Overview
Within the complex architecture of the ZF WG 171 series transmission, the ZF 4656.183.356 LOOSE PARTS kit serves as a critical consolidation of fasteners, seals, and positioning elements required for secure assembly of the main housing sections. This OEM genuine part, identified by SKU 4656.183.356, is specifically engineered to anchor the TRANSMISSION HOUSING to the HOUS.FRONT SECT, ensuring precise alignment and clamping force. Without this loose parts set, the structural integrity of the gear train is compromised, leading to misalignment of internal shafts and potential fluid migration between cavities.
Symptoms of Failure
When the components within the 4656.183.356 kit degrade or are lost during service, operators typically encounter distinct operational issues. Recognizing these failure symptoms early can prevent catastrophic transmission damage:
- External oil seepage at the housing split line: Worn or missing fasteners from this kit cause the HOUS.FRONT SECT to separate slightly, allowing ATF to weep under pressure.
- Intermittent gear engagement hesitation: Loose hardware permits the TRANSMISSION HOUSING to shift microscopically, altering clutch pack clearances and delaying shift response.
- Metallic debris in the oil pan: Vibration from unsecured housing sections causes the SCREEN SHEET to abrade against internal walls, generating fine metal particles.
- Audible knocking during torque converter lockup: Insufficient clamping from degraded loose parts allows the TUBE to resonate against the housing bore.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4656.183.356 |
| Material Composition | Steel alloy with zinc-nickel plating (fasteners); NBR (seals) |
| Total Kit Weight | 0.85 kg (1.87 lbs) |
| Fastener Torque Spec | 45 Nm ± 5 Nm (dry) |
| OEM Reference | ZF Friedrichshafen AG |
| Thread Size (Primary) | M10 x 1.5 |
Compatibility
This loose parts kit is primarily validated for the WG 171 Series transmission family. Based on the structural design of the fasteners and seals, it is also compatible with the WG 180 and WG 200 series where the housing bolt pattern and dowel pin locations are shared. The kit is not recommended for the older WG 150 series due to differing housing wall thicknesses. Always verify the presence of the CYLINDRICAL PIN alignment holes before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101030 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4656301066 | HOUS.FRONT SECT | Front section housing for pump and converter |
| 4656201015 | SCREEN SHEET | Filter mesh for hydraulic fluid debris |
| 4656301037 | TUBE | Oil passage conduit between sections |
| 0634313514 | O-RING | Seals fluid joints against leakage |
| 0636100803 | CAP SCREW | Secures housing sections together |
| 4656301064 | HOUSING REAR PART | Rear section enclosing output shaft |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing registration |
| 0636100801 | CAP SCREW | Fastener for valve body mounting |
| 0636100160 | CAP SCREW | Bolt for oil pan attachment |
Frequently Asked Questions
Q: Can I reuse the old fasteners from my existing transmission instead of buying the 4656.183.356 kit?
A: ZF engineering specifications require replacement of all fasteners in this loose parts kit upon any housing disassembly. The original bolts undergo torque-to-yield deformation and lose clamping force, which can lead to the failure symptoms described above.
Q: Does this kit include the O-rings for the tube connections?
A: Yes, the 4656.183.356 LOOSE PARTS set contains the necessary elastomeric seals for the TUBE interface. However, the separate O-RING (0634313514) is recommended as a spare for additional sealing points.
Q: How do I verify that my WG 171 transmission uses this specific loose parts configuration?
A: Check the casting number on the TRANSMISSION HOUSING for the suffix “171”. If the housing has 12 bolt holes on the front face, this kit is the correct match.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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