Overview
The ZF 0501.211.778 STARTER is a critical electromechanical component engineered specifically for the WG310 series of automatic transmissions. This OEM genuine part initiates the engine cranking cycle by engaging the flywheel ring gear, delivering the high-torque rotation required for combustion startup. Positioned on the bell housing interface of the transmission assembly, the starter motor (SKU: 0501.211.778) integrates directly with the transmission’s electrical and mechanical systems. For proper mounting and alignment, this starter works in conjunction with the 4646101130: TRANSMISSION HOUSING and the 4646301317: HOUSING, which provide the structural foundation for the starter’s installation.
Symptoms of Failure
- Intermittent no-crank condition: When the starter solenoid fails, the engine may not respond to ignition commands, leaving operators stranded. This is often accompanied by a single click from the solenoid.
- Grinding noise during engagement: Worn starter drive gears or a damaged flywheel ring gear produce a metallic grinding sound, indicating the starter is not meshing correctly with the transmission.
- Slow or labored cranking: Internal brush wear or bearing degradation reduces rotational speed, causing the engine to turn over sluggishly, especially in cold weather.
- Burning electrical smell: Overheating from excessive current draw due to shorted windings or seized bearings emits a distinct odor, signaling imminent starter failure.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0501.211.778 |
| OEM Reference | ZF 0501.211.778 |
| Weight | 5.2 kg (11.5 lbs) |
| Material | Die-cast aluminum housing, copper windings |
| Voltage | 24V DC |
| Power Rating | 4.5 kW |
| Mounting Bolt Pattern | 3-bolt flange, 10.5 mm diameter |
| Compatible Fasteners | 0636015304: HEXAGON SCREW (x3) |
Compatibility
This starter is primarily designed for the ZF WG310 series transmission, but it also fits select models in the WG180, WG200, and WG250 families due to shared bell housing dimensions. The part is interchangeable with earlier WG series units that utilize a 24V starter with a 3-bolt flange. Always verify the mounting interface and flywheel ring gear tooth count before installation. The starter’s housing is sealed using the 4646301301: COVER to protect internal components from debris and moisture ingress.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101130 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4646301317 | HOUSING | Secondary housing for valve body |
| 4646301301 | COVER | Protective seal for starter cavity |
| 0636015304 | HEXAGON SCREW | Fastener for starter mounting |
| 0636101828 | CAP SCREW | Secures transmission cover plate |
| 4646301102 | COVER SHEET | Thin gasket for oil sealing |
| 4646301285 | COVER SHEET | Secondary sealing shim |
| 0631311009 | GROOVED STUD | Alignment pin for housing assembly |
| 0636101193 | CAP SCREW | Fastener for oil pan |
| 0636010179 | HEXAGON SCREW | Bolt for bell housing attachment |
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