Overview
The ZF 4642.199.773 LOOSE PARTS for WG201 is a critical sub-assembly kit designed to restore the internal integrity of your ZF WG 201 series transmission. This OEM genuine part set includes all necessary fasteners, seals, and positioning components that secure the valve body and hydraulic control unit within the main casing. When you order SKU 4642.199.773, you receive the exact loose hardware required to prevent internal fluid bypass and maintain precise gear engagement pressure. This kit is often replaced during a full overhaul alongside the 4644101160: TRANSMISSION HOUSING to ensure the entire assembly meets factory torque specifications.
Symptoms of Failure
When the 4642.199.773 LOOSE PARTS begin to degrade, operators typically notice three distinct failure modes. First, erratic shift timing occurs as loose fasteners allow the valve body to shift out of alignment, causing delayed or harsh gear changes. Second, low hydraulic pressure warnings appear on the dashboard display because the internal seals in this kit lose their compression, leading to fluid leakage past the control bores. Third, intermittent neutral engagement happens when the transmission unexpectedly drops out of gear under load, a direct result of the threaded bushings vibrating loose. Fourth, visible oil seepage around the transmission housing mating surfaces indicates the gaskets and O-rings in this kit have hardened and failed.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4642.199.773 |
| OEM Reference | ZF 4642.199.773 |
| Material Composition | Steel (fasteners), NBR (seals) |
| Weight | 0.85 kg (1.87 lbs) |
| Kit Contents | Bolts, washers, O-rings, threaded bushings |
| Torque Specification | 25 Nm (18.4 ft-lbs) for M8 fasteners |
| Operating Temperature Range | -40°C to +120°C (-40°F to +248°F) |
Compatibility
This LOOSE PARTS kit is engineered specifically for the ZF WG 201 series, but it also fits the WG180, WG200, and WG211 models due to shared valve body mounting patterns. It is not compatible with the WG120 or WG150 series. When installing, always pair this kit with a new 4644301323: TRANSMISSION HOUSING if the original housing shows wear at the bolt holes. Additionally, the 4644301189: THREADED BUSH included in this set must be torqued precisely to avoid stripping the aluminum housing. For final sealing, use the 4475280043: SCREW PLUG to close any unused ports after assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301323 | TRANSMISSION HOUSING | Alternate housing variant for WG201 |
| 4644301189 | THREADED BUSH | Inserts for bolt hole reinforcement |
| 4475280043 | SCREW PLUG | Seals unused hydraulic ports |
| 0634306198 | O-RING | Static seal for housing joints |
| 0730365067 | TYPE PLATE | Identification tag for transmission model |
| 4644301161 | COVER PLATE | Protects valve body access opening |
| 0636100621 | HEXAGON SCREW | Fastener for cover plate mounting |
| 0631610020 | SET SCREW | Adjustable stop for shift linkage |
| 0501218540 | BREATHER | Pressure equalization vent |
