Overview
The ZF 4143.335.044 HELICAL GEAR is a precision-machined component engineered for the auxiliary drive and power take-off (PTO) circuits within ZF WG100, WG130, and WG131 transmission assemblies. This gear transfers rotational force between parallel shafts, reducing noise and vibration through its angled tooth design. As an OEM genuine part, the SKU 4143.335.044 ensures exact fitment and load-bearing capacity for heavy-duty industrial applications. It sits directly on the countershaft cluster, meshing with the main drive gear to maintain consistent torque delivery in both forward and reverse operations.
Symptoms of Failure
- Whining or grinding noise during gear engagement: Worn helical teeth create a high-pitched whine under load, especially noticeable when shifting between forward and reverse in WG100 series transmissions.
- Intermittent power loss to PTO output: A chipped or cracked 4143.335.044 gear causes the auxiliary drive to slip, resulting in erratic hydraulic pump performance or complete loss of PTO function.
- Metal debris in transmission oil pan: Flaking or spalling on the gear face deposits fine metallic particles in the lubricant, often detected during routine oil changes or filter inspections.
- Hard shifting or gear clash: Excessive backlash from a worn helical gear leads to delayed engagement and a distinct “clunk” when the transmission shifts between speed ranges.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4143.335.044 |
| Gear Type | Helical, Single Cut |
| Outside Diameter | Approx. 145 mm |
| Face Width | 32 mm |
| Bore Diameter | 45 mm (splined) |
| Material | Case-Hardened Alloy Steel (20MnCr5) |
| Weight | 1.85 kg |
| OEM Reference | ZF 4143.335.044 |
| Helix Angle | 25° (estimated) |
Compatibility
This helical gear is specifically designed for ZF’s HL 100 Series and HL 270 Series transmission families. It is a direct replacement for units in the WG100, WG130, and WG131 models. The gear also fits select WG180 and WG200 variants that share the same countershaft cluster geometry. Always verify the spline count and tooth profile against your existing part before installation. For complete assembly, pair this gear with the 4143101016 HOUSING and 4143301039 HOUSING to ensure proper alignment. Use a new 0501318136 GASKET and 0636101084 CAP SCREW during reassembly to prevent oil leaks.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101016 | HOUSING | Encloses the gear cluster and supports bearing journals |
| 4143301039 | HOUSING | Rear housing section for auxiliary drive alignment |
| 0501318136 | GASKET | Seals the housing mating surfaces against oil leakage |
| 0636101084 | CAP SCREW | Fastens the housing halves with precise torque |
| 0750108044 | PLUG | Closes unused ports in the transmission casing |
| 0636302014 | SCREW PLUG | Threaded plug for oil drain or fill points |
| 0634801057 | SEALING RING | Provides a leak-proof seal under the screw plug |
| 0730365092 | TYPE PLATE | Identification plate riveted to the housing |
| 4143201019 | VALVE INSERT | Controls hydraulic flow to the clutch packs |
| 0634306198 | O-RING | Seals the valve insert bore against pressure loss |
ZF 4143.335.044 HELICAL GEAR – Gear RFQ Support
ZF 4143.335.044 HELICAL GEAR is handled as a gear-train sourcing item for transmission repair teams. PartsZF can review the part number and documentation before quotation.
Part-Number Summary
Use ZF number 4143.335.044 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: SPUR GEAR DRIVE
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 | 4143.335.044 |
|---|---|
| Normalized SKU | 4143335044 |
| Part name | HELICAL 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
- ZF 4661.302.010 GEAR
- 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
