Overview
The ZF 4108.322.050 SWASH PLATE is a critical hydraulic control component within the axial piston pump assembly of ZF powershift transmissions. This OEM genuine part precisely regulates fluid flow and pressure by converting the rotational motion of the drive shaft into the reciprocating action of the piston slippers. Located within the pump housing, the swash plate’s angled surface directly determines the pump’s displacement and, consequently, the transmission’s torque output. The SKU 4108.322.050 is manufactured to exacting ZF tolerances, ensuring consistent hydraulic response under heavy construction loads. For proper sealing and alignment, this swash plate interfaces directly with the 4108101068: HOUSING and the 4108201177: HOUSING, which contain the rotating group assembly.
Symptoms of Failure
- Erratic machine movement or gear slipping under load: A worn swash plate surface cannot maintain proper piston stroke, causing inconsistent hydraulic pressure and delayed clutch engagement.
- Metallic debris in transmission oil filter: Flaking or pitting on the swash plate’s hardened face releases microscopic metal particles into the hydraulic circuit, often accompanied by a whining pump noise.
- Reduced travel speed or loss of high-range gears: As the swash plate angle becomes compromised, the pump fails to deliver sufficient flow for higher gear ratios, forcing the machine to operate only in low range.
- External oil seepage near the pump housing joint: A distorted swash plate can stress the 0636302056: SCREW PLUG and the 4108301304: BEARING COVER, leading to seal failure and visible leaks around the transmission case.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4108.322.050 |
| OEM Reference | ZF 4108.322.050 |
| Material | Hardened alloy steel (ground surface) |
| Outer Diameter | ~120 mm (estimated) |
| Thickness | ~25 mm (estimated) |
| Weight | ~1.8 kg (4.0 lbs) |
| Surface Finish | Mirror-ground, Ra ≤ 0.2 µm |
| Operating Temperature Range | -20°C to +120°C |
Compatibility
This swash plate is engineered for ZF powershift transmissions commonly found in wheel loaders, graders, and dozers. It is a direct fit for the WG180, WG200, and WG211 series. The part also serves as a replacement in certain 4WG-180 and 4WG-200 variants used in construction machinery. Always verify the pump housing casting number; the 4108101068: HOUSING and 4108201177: HOUSING must be inspected for wear when replacing the swash plate.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101068 | HOUSING | Encloses the pump rotating group |
| 4108201177 | HOUSING | Rear pump housing section |
| 0636302056 | SCREW PLUG | Seals hydraulic ports |
| 4108301304 | BEARING COVER | Retains pump shaft bearing |
| 4108306173 | GASKET | Seals housing mating surfaces |
| 0750110040 | SHAFT SEAL | Prevents oil leakage at shaft |
| 0636302013 | SCREW PLUG | Drain or test port plug |
| 0501309567 | THERMOMETER | Monitors oil temperature |
| 4108338020 | ADAPTER | Connects pump to transmission |
| 4108111050 | POWER TAKE-OFF | Drives auxiliary hydraulic pumps |
