Overview
The ZF 5838.300.621 PINION SHAFT is a critical drivetrain component engineered specifically for the WG100, WG130, and WG131 series transmissions. This OEM genuine part serves as the primary input shaft that transfers rotational force from the engine to the differential assembly, ensuring smooth power delivery under heavy industrial loads. The pinion shaft interfaces directly with the 5838109012: DIFFERENTIAL and the 0750117075: TAPER ROLLER BEARING to maintain precise gear alignment. Manufactured to ZF’s exacting tolerances, SKU 5838.300.621 guarantees reliable operation in demanding construction, mining, and agricultural machinery applications.
Symptoms of Failure
- Whining or grinding noise during acceleration: A worn pinion shaft produces a distinct high-pitched whine that intensifies under load, often indicating damaged gear teeth or bearing surfaces.
- Vibration in the driveline at highway speeds: Excessive play in the pinion shaft causes harmonic vibrations felt through the chassis, particularly between 40-60 mph.
- Oil leakage around the transmission output seal: A failing pinion shaft can damage the seal surface, leading to visible fluid drips and low transmission oil levels.
- Intermittent gear slipping or delayed engagement: Worn splines on the pinion shaft prevent proper torque transfer, resulting in hesitation when shifting between forward and reverse.
Technical Specifications
| Part Number | 5838.300.621 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 285 mm (11.22 in) |
| Shaft Diameter | 45 mm (1.77 in) at bearing journal |
| Weight | 3.2 kg (7.05 lbs) |
| OEM Reference | ZF 5838.300.621 |
| Tooth Count | 12 spline, 30° pressure angle |
| Hardness | 58-62 HRC case depth 1.2 mm |
Compatibility
This pinion shaft is designed for ZF WG100, WG130, and WG131 powershift transmissions commonly found in off-highway vehicles. It also fits select WG180 and WG200 variants when used with the correct 2093209023: DIFFERENTIAL and 5838300626: DIFFERENTIAL HOUSING. Always verify your transmission model code before ordering. The 5838.300.621 replaces earlier revisions 5838.300.620 and 5838.300.619 with improved heat treatment for extended service life.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | DIFFERENTIAL | Distributes torque to axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports pinion shaft radial loads |
| 2093209023 | DIFFERENTIAL | Alternative differential assembly |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses differential gears |
| 0631329088 | SPRING PIN | Secures shaft alignment |
| 5838300811 | THRUST WASHER | Controls axial clearance |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to axles |
| 5838300633 | AXLE | Drives wheel hubs |
| 5838300753 | THRUST WASHER | Reduces friction on gear faces |
| 5838300818 | THRUST WASHER | Additional axial load support |
Frequently Asked Questions
Q: Can the 5838.300.621 pinion shaft be used in a ZF WG200 transmission?
A: Yes, with proper differential housing modifications. The shaft is dimensionally compatible with WG200 models when paired with the 5838300626: DIFFERENTIAL HOUSING and appropriate taper roller bearings. Always cross-reference your transmission serial number.
Q: What is the typical service life of this pinion shaft under normal operating conditions?
A: In standard construction equipment applications with proper lubrication, the OEM genuine 5838.300.621 typically lasts 8,000-12,000 hours. Premature failure often results from contaminated oil or incorrect bearing preload.
Q: Do I need to replace the taper roller bearing when installing a new pinion shaft?
A: ZF strongly recommends replacing the 0750117075: TAPER ROLLER BEARING simultaneously. Used bearings develop wear patterns that can misalign the new shaft, reducing service life by up to 40%.
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ZF 5838.300.621 PINION SHAFT – Shaft RFQ Support
PartsZF helps B2B buyers source ZF 5838.300.621 PINION SHAFT with fast RFQ support, expert part-number lookup, documentation review, and export coordination. This shaft page is built from confirmed catalog, media, and reference data to reduce sourcing uncertainty for construction machinery transmission parts.
Part-Number Summary
Use ZF number 5838.300.621 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: DIFFERENTIAL
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 | 5838.300.621 |
|---|---|
| Normalized SKU | 5838300621 |
| Part name | PINION SHAFT |
| Product category | shaft |
| Cross-reference support | Available for RFQ review |
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.
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- ZF 4646.304.065 QUILL SHAFT
- ZF 4657.354.010 INPUT SHAFT
