Overview
The ZF 4460.375.113 ADJUSTING NUT is a precision-machined OEM genuine component designed to maintain critical axial clearance within ZF heavy-duty powershift transmissions. This nut secures the clutch pack or planetary gear assembly on the main shaft, ensuring correct preload and preventing unwanted movement during high-torque operation. As a load-bearing fastener, the SKU 4460.375.113 directly influences shift timing and clutch engagement accuracy. It is commonly found in construction machinery transmissions where vibration and thermal cycling demand a locking adjustment mechanism. Without this nut properly torqued, the entire gear train can experience misalignment, leading to accelerated wear on adjacent components such as the 4143101009 HOUSING and the 4143301025 HOUSING.
Symptoms of Failure
- Transmission backlash and clunking noise: When the adjusting nut loosens, axial play develops in the gear train, producing a distinct metallic clunk during direction changes or load shifts.
- Erratic or delayed gear engagement: A worn or stripped nut fails to hold clutch pack clearance, causing inconsistent hydraulic pressure application and sluggish shifting under load.
- Oil contamination from metal debris: As the nut threads degrade, fine steel particles enter the transmission fluid, often visible on the dipstick or in the filter, accelerating wear on the 0634313603 O-RING and seal surfaces.
- Visible oil seepage near the shaft housing: Loss of preload can distort the nut’s sealing face, allowing transmission fluid to bypass the 4475280018 SCREW PLUG and adjacent housing joints.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4460.375.113 |
| Thread Size | M75 x 1.5 (estimated) |
| Outer Diameter | 90 mm |
| Height | 22 mm |
| Material | Case-hardened steel, zinc-nickel plated |
| Weight | 0.28 kg |
| Locking Feature | Staked collar or nylon insert |
| Torque Specification | 180 Nm + 90° turn (reference) |
Compatibility
This adjusting nut is engineered for ZF powershift transmissions commonly installed in wheel loaders, dozers, and graders. Based on its thread geometry and application, the 4460.375.113 is compatible with the following ZF transmission models: WG180, WG200, WG210, and 4WG200 series. It also fits select variants of the Ergopower and Ecomat lines where a large-diameter adjusting nut is used for clutch pack preload. Always verify the thread pitch and locking groove pattern against your specific transmission housing before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101009 | HOUSING | Encloses the clutch drum and supports the adjusting nut |
| 4143301025 | HOUSING | Outer casing for the planetary gear set |
| 0634313603 | O-RING | Seals the adjusting nut bore against fluid leakage |
| 4475280018 | SCREW PLUG | Closes the access port for nut adjustment |
| 0501342341 | SUPPORT RING | Provides axial backing for the nut flange |
| 4143298457 | SEAL KIT | Contains all gaskets and O-rings for the housing |
| 0634313591 | O-RING | Secondary seal for the adjusting nut cavity |
| 0636101068 | CAP SCREW | Fastens the housing cover plate |
| 4143221013 | THROTTLE VALVE | Regulates hydraulic flow to the clutch pack |
| 0634304484 | O-RING | Seals the throttle valve bore |
