Overview
The ZF 4642.308.553 SPUR GEAR is a critical power transmission component engineered specifically for the WG 150 Series transmission. This OEM genuine spur gear transfers rotational force between parallel shafts within the gear train, ensuring precise torque delivery and smooth engagement under heavy-duty industrial loads. As a hardened steel gear, it directly meshes with adjacent shafts to maintain correct gear ratios and minimize driveline backlash. The SKU 4642.308.553 is an exact replacement part designed to restore factory performance in ZF WG150 units, and it is often installed alongside the 4642101117 TRANSMISSION HOUSING and the 4642301217 TRANSMISSION HOUSING during a full rebuild.
Symptoms of Failure
- Whining or grinding noise during gear engagement: Worn spur gear teeth produce a distinct metallic whine or grinding sound, especially under load, indicating tooth surface fatigue or pitting.
- Intermittent gear slipping or loss of power transfer: A damaged 4642.308.553 gear can cause the transmission to momentarily lose drive, resulting in hesitation or erratic acceleration during operation.
- Metal debris in transmission fluid: Flakes or particles found in the oil filter or sump are a clear sign of spur gear wear, often accompanied by reduced hydraulic pressure.
- Vibration through the driveline: Uneven tooth wear creates imbalance, transmitting noticeable vibration to the housing and output shaft, which can accelerate damage to the 0730365125 TYPE PLATE and surrounding seals.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4642.308.553 |
| Gear Type | Spur Gear (Straight Cut) |
| Material | Case-Hardened Alloy Steel (20MnCr5 equivalent) |
| Module | 4.5 mm (estimated) |
| Number of Teeth | 28 (estimated) |
| Outside Diameter | 135 mm (estimated) |
| Bore Diameter | 40 mm (estimated) |
| Face Width | 32 mm (estimated) |
| Weight | 1.8 kg (4.0 lbs) |
| OEM Reference | ZF 4642.308.553 |
| Surface Hardness | 58-62 HRC |
Compatibility
This spur gear is primarily designed for the ZF WG 150 Series transmission, but it also fits select models within the WG family due to shared gear train architecture. Compatible transmissions include the WG 150, WG 180, and WG 200 series, as well as some early WG 120 variants. Always verify the gear tooth count and shaft diameter against your unit. The 4642.308.553 gear works in conjunction with the 0631311009 GROOVED STUD for secure mounting, and it is commonly replaced alongside the 4642301168 SCREEN SHEET and 4642301169 SCREEN SHEET to prevent debris contamination.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101117 | TRANSMISSION HOUSING | Encloses and supports gear train assembly |
| 4642301217 | TRANSMISSION HOUSING | Secondary housing for auxiliary gear sets |
| 0730365125 | TYPE PLATE | Identification plate with transmission specs |
| 0631311009 | GROOVED STUD | Fastener for gear retention and alignment |
| 4642301168 | SCREEN SHEET | Filter screen for oil sump protection |
| 4642301169 | SCREEN SHEET | Secondary filter screen for hydraulic circuit |
| 0636100621 | HEXAGON SCREW | Fastener for housing and cover assembly |
| 0630361029 | SEALING CAP | Seals access ports against fluid leaks |
| 4642306254 | ADAPTER | Interface component for shaft connections |
| 0634303340 | O-RING | Static seal for fluid containment |
ZF 4642.308.553 SPUR GEAR – Gear RFQ Support
Use ZF 4642.308.553 SPUR GEAR as the reference when requesting gear support. Photos, visible markings, and transmission context help reduce sourcing uncertainty.
Part-Number Summary
Use ZF number 4642.308.553 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: COUPLING
Cross Reference Support
If you have an OEM number, old supplier number, or visible marking, include it with your RFQ so PartsZF can compare it with the available records.
Specification Snapshot
| ZF part number | 4642.308.553 |
|---|---|
| Normalized SKU | 4642308553 |
| Part name | SPUR GEAR |
| Product category | gear |
| RFQ support | Part-number lookup and documentation review |
| Media support | Product photo or diagram review when available |
Image and Documentation Notes
Current product media status: diagram. Product photos, diagram positions, and nameplate images help speed up part-number confirmation and quotation preparation.
RFQ Checklist
- ZF part number or OEM cross-reference number
- Machine model, transmission model, or nameplate photo
- Removed-part photos or visible markings
- Quantity, destination, and documentation requirements
- Final selection is confirmed by exact part number, machine context, and available documentation.
Related Parts
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- ZF 2094.306.024 GEAR SHIFT RAIL
- ZF 4642.353.026 SPUR GEAR
- ZF 4143.142.013 GEAR SHIFT SENSOR
- ZF 4143.142.022 GEAR SHIFT SENSOR
