Overview
The ZF 0501.326.294 NOZZLE is a precision-engineered fluid metering component designed for the hydraulic control circuits within ZF heavy-duty transmissions. Positioned within the valve body assembly, this OEM genuine part regulates oil flow to specific clutch packs and lubrication channels, ensuring consistent pressure delivery during gear shifts. The SKU 0501.326.294 is manufactured to exact ZF tolerances, making it critical for maintaining shift quality and thermal management in construction machinery transmissions.
Symptoms of Failure
- Delayed or harsh shifting under load: When the nozzle wears or becomes clogged, hydraulic pressure drops, causing sluggish engagement in forward or reverse gears.
- Intermittent transmission overheating: Restricted oil flow through the nozzle reduces lubrication to planetary gearsets, leading to elevated operating temperatures during extended operation.
- Erratic clutch engagement on inclines: A failing nozzle causes pressure fluctuations that result in slipping clutches when the machine is under heavy load on grades.
- Oil contamination in the valve body area: Worn nozzle edges allow debris to bypass filtration, leading to premature wear of adjacent components like the 4663101001 HOUSING.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0501.326.294 |
| Material | Hardened alloy steel (C45E + nitrided) |
| Orifice Diameter | 2.8 mm ±0.05 mm |
| Overall Length | 34.5 mm |
| Hex Size | 12 mm (AF) |
| Weight | 0.018 kg |
| OEM Reference | ZF 0501.326.294 |
| Thread Type | M10 x 1.0 (fine pitch) |
Compatibility
This nozzle is primarily used in ZF WG180, WG200, and WG211 series powershift transmissions found in wheel loaders, graders, and excavators. It also appears in select ZF Ecomat 4HP and 5HP models used in construction machinery. The 0501.326.294 interfaces directly with the 4663301025 COVER and is secured using the 0636100817 CAP SCREW. For proper alignment during installation, the 0631306816 CYLINDRICAL PIN must be correctly seated in the housing bore.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4663101001 | HOUSING | Encloses valve body and nozzle assembly |
| 4663301025 | COVER | Seals the nozzle cavity and maintains pressure |
| 0631306816 | CYLINDRICAL PIN | Aligns nozzle orientation during assembly |
| 0636100817 | CAP SCREW | Secures cover to housing |
| 4656301148 | FIXING PLATE | Retains nozzle in position |
| 0636611009 | STUD | Provides threaded mounting point |
| 0634303928 | O-RING | Seals nozzle-to-housing interface |
| 4475280099 | SCREW PLUG | Closes unused hydraulic ports |
| 0634303266 | O-RING | Seals screw plug |
| 4475280018 | SCREW PLUG | Alternate port closure |
