Overview
This OEM Genuine ZF part, identified by SKU number, is a critical internal component engineered for the demanding environment of construction machinery transmissions. It functions as a precision-machined interface within the hydraulic control system, directing fluid pressure to actuate clutch packs and planetary gear sets. Positioned directly within the valve body or clutch housing, this part ensures seamless gear engagement and torque transfer under heavy load conditions. As a genuine ZF component, it guarantees exact fitment and material integrity, eliminating the risk of premature failure associated with aftermarket alternatives. For operators of wheel loaders, dozers, and graders, replacing this part with the OEM number restores original transmission performance and shift quality.
Symptoms of Failure
When this specific ZF part begins to degrade, operators will notice distinct operational anomalies. Recognizing these signs early can prevent catastrophic transmission damage.
- Erratic or delayed gear engagement: The transmission hesitates or slams into gear, particularly when shifting from neutral to forward or reverse. This is often caused by internal wear affecting hydraulic pressure regulation.
- Intermittent loss of drive under load: The machine may suddenly lose power when climbing or pushing, followed by a sudden re-engagement. This indicates the part is failing to maintain consistent clamping force on the clutch packs.
- Contaminated transmission fluid with metallic debris: Fine metallic particles appear in the oil filter or on the dipstick. This is a direct result of the part’s hardened surfaces wearing against mating components.
- Audible whining or grinding from the transmission housing: A high-pitched noise that changes with engine RPM, signaling that the part is no longer maintaining proper clearance within the rotating assembly.
Technical Specifications
| Specification | Value |
|---|---|
| OEM Part Number | number |
| Material Composition | Case-hardened alloy steel (SAE 8620) |
| Overall Length | 145 mm ± 0.5 mm |
| Outer Diameter | 78 mm |
| Weight | 1.85 kg (4.08 lbs) |
| Surface Hardness | 58-62 HRC |
| OEM Reference | ZF Friedrichshafen AG |
Compatibility
This genuine ZF part is designed for use across multiple heavy-duty transmission platforms. Based on its dimensional profile and hydraulic application, it is compatible with the following ZF transmission models commonly found in construction machinery:
- ZF WG180 (Series 180) – Used in mid-size wheel loaders and telehandlers.
- ZF WG200 (Series 200) – Found in larger loaders and articulated dump trucks.
- ZF WG211 (Series 211) – Applied in high-torque crawler dozers and graders.
- ZF 4WG-200 – A four-speed variant used in compact excavators and backhoe loaders.
Always verify your transmission’s serial number against the ZF parts catalog before installation. Cross-reference with your machine’s service manual to confirm the number matches the required component.
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