Overview
The ZF 4143.303.061 HELICAL GEAR is a precision-machined component engineered for the auxiliary drive and power take-off (PTO) circuits within ZF WG100, WG130, and WG131 transmissions. This OEM genuine part, identified by SKU 4143.303.061, meshes directly with the countershaft to transfer torque from the engine to the hydraulic pump or secondary output. Constructed from case-hardened alloy steel, it ensures quiet operation and high load capacity under continuous industrial use. When installed, this helical gear sits in the lower gear train housing, where it must be paired with a secure 4143101017: HOUSING and a sealed 4143301039: HOUSING to maintain proper alignment and oil flow.
Symptoms of Failure
- Whining or howling noise during PTO engagement: Worn helical gear teeth create a distinct high-pitched whine that intensifies under load, often mistaken for bearing failure.
- Intermittent power loss to auxiliary hydraulics: As the gear profile wears, it slips under torque, causing the hydraulic pump to lose pressure and resulting in sluggish implement operation.
- Metallic debris in transmission oil filter: Flaking or pitting on the gear flanks sheds fine steel particles that accumulate in the sump, often accompanied by a burnt oil smell.
- Vibration through the shift lever or chassis: Uneven tooth wear creates radial runout, transmitting a low-frequency shudder through the driveline during acceleration.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4143.303.061 |
| Gear Type | Helical, Right-Hand Helix |
| Material | Case-Hardened 20MnCr5 Alloy Steel |
| Outside Diameter | 98.5 mm (est.) |
| Root Diameter | 82.3 mm (est.) |
| Face Width | 28.0 mm (est.) |
| Number of Teeth | 23 (est.) |
| Weight | 0.85 kg (1.87 lbs) |
| OEM Reference | ZF 4143.303.061 |
| Hardness | 58-62 HRC (case depth 0.8 mm) |
Compatibility
This helical gear is a direct OEM replacement for the following ZF transmission series: WG100, WG130, WG131. It also fits select variants of the WG180, WG200, and WG210 series when used in the auxiliary drive position. Always verify the gear train configuration; the 4143.303.061 is not compatible with the main drive helical set in WG150 or WG250 models. For proper installation, use a new 0501318136: GASKET between the housing flanges and torque the 0636101084: CAP SCREW to 45 N·m to prevent oil seepage.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101017 | HOUSING | Encloses the gear set and supports bearing bores |
| 4143301039 | HOUSING | Opposite-side housing for gear alignment |
| 0501318136 | GASKET | Seals the housing joint to prevent oil leaks |
| 0636101084 | CAP SCREW | Fastens housing halves with precise torque |
| 0750108044 | PLUG | Closes unused oil passages in the housing |
| 0636302014 | SCREW PLUG | Threaded plug for drain or inspection ports |
| 0634801057 | SEALING RING | Copper ring for plug sealing under pressure |
| 0730365159 | TYPE PLATE | Identification plate riveted to the housing |
| 4143201019 | VALVE INSERT | Hydraulic valve seat for PTO control |
| 0634306198 | O-RING | Seals the valve insert in the housing bore |
ZF 4143.303.061 HELICAL GEAR – Gear RFQ Support
Use ZF 4143.303.061 HELICAL GEAR as the reference when requesting gear support. Photos, visible markings, and transmission context help reduce sourcing uncertainty.
Part-Number Summary
Use ZF number 4143.303.061 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: OUTPUT
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 | 4143.303.061 |
|---|---|
| Normalized SKU | 4143303061 |
| 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
