Overview
This ZF 4656.073.034 3 WG 171 Powershift Transmission Assembly is a complete, factory-matched unit engineered for heavy-duty industrial applications. As the core power transfer module in the WG 171 series, this assembly integrates the main drive components, clutch packs, and hydraulic control circuits into a single ready-to-install package. The SKU 4656.073.034 replaces worn or failed assemblies in wheel loaders, forklifts, and construction machinery, restoring full torque capacity and shift quality. It sits directly between the engine flywheel and the final drive, managing gear engagement under high load conditions.
Symptoms of Failure
- Delayed or harsh gear engagement — When the internal clutch packs or valve body wear, operators experience a noticeable lag or jarring shift when moving from neutral to forward or reverse.
- Transmission fluid leaks from housing seams — Cracks or warping in the TRANSMISSION HOUSING or HOUS.FRONT SECT allow hydraulic oil to escape, leading to low pressure and slipping.
- Intermittent power loss under load — Worn internal seals or damaged SCREEN SHEET elements restrict oil flow, causing the transmission to lose torque when climbing grades or lifting heavy loads.
- Unusual whining or grinding noises — Debris contamination or a blocked TUBE assembly starves bearings of lubrication, producing audible metal-on-metal sounds.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4656.073.034 |
| Assembly Type | Complete Powershift Transmission (3 WG 171) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| OEM Reference | ZF 4656.073.034 |
| Seal Kit Required | 0634313514: O-RING |
| Fastener Spec | 0636100803: CAP SCREW (M12 x 1.75) |
Compatibility
This complete unit is designed specifically for the ZF WG 171 series, but it also shares mounting patterns and hydraulic interfaces with the WG 180 and WG 200 families. It is commonly retrofitted into older WG 150 and WG 160 chassis when upgrading to higher torque capacity. The assembly directly replaces part numbers 4656.073.031 and 4656.073.032. For rear housing integration, verify alignment with the HOUSING REAR PART and secure using CYLINDRICAL PIN alignment dowels. Additional fasteners such as CAP SCREW (0636100801) and CAP SCREW (0636100160) are required for full installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Main structural casing for gear and clutch assembly |
| 4656301066 | HOUS.FRONT SECT | Front section housing input shaft and pump drive |
| 4656201015 | SCREEN SHEET | Fine mesh filter protecting hydraulic valve body |
| 4656301037 | TUBE | Oil delivery tube for clutch pack lubrication |
| 0634313514 | O-RING | Seals housing joints against fluid leaks |
| 0636100803 | CAP SCREW | M12 fastener for housing flange connection |
| 4656301042 | HOUSING REAR PART | Rear casing supporting output shaft and PTO |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing positioning |
| 0636100801 | CAP SCREW | M10 fastener for front section attachment |
| 0636100160 | CAP SCREW | M8 fastener for screen sheet cover plate |
Frequently Asked Questions
Q: Can this assembly be installed without replacing the housing sections?
A: Yes, but we strongly recommend inspecting the TRANSMISSION HOUSING and HOUS.FRONT SECT for cracks or wear. Reusing damaged housings will void the warranty on the new assembly.
Q: What is the typical service life of the 4656.073.034 unit?
A: Under normal operating conditions with proper fluid changes, this assembly lasts 8,000–10,000 hours. Premature failure often results from a clogged SCREEN SHEET or damaged TUBE assembly.
Q: Are the cap screws included with the complete unit?
A: No. You must order CAP SCREW (0636100803), CAP SCREW (0636100801), and CAP SCREW (0636100160) separately for a complete installation.
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Phone: +86 158 2286 3467 |
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