Overview
The ZF 4108.111.051 POWER TAKE-OFF is a critical OEM genuine component engineered to transfer engine torque to auxiliary hydraulic systems in heavy-duty construction machinery. Mounted directly to the transmission housing, this PTO unit engages via a pneumatic or mechanical shift mechanism, enabling operators to power pumps, winches, or compressors without interrupting the vehicle’s primary driveline. As an original ZF part, the SKU 4108.111.051 guarantees precise gear meshing and oil flow integrity within the transmission assembly. For proper sealing and structural support, this unit is often installed alongside the 4108101057: HOUSING and the 4108201177: HOUSING, which together form the rigid casing that protects internal gears from debris and pressure loss.
Symptoms of Failure
- Hydraulic system pressure drop or sluggish implement response — When the PTO gear teeth wear or the shift fork binds, the unit fails to transmit full torque, causing noticeable lag in crane or excavator functions.
- Oil seepage around the PTO mounting flange — A degraded gasket or cracked housing allows transmission fluid to escape, often visible as drips beneath the vehicle after shutdown.
- Grinding or whining noise during PTO engagement — Worn bearings or insufficient lubrication from a failing 0636302056: SCREW PLUG can produce metallic sounds that worsen under load.
- Intermittent PTO disengagement under vibration — A loose shift mechanism or damaged detent spring causes the PTO to slip out of gear, halting auxiliary operations unexpectedly.
Technical Specifications
| Part Number | 4108.111.051 |
| Type | Power Take-Off (PTO), flange-mounted |
| Material | High-tensile cast iron housing with hardened steel gears |
| Weight | Approx. 14.5 kg (32 lbs) |
| Input Speed | Up to 2,500 RPM |
| Torque Capacity | 600 Nm (442 lb-ft) |
| Mounting Bolt Pattern | 6-bolt SAE “B” pattern |
| OEM Reference | ZF 4108.111.051 |
| Seal Type | Lip seal with integrated dust lip |
Compatibility
This genuine ZF power take-off is designed for use in the WG180, WG200, and WG210 series transmissions commonly found in wheel loaders, graders, and mobile cranes. It also fits select Ecomat 4HP and 5HP models where a side-mounted PTO port is present. Always verify the housing alignment using the 4108301304: BEARING COVER to ensure correct shaft support and oil circulation. For complete sealing, pair this PTO with the 4108306173: GASKET and 0750110040: SHAFT SEAL to prevent contamination and fluid loss.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101057 | HOUSING | Encloses the PTO gear set and supports input shaft |
| 4108201177 | HOUSING | Secondary housing for shift mechanism and oil passages |
| 0636302056 | SCREW PLUG | Seals oil fill/drain port; prevents leakage |
| 4108301304 | BEARING COVER | Retains output bearing and preload adjustment |
| 4108306173 | GASKET | Provides leak-proof seal between housing flanges |
| 0750110040 | SHAFT SEAL | Prevents oil escape along the rotating shaft |
| 0730106757 | WASHER | Spacer for gear alignment |
| 0730106758 | WASHER | Thrust washer for axial load distribution |
| 0730106759 | WASHER | Lock washer for fastener retention |
| 0730106760 | WASHER | Flat washer for bolt torque consistency |
