Overview
The ZF 4699.302.078 SPUR GEAR is a critical power transmission component engineered for the WG100, WG130, and WG131 series transmissions. This OEM genuine part transfers rotational force between parallel shafts within the gear train, ensuring precise speed regulation and torque delivery. The spur gear’s straight-cut teeth mesh directly with adjacent gears in the intermediate shaft assembly, making it indispensable for smooth gear engagement under heavy loads. As a factory-spec replacement, SKU 4699.302.078 restores original performance and eliminates drivetrain inefficiencies caused by worn or damaged gears.
Symptoms of Failure
- Whining or grinding noise during acceleration: Worn tooth profiles on the 4699.302.078 spur gear produce a high-pitched whine or metallic grinding, especially under load, indicating uneven wear or pitting.
- Intermittent gear slipping or jumping: When the spur gear’s teeth lose their original profile, the transmission may momentarily lose engagement, causing sudden RPM surges or hesitation during shifting.
- Metal particles in transmission fluid: Advanced wear or chipping of the spur gear sheds ferrous debris into the oil, often visible during fluid changes or as sludge in the pan.
- Vibration through the gearshift lever: A failing spur gear creates irregular rotational motion, transmitting noticeable vibration into the cab or chassis at specific speeds.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4699.302.078 |
| Type | Spur Gear (Straight-Cut) |
| Material | Case-Hardened Alloy Steel (20MnCr5 Equivalent) |
| Outside Diameter | ~112 mm |
| Tooth Count | 28 Teeth (Estimated) |
| Bore Diameter | ~35 mm |
| Face Width | ~32 mm |
| Weight | ~1.8 kg |
| OEM Reference | ZF 4699.302.078 |
Compatibility
This spur gear is specifically designed for ZF WG100, WG130, and WG131 transmissions. It is also compatible with the WG180 and WG200 series when used in the auxiliary drive gear train. Always verify the gear’s tooth count and bore dimensions against your existing part before installation. The 4699.302.078 replaces the original gear in the countershaft cluster and works in conjunction with the 4699101046 HOUSING and 4699301109 HOUSING to maintain proper gear alignment. For complete assembly, pair it with the 4699301017 BEARING COVER and 4699301085 COVER to seal the gear cavity and prevent contamination.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101046 | HOUSING | Encloses gear assembly, provides structural support |
| 4699301109 | HOUSING | Secondary housing for countershaft bearing support |
| 4699301017 | BEARING COVER | Seals bearing cavity, prevents lubricant loss |
| 4699301085 | COVER | Protects gear end from debris ingress |
| 4699301014 | THREAD PROTECTIVE SHIELD | Guards housing threads during installation |
| 0634303141 | O-RING | Creates leak-proof seal between housing halves |
| 0734307407 | PROTECTION CAP | Covers exposed shaft ends during transport |
| 0634309600 | SHAFT SEAL | Prevents fluid leakage at gear shaft exit |
| 0637885612 | BREATHER | Equalizes internal pressure, vents moisture |
| 0636102023 | CAP SCREW | Secures housing and cover fasteners |
ZF 4699.302.078 SPUR GEAR – Gear RFQ Support
Use ZF 4699.302.078 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 4699.302.078 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: INPUT
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 | 4699.302.078 |
|---|---|
| Normalized SKU | 4699302078 |
| 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: fallback. 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
