Overview
The ZF 4108.203.044 PUMP SHAFT is a critical rotating component within the oil pump drive assembly of ZF WG100, WG130, and WG131 transmissions. This OEM genuine part transfers torque directly from the gear train to the hydraulic pump, ensuring consistent oil pressure for clutch actuation and lubrication. The SKU 4108.203.044 is precision-machined to factory tolerances, making it essential for maintaining proper hydraulic flow in heavy-duty commercial vehicle transmissions. When installed alongside the 4108101031: HOUSING and 4108303155: HOUSING, this shaft forms the sealed pump drive unit that prevents contamination and ensures reliable operation.
Symptoms of Failure
- Hydraulic pump whining noise under load – A worn pump shaft causes misalignment, producing a high-pitched whine during gear engagement or acceleration.
- Intermittent gear slipping or delayed engagement – Reduced oil pressure from a damaged shaft leads to clutch pack slippage, especially in WG130 models under heavy torque.
- Oil leaks near the pump housing interface – Shaft wear damages the sealing surface, causing fluid seepage around the 0630361037: SEALING CAP and adjacent housing joints.
- Metal debris in transmission oil pan – Flaking or pitting on the shaft splines generates metallic particles, often detected during routine oil changes.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4108.203.044 |
| Material | Case-hardened alloy steel (16MnCr5 equivalent) |
| Overall Length | 185 mm (estimated) |
| Spline Diameter | 22 mm (input end) |
| Weight | 0.85 kg (1.87 lbs) |
| OEM Reference | ZF 4108.203.044 |
| Surface Finish | Ground and polished, Rz ≤ 6.3 µm |
Compatibility
This pump shaft is engineered for ZF WG-series transmissions, specifically the WG100, WG130, and WG131 models. These units are commonly found in municipal trucks, fire apparatus, and medium-duty construction vehicles. The 4108.203.044 is not interchangeable with WG180 or WG200 variants due to different spline counts and shaft lengths. For proper sealing, always pair this shaft with a new 0636302015: SCREW PLUG and inspect the 0730361010: SEALING CAP for wear during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101031 | HOUSING | Encloses pump shaft and gear assembly |
| 4108303155 | HOUSING | Secondary housing for pump drive support |
| 0636302015 | SCREW PLUG | Seals oil passages in pump housing |
| 0630361037 | SEALING CAP | Prevents oil leakage at shaft exit point |
| 0730361010 | SEALING CAP | Alternate cap for high-temperature applications |
| 0736305007 | SCREW PLUG | Threaded plug for pressure test ports |
| 0634801165 | SEALING RING | Copper ring for flange joint sealing |
| 0730365280 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Locating stud for housing alignment |
| 4108108019 | INTERM.GEARBOX | Intermediate gearbox for PTO drive |
ZF 4108.203.044 PUMP SHAFT – Shaft RFQ Support
For ZF 4108.203.044 PUMP SHAFT, send the part number, removed-part photos, and application context so PartsZF can prepare a focused sourcing response.
Part-Number Summary
Use ZF number 4108.203.044 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
This shaft supports drivetrain and transmission shaft replacement planning. Send machine, transmission, or removed-part evidence with your RFQ for faster review.
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 | 4108.203.044 |
|---|---|
| Normalized SKU | 4108203044 |
| Part name | PUMP SHAFT |
| Product category | shaft |
| 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
- ZF 2094.110.011 P.T.O. SHAFT
- ZF 2094.110.014 P.T.O. SHAFT
- ZF 4642.303.002 OUTPUT SHAFT
- ZF 2093.110.011 P.T.O. SHAFT
- ZF 5838.300.106 INPUT SHAFT
