Overview
The ZF 4644.199.474 LOOSE PARTS kit is a critical service component designed specifically for the WG 180 Series transmission. This genuine OEM assembly contains the essential loose hardware and small fittings required to secure and seal internal transmission elements during rebuilds or major repairs. Identified by SKU 4644.199.474, this kit ensures that every fastener, clip, and spacer meets ZF’s exacting tolerances, preventing premature wear and maintaining hydraulic integrity. When paired with a replacement TRANSMISSION HOUSING (4644101249) or a TRANSMISSION HOUSING (4644301402), this loose parts set guarantees a complete and reliable reassembly.
Symptoms of Failure
When the components within the 4644.199.474 kit degrade or are lost during service, operators may notice specific transmission issues. Look for these failure indicators:
- Oil seepage at housing joints: Worn or missing fasteners from this kit can cause uneven clamping pressure, leading to fluid leaks around the COVER PLATE (4644301298).
- Intermittent gear engagement: Loose internal hardware may allow shift components to shift out of alignment, resulting in delayed or erratic gear changes.
- Vibration during torque converter lockup: Degraded spacers or clips can create play in the driveline, producing low-frequency vibrations under load.
- Contamination from loose debris: Broken or missing retaining parts can shed metal fragments into the oil circuit, accelerating wear on valves and clutches.
Technical Specifications
| Specification | Value |
|---|---|
| OEM Part Number | 4644.199.474 |
| Material Composition | Steel alloy with zinc-nickel plating |
| Weight (estimated) | 0.85 kg (1.87 lbs) |
| Kit Contents | Bolts, washers, clips, retaining rings |
| Operating Temperature Range | -40°C to +120°C |
| OEM Reference | ZF WG 180 Service Kit |
Compatibility
This genuine ZF loose parts kit is engineered for the WG 180 transmission series, but its fasteners and hardware are also shared with the WG 200 and select WG 160 variants. It is commonly used in municipal trucks, construction loaders, and agricultural tractors. For optimal sealing, always replace the O-RING (0634306323) simultaneously. Additional related components include the SCREW PLUG (0636305026) for drain ports and the SCREEN SHEET (4644301279) for filtration integrity.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101249 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301402 | TRANSMISSION HOUSING | Alternate housing variant for WG180 |
| 4644301298 | COVER PLATE | Seals the valve body access port |
| 0634306323 | O-RING | Hydraulic seal for housing interfaces |
| 0636305026 | SCREW PLUG | Closes oil drain and fill holes |
| 4644301279 | SCREEN SHEET | Filters debris from hydraulic fluid |
| 4644301088 | SEALING CAP | Protects exposed ports during service |
| 4644159347 | SHIFT SYSTEM | Controls gear selection mechanism |
| 4475280036 | SCREW-IN SLEEVE | Provides threaded insert for housing |
| 4644306511 | GEAR SHIFT HOUSING | Encloses shift fork assembly |
