documents for the brand’s TO-20 and TO-30 models released by Smith Co Electric;

• Core process guidelines for starter motor replacement on the MF390 model published on the Farming Parts website;

• Basic specifications mentioned on Tractor Data (e.g., disconnecting the negative battery cable first when removing/installing the starter motor), which are consistent with the electrical safety key points in the precautions.

2. Agricultural Machinery and General Starter Motor Maintenance Industry Standards

• The recommended torque range of 35-40N·m for starter mounting bolts;

• The use of a wire brush to clean terminal posts.

3. Agricultural Machinery Parts Specification and Parameter Documents