Overview
The ZF 1211.304.027 SHIM is a precision-engineered adjustment component designed for the WG150 series transmission. This OEM genuine part, identified by SKU 1211.304.027, functions as a critical spacer within the planetary gearset assembly, ensuring correct axial clearance between rotating and stationary elements. By maintaining exact tolerances, this shim prevents unwanted gear movement and distributes load evenly across the transmission housing. It is typically installed during rebuilds or repairs alongside the TRANSMISSION HOUSING and TRANSMISSION HOUSING to restore factory-specified clearances.
Symptoms of Failure
- Excessive axial play in the output shaft: When the shim wears or compresses beyond tolerance, you may detect noticeable end-play when rotating the driveshaft by hand, leading to premature bearing wear.
- Low-frequency gear whine under load: A worn 1211.304.027 shim allows gear faces to misalign, producing a distinct humming or whining noise during acceleration, often misdiagnosed as a bearing issue.
- Intermittent gear slipping in forward ranges: Insufficient shim thickness reduces clutch pack clamping force, causing momentary power loss or hesitation when shifting under heavy torque.
- Metallic debris in transmission fluid: As the shim deteriorates, microscopic steel particles contaminate the oil, often visible during routine drain intervals or when inspecting the SEALING CAP area.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 1211.304.027 |
| Material | Case-hardened spring steel (C67S) |
| Outer Diameter | 68.0 mm |
| Inner Diameter | 52.5 mm |
| Thickness | 0.27 mm |
| Weight | 8.2 grams |
| OEM Reference | ZF 1211.304.027 |
| Surface Finish | Ground, deburred edges |
Compatibility
This shim is specifically calibrated for the ZF WG150 series transmission, but it also fits select models in the WG180 and WG200 families where identical planetary gearset clearances are specified. It is commonly used in off-highway vehicles, forklifts, and industrial loaders. Always verify clearance requirements using the TYPE PLATE affixed to your transmission housing. For secure mounting, pair this shim with a GROOVED STUD to prevent rotation during assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101108 | TRANSMISSION HOUSING | Main structural casing for gearset |
| 4642301208 | TRANSMISSION HOUSING | Secondary housing for clutch pack |
| 0730365125 | TYPE PLATE | Identification plate with model specs |
| 0631311009 | GROOVED STUD | Alignment pin for shim positioning |
| 4642301168 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4642301169 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636100621 | HEXAGON SCREW | Fastener for housing assembly |
| 0630361029 | SEALING CAP | Port seal for pressure testing |
| 4642306254 | ADAPTER | Converter-to-housing interface |
| 0634303340 | O-RING | Hydraulic seal for adapter joint |
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