Overview
The ZF 5838.300.309 OUTER CLUTCH DISK is a precision-engineered friction component designed for the WG100, WG130, and WG131 transmission series. This OEM genuine part sits within the clutch pack assembly, where it engages and disengages torque flow between planetary gear sets. The outer clutch disk features a splined outer diameter that locks into the clutch drum, while its friction lining interfaces with steel separator plates to transfer power smoothly under load. As a critical wear item, the SKU 5838.300.309 ensures consistent hydraulic pressure modulation and prevents power loss during gear shifts. For optimal drivetrain integrity, this disk works in concert with the 5838022003: REAR AXLE and the 5838109001: DIFFERENTIAL to maintain balanced torque distribution across the axle assembly.
Symptoms of Failure
- Delayed or harsh gear engagement: When the outer clutch disk wears thin, hydraulic pressure cannot fully clamp the pack, causing a noticeable lag or jarring shift when moving from neutral to drive or reverse.
- Transmission slipping under load: Worn friction material on the 5838.300.309 allows the clutch pack to slip during acceleration, especially on inclines or when towing, leading to RPM flare without corresponding vehicle speed increase.
- Burning smell or dark transmission fluid: Excessive heat from slipping friction surfaces degrades the ATF, producing a distinct burnt odor and discolored fluid that indicates imminent clutch failure.
- Loss of power in specific gears: A failed outer disk in a particular clutch pack will cause that gear range to lose torque transmission, often accompanied by unusual vibration from the 5838300128: DIFFERENTIAL HOUSING.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 5838.300.309 |
| OEM Reference | ZF 5838.300.309 |
| Outer Diameter | 180 mm (approx.) |
| Inner Diameter (spline) | 120 mm (approx.) |
| Thickness (new) | 3.5 mm |
| Material | High-carbon steel core with sintered bronze friction lining |
| Weight | 0.45 kg |
| Friction Coefficient | 0.12 – 0.14 (wet) |
| Compatible Fluid | ZF TE-ML 03 or 04 approved ATF |
Compatibility
This outer clutch disk is engineered for ZF WG-series transmissions, specifically the WG100, WG130, and WG131 models. These transmissions are commonly found in medium-duty trucks, buses, and off-highway equipment. The 5838.300.309 also fits select variants of the WG180 and WG200 series when used in conjunction with the correct clutch pack configuration. Always verify spline count and stack height against your transmission’s service manual. For axle-side integration, the 0750117075: TAPER ROLLER BEARING supports the differential carrier that mates to this clutch assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838022003 | REAR AXLE | Transmits torque from differential to wheel hubs |
| 5838109001 | DIFFERENTIAL | Distributes torque between left and right wheels |
| 0750117075 | TAPER ROLLER BEARING | Supports axial and radial loads on differential shafts |
| 5838300128 | DIFFERENTIAL HOUSING | Encloses and protects differential gears |
| 0631329086 | SPRING PIN | Secures clutch pack alignment dowels |
| 5838300129 | THRUST WASHER | Reduces axial friction between rotating clutch components |
| 5838300130 | THRUST WASHER | Secondary axial wear surface for clutch hub |
| 5838300131 | AXLE BEVEL GEAR | Transfers rotational force from differential to axle shafts |
| 5838300132 | COMPENS. STUB AXLE | Compensates for axle length variations |
| 5838300133 | COMPENS. STUB AXLE | Alternate compensation stub for different axle configurations |
ZF 5838.300.309 OUTER CLUTCH DISK – Clutch Disk RFQ Support
Use ZF 5838.300.309 OUTER CLUTCH DISK when preparing clutch-pack sourcing requests. PartsZF can review the number, related parts, and documentation requirements before quotation.
Part-Number Summary
Use ZF number 5838.300.309 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
This clutch disk supports clutch pack service and friction component sourcing for ZF transmissions. Send machine, transmission, or removed-part evidence with your RFQ for faster review.
Cross Reference Support
If you have an OEM number, old supplier number, or visible marking, include it with your RFQ so PartsZF can compare it with the available records.
Specification Snapshot
| ZF part number | 5838.300.309 |
|---|---|
| Normalized SKU | 5838300309 |
| Part name | OUTER CLUTCH DISK |
| Product category | clutch disk |
| RFQ support | Part-number lookup and documentation review |
| Media support | Product photo or diagram review when available |
Image and Documentation Notes
Current product media status: fallback. Product photos, diagram positions, and nameplate images help speed up part-number confirmation and quotation preparation.
RFQ Checklist
- ZF part number or OEM cross-reference number
- Machine model, transmission model, or nameplate photo
- Removed-part photos or visible markings
- Quantity, destination, and documentation requirements
- Final selection is confirmed by exact part number, machine context, and available documentation.
Related Parts
- ZF 5838.300.306 INNER CLUTCH DISK
- ZF 5838.300.307 OUTER CLUTCH DISK
- ZF 0501.342.428 OUTER CLUTCH DISK
- ZF 0501.342.427 INNER CLUTCH DISK
- ZF 0501.216.833 LINED CLUTCH DISK
