Overview
The ZF 4660.201.008 SCREW PLUG is a precision-engineered sealing component designed for the lubrication and hydraulic circuits within ZF WG200, WG92, and related off-highway transmission series. This OEM genuine part functions as a threaded closure point on the transmission housing or valve body, preventing fluid contamination and maintaining critical oil pressure. The SKU 4660.201.008 is typically located on the lower pan or side cover of the gearbox, providing a secure seal against high-temperature transmission fluid. When installed alongside the 4660198001 PERIPHERALS kit, it ensures the entire hydraulic loop remains leak-free under heavy load conditions.
Symptoms of Failure
- Visible oil seepage around the transmission pan: A worn or cross-threaded 4660.201.008 screw plug often causes slow, persistent ATF leaks that pool on the bell housing or ground.
- Erratic gear engagement or delayed shifting: When this plug loses its seal, air ingression into the hydraulic circuit leads to pressure loss, causing the 0501209818 RANGE SELECTOR to struggle with clutch pack actuation.
- Low fluid level warnings without visible puddles: A compromised screw plug can allow fluid to weep during operation, leading to gradual oil starvation that affects the 4660101011 TRANSMISSION HOUSING integrity.
- Contaminated fluid with metallic debris: If the plug loosens internally, it can allow debris to bypass the filter, accelerating wear on the 4660301018 HOUSING assembly.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4660.201.008 |
| Thread Size | M18 x 1.5 (estimated) |
| Overall Length | 22 mm |
| Hex Head Size | 17 mm (AF) |
| Material | Carbon steel, zinc-plated |
| Weight | 0.04 kg (0.09 lbs) |
| OEM Reference | ZF 4660.201.008 |
| Seal Type | Copper washer (included) |
Compatibility
This genuine ZF screw plug is engineered for the following transmission model families: WG 200 Series, WG 90 Series, WG 92 Series, WG 94 Series, and WG 98 Series. It is a direct replacement for the drain or fill plug on WG180, WG200, and WG92 gearboxes used in agricultural tractors, construction loaders, and industrial material handlers. Always verify thread pitch against your existing 4660101011 TRANSMISSION HOUSING before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660198001 | PERIPHERALS | Hydraulic circuit kit for valve body |
| 0501209818 | RANGE SELECTOR | Controls clutch pack engagement |
| 4660101011 | TRANSMISSION HOUSING | Main structural casing |
| 4660301018 | HOUSING | Torque converter housing section |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing |
| 0769123894 | TYPE PLATE | Identification label |
| 4660221012 | SUCTION TUBE | Oil pickup from pan |
| 0634100317 | O-RING | Seal for hydraulic ports |
| 0636103273 | CAP SCREW | Fastener for valve body |
| 0750100022 | SCREW PLUG | Alternate drain plug variant |
