Overview
The ZF 4656.183.279 LOOSE PARTS kit is a critical service component designed specifically for the WG 171 Series transmission. This OEM genuine assembly includes all necessary seals, retainers, and small hardware required to maintain the integrity of the transmission’s internal oil circuit and gear train alignment. Positioned within the main gear housing, this kit interfaces directly with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to ensure precise oil flow and component retention. The SKU 4656.183.279 is a factory-matched set that eliminates guesswork during rebuilds, providing every loose part needed to restore the WG171 to factory tolerances.
Symptoms of Failure
When the ZF 4656.183.279 LOOSE PARTS assembly begins to degrade, operators will notice distinct operational issues. Oil leaks at the front housing seam are the most common early indicator, often accompanied by erratic gear engagement under load. As the internal seals and spacers wear, you may experience low hydraulic pressure warnings on the dash, leading to slipping in second and third gears during uphill climbs. A less obvious symptom is metal debris in the transmission pan, which signals that the loose parts have fatigued and are shedding material into the oil circuit. Addressing these issues promptly with the 4656.183.279 kit prevents cascading damage to the SCREEN SHEET and the TUBE assembly.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4656.183.279 |
| Material Composition | Steel alloy with nitrile rubber seals |
| Overall Dimensions | 120 mm x 80 mm x 45 mm (kit packaging) |
| Weight | 0.85 kg (1.87 lbs) |
| OEM Reference | ZF WG171 Series |
| Included Components | Retaining rings, spacers, O-rings, dowel pins |
Compatibility
This LOOSE PARTS kit is engineered for the ZF WG 171 transmission series, but its design principles extend to closely related models. It is fully compatible with the WG180 and WG200 series when used in conjunction with the correct HOUSING REAR PART. The kit also fits select WG150 variants that share the same front housing bolt pattern. Always verify your transmission’s serial number against the 4656.183.279 application chart; the kit is not intended for the WG250 or WG300 series without additional adapter components. For proper installation, pair this kit with the O-RING and CAP SCREW to ensure a leak-free seal.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Main structural casing for gear and shaft alignment |
| 4656301066 | HOUS.FRONT SECT | Front section housing for input shaft and pump |
| 4656201015 | SCREEN SHEET | Oil filter screen protecting valve body from debris |
| 4656301037 | TUBE | Oil delivery tube between pump and cooler |
| 0634313514 | O-RING | Seals housing joints against oil leakage |
| 0636100803 | CAP SCREW | Fastener for securing housing sections |
| 4656301042 | HOUSING REAR PART | Rear housing section for output shaft support |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing mating |
| 0636100801 | CAP SCREW | Bolt for valve body attachment |
| 0636100160 | CAP SCREW | Fastener for oil pan retention |
Frequently Asked Questions
Q: Can the ZF 4656.183.279 LOOSE PARTS kit be reused after disassembly?
A: No. This kit contains single-use O-rings and retaining rings that lose their sealing integrity after removal. Always install a fresh 4656.183.279 kit during any WG171 rebuild to prevent premature oil leaks.
Q: How do I know if my WG171 needs this kit versus a full overhaul?
A: If you only observe oil seepage at the front housing joint or slight gear slippage, the 4656.183.279 kit is sufficient. However, if you hear grinding noises or have lost all forward gears, a complete transmission rebuild with the housing and tube assemblies is required.
Q: Does this kit include the necessary cap screws for installation?
A: The 4656.183.279 kit includes only the loose parts (spacers, pins, O-rings). For fasteners, you must order the CAP SCREW and CAP SCREW separately to complete the assembly.
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