Overview
The ZF 4699.372.079 STEERING PINION is a critical component within the steering gear assembly of heavy-duty ZF transmissions, specifically engineered for the WG100, WG130, and WG131 series. This OEM genuine part converts rotational input from the steering column into linear motion, directing hydraulic fluid to actuate the steering cylinder. Positioned within the 4699101045 HOUSING, the pinion ensures precise steering response under extreme loads. The SKU 4699.372.079 is manufactured to ZF’s exacting tolerances, guaranteeing seamless integration with the 4699301108 HOUSING and the 4699301085 COVER assembly. Without this pinion, the transmission’s steering circuit cannot maintain directional control, making it a non-negotiable part for operational safety.
Symptoms of Failure
When the ZF 4699.372.079 steering pinion wears out, operators will notice distinct performance degradation. Common failure symptoms include:
- Erratic steering response or “dead spots” – The pinion’s teeth wear unevenly, causing intermittent loss of hydraulic pressure during turns.
- Oil leaks around the steering gear housing – Worn pinion seals allow transmission fluid to escape, often pooling near the 4699301014 THREAD PROTECTIVE SHIELD.
- Increased steering effort at low speeds – A damaged pinion cannot properly meter hydraulic flow, requiring more force to maneuver.
- Metallic grinding noises during articulation – Metal-on-metal contact from a failing pinion produces audible scraping sounds.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4699.372.079 |
| Material | Case-hardened alloy steel |
| Overall Length | 185 mm |
| Spline Diameter | 28 mm |
| Tooth Count | 12 (involute profile) |
| Weight | 1.45 kg |
| OEM Reference | ZF 4699.372.079 |
| Surface Treatment | Phosphate coating |
Compatibility
This steering pinion is specifically designed for ZF WG-series power shift transmissions. Verified compatible models include WG100, WG130, and WG131. It may also fit WG180 and WG200 series when used with the correct 0634303141 O-RING and 0734307407 PROTECTION CAP. Always cross-reference your transmission’s serial number with the 0634301843 SHAFT SEAL dimensions to ensure proper fitment. The pinion interfaces directly with the 0630502034 RETAINING RING and 0637885612 BREATHER assembly in these models.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101045 | HOUSING | Encloses the steering pinion and valve assembly |
| 4699301108 | HOUSING | Secondary housing for steering gear support |
| 4699301085 | COVER | Seals the steering gear cavity |
| 4699301014 | THREAD PROTECTIVE SHIELD | Prevents thread damage during installation |
| 0634303141 | O-RING | Hydraulic seal between pinion and housing |
| 0734307407 | PROTECTION CAP | Covers exposed spline end |
| 0634301843 | SHAFT SEAL | Prevents fluid leakage along the pinion shaft |
| 0630502034 | RETAINING RING | Secures pinion axial position |
| 0637885612 | BREATHER | Equalizes pressure in steering gear |
| 0636102023 | CAP SCREW | Fastens the cover to the housing |
ZF 4699.372.079 STEERING PINION – Gear RFQ Support
Use ZF 4699.372.079 STEERING PINION as the reference when requesting gear support. Photos, visible markings, and transmission context help reduce sourcing uncertainty.
Part-Number Summary
Use ZF number 4699.372.079 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: LOOSE PARTS
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 | 4699.372.079 |
|---|---|
| Normalized SKU | 4699372079 |
| Part name | STEERING PINION |
| 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.
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- ZF 4143.142.022 GEAR SHIFT SENSOR
