Overview
The ZF 4657.199.023 LOOSE PARTS set is a critical OEM genuine service kit designed specifically for the WG 210 series transmission. This assembly contains the essential loose hardware and small components required to secure and align internal transmission elements during a rebuild or major repair. The SKU 4657.199.023 typically includes fasteners, locating pins, and sealing elements that interface directly with the 4657101033: TRANSMISSION HOUSING and the 4657201027: HOUS.FRONT SECT. Without this specific loose parts kit, proper torque specifications and alignment tolerances cannot be maintained, leading to premature wear of the gear train.
Symptoms of Failure
When the components within the ZF 4657.199.023 LOOSE PARTS set degrade or are omitted during service, operators will notice distinct failure modes. Transmission oil seepage from the housing mating surfaces is a primary indicator, often caused by missing or damaged sealing washers. Abnormal gear rattle or excessive backlash occurs when the cylindrical pins and locating dowels wear, allowing the 4657201012: HOUSING REAR PART to shift under load. Intermittent gear engagement or hard shifting can result from loose cap screws that allow internal components to drift out of specification. Vibration at specific RPM ranges is another common symptom, indicating that the loose parts securing the oil feed housing have fatigued.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4657.199.023 |
| Material Composition | Steel (hardened), Zinc-plated alloy |
| Weight (approx.) | 0.45 kg (1.0 lb) |
| Primary Function | Loose hardware kit for housing alignment |
| Included Fasteners | M8, M10 cap screws; cylindrical pins |
| Operating Torque Range | 25-45 Nm (dependent on fastener) |
| OEM Reference | ZF Friedrichshafen AG |
Compatibility
This genuine ZF 4657.199.023 LOOSE PARTS kit is engineered primarily for the WG 210 series transmission. Based on the part type and fastener configuration, it is also compatible with the WG 180 and WG 200 series models that share the same housing architecture. The kit is essential when replacing the 0631306792: CYLINDRICAL PIN or when servicing the oil feed passages. Always verify the transmission serial number against the OEM parts catalog before installation, as variations exist between early and late production units.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101033 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4657201027 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657201012 | HOUSING REAR PART | Rear section housing for output shaft |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | Fastener for housing sections |
| 4656301148 | FIXING PLATE | Retains internal bearing assemblies |
| 4657301032 | SCREEN SHEET | Filter mesh for oil sump |
| 4657301033 | SCREEN SHEET | Secondary filter mesh for oil return |
| 0636100803 | CAP SCREW | Fastener for oil pan attachment |
| 4681301040 | OIL FEED.HOUSG. | Distributes lubricant to gear mesh |
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