Overview
The ZF 4108.042.010 PK 4200 is an OEM genuine part designed for the internal power take-off (PTO) assembly within heavy-duty construction machinery transmissions. This component serves as the primary drive gear for auxiliary hydraulic pumps, transferring engine torque from the transmission’s main shaft to external equipment. The SKU 4108.042.010 is a precision-machined gear that sits directly inside the PTO housing, engaging with the countershaft to deliver consistent power output. It is manufactured to ZF’s original specifications, ensuring exact fitment and load-bearing capacity for demanding off-highway applications. This part is often replaced in conjunction with the 4108101031: HOUSING and 4108303155: HOUSING, which encase the gear assembly and protect it from debris.
Symptoms of Failure
- Hydraulic pump whining or erratic operation: When the 4108.042.010 gear wears, it produces uneven torque transfer, causing the connected pump to emit high-pitched noises or surge during operation.
- Oil leaks from the PTO housing: A worn gear can create excessive vibration, loosening the 0636302015: SCREW PLUG and 0630361037: SEALING CAP, leading to transmission fluid seepage.
- Intermittent power loss to auxiliary equipment: Damaged gear teeth cause the PTO to slip under load, resulting in sudden drops in hydraulic pressure during digging or lifting cycles.
- Metallic debris in transmission oil: Flaking or chipped gear surfaces contaminate the lubricant, often detected during routine oil changes or filter inspections.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4108.042.010 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Weight | 1.85 kg (4.08 lbs) |
| Outer Diameter | 98.5 mm |
| Tooth Count | 22 teeth, helical cut |
| OEM Reference | ZF PK 4200 series |
| Torque Capacity | 420 Nm (310 ft-lbs) continuous |
Compatibility
This genuine ZF 4108.042.010 gear is compatible with the following ZF transmission models that utilize a PK 4200 PTO module: WG180, WG200, WG211, and WG310. It is also used in select Ecomat 4HP and 6HP series transmissions equipped with auxiliary drive options. Always verify the PTO housing casting number—this gear pairs directly with the 4108108019: INTERM.GEARBOX assembly. For sealing integrity, replace the 0634801165: SEALING RING and 0736305007: SCREW PLUG during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101031 | HOUSING | Encloses the PTO gear assembly |
| 4108303155 | HOUSING | Secondary housing for PTO shaft support |
| 0636302015 | SCREW PLUG | Seals oil passages in the housing |
| 0630361037 | SEALING CAP | Prevents debris ingress at housing ports |
| 0730361010 | SEALING CAP | Alternate cap for high-pressure ports |
| 0736305007 | SCREW PLUG | Magnetic plug for ferrous debris capture |
| 0634801165 | SEALING RING | O-ring for housing-to-gear interface |
| 0730365280 | TYPE PLATE | Identification plate for PTO module |
| 0631311009 | GROOVED STUD | Alignment dowel for housing mounting |
| 4108108019 | INTERM.GEARBOX | Intermediate gearbox for PTO speed reduction |
