Overview
This OEM Genuine ZF 4108.302.007 BEARINGSHEET is a critical wear component designed to maintain precise axial clearance and load distribution within the planetary gear sets of ZF WG-series transmissions. Positioned between the sun gear and the carrier assembly, this bearing sheet reduces friction and prevents metal-to-metal contact during high-torque operation. The SKU 4108.302.007 is engineered to exact OEM tolerances, ensuring consistent oil film retention and long service life in heavy-duty industrial drivetrains.
Symptoms of Failure
- Abnormal gear whine or grinding noise during acceleration: When the bearing sheet wears thin, gear mesh clearance increases, producing a distinct metallic sound under load.
- Intermittent gear slipping or delayed engagement: Worn axial play allows the planetary gears to shift out of alignment, causing momentary power loss.
- Dark metallic debris in transmission oil: Flaking bearing material contaminates the fluid, often visible during oil changes or when inspecting the OIL LEVEL GAGE.
- Overheating near the transmission housing: Increased friction from a degraded bearing sheet generates excess heat, which can warp the TRANSMISSION HOUSING over time.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 4108.302.007 |
| Material | Case-hardened steel with phosphate coating |
| Outer Diameter | 112 mm |
| Inner Diameter | 68 mm |
| Thickness | 2.5 mm |
| Weight | 0.18 kg |
| OEM Reference | ZF 4108.302.007 |
Compatibility
This bearing sheet is specifically engineered for ZF WG100, WG130, and WG131 transmission models. It also fits select WG180 and WG200 variants where the planetary carrier assembly uses the same axial thrust configuration. Always verify clearance against the HOUSING and the SCREW PLUG sealing surface during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101128 | TRANSMISSION HOUSING | Encloses gear train and supports bearing loads |
| 4108201296 | HOUSING | Secondary housing for clutch pack assembly |
| 4475280018 | SCREW PLUG | Seals oil passages in the valve body |
| 0501215601 | OIL LEVEL GAGE | Monitors transmission fluid level |
| 4108303034 | COVER | Protects rear bearing cavity from contamination |
| 0636015120 | HEXAGON SCREW | Secures bearing cover to housing |
| 0636302015 | SCREW PLUG | Closes oil drain port |
| 0501325471 | SEALING RING | Prevents oil leaks at shaft interfaces |
| 0730365280 | TYPE PLATE | Identifies transmission model and serial number |
| 4108108026 | INTERM.GEARBOX | Intermediate gearbox for power take-off |
Frequently Asked Questions
Q: Can I reuse the old bearing sheet if it looks clean?
A: No. The bearing sheet is a single-use crush washer that deforms during initial torque. Reusing it will cause incorrect axial play and rapid gear wear.
Q: Does this part require special tools for installation?
A: Yes. You will need a torque wrench calibrated to the ZF specification (typically 45 Nm for the retaining screws) and a dial indicator to verify end float after assembly.
Q: How often should the bearing sheet be replaced?
A: ZF recommends replacement every major overhaul (approximately 10,000 operating hours) or whenever the transmission is disassembled for clutch or seal service.
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