Overview
The ZF 5838.300.050 IMPULSE GEAR is a precision-machined component designed for the internal geartrain of heavy-duty ZF WG series transmissions. This OEM genuine part functions as the primary speed-sensing gear, generating the rotational pulse signal required for electronic shift control and torque converter lock-up management. Positioned directly on the output shaft cluster, the impulse gear interfaces with the transmission speed sensor to provide real-time data to the vehicle’s ECU. The SKU 5838.300.050 is manufactured to exact ZF tolerances, ensuring consistent signal accuracy and long-term durability under high-torque conditions.
Symptoms of Failure
- Erratic shifting or delayed gear engagement: A worn or chipped impulse gear produces an inconsistent signal, causing the transmission control module to misinterpret output speed. This often results in harsh shifts or failure to upshift under load.
- Torque converter clutch shudder: When the 5838.300.050 loses tooth integrity, the speed sensor receives intermittent pulses, leading to unstable lock-up and a noticeable vibration during highway cruising.
- Transmission warning lamp illumination: Fault codes related to “output speed sensor signal implausible” or “gear ratio error” frequently trace back to a damaged impulse gear, especially in WG100, WG130, and WG131 units.
- Intermittent speedometer failure: Because the impulse gear drives the vehicle speed signal, a failing part can cause the speedometer to drop to zero or fluctuate randomly while driving.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 5838.300.050 |
| Product Type | Impulse Gear (Speed Sensing Gear) |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Outside Diameter | 68.5 mm |
| Inside Diameter (Bore) | 25.4 mm |
| Tooth Count | 24 teeth |
| Face Width | 18.2 mm |
| Weight | 0.32 kg |
| OEM Reference | ZF 5838.300.050 |
| Hardness | 58–62 HRC |
Compatibility
This genuine ZF impulse gear is engineered for the WG100, WG130, and WG131 transmission series. It is also compatible with select variants of the WG180 and WG200 models that share the same output shaft diameter and tooth geometry. Always verify your transmission model and serial number before installation. The 5838.300.050 is a direct replacement for earlier ZF part numbers 5838.300.048 and 5838.300.052.
During rebuild or repair, this impulse gear is commonly installed alongside the 5838109012 DIFFERENTIAL and the 0750117075 TAPER ROLLER BEARING. The 2093209023 DIFFERENTIAL and 5838300626 DIFFERENTIAL HOUSING are also critical mating components in the same assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | Differential | Distributes torque to axle shafts |
| 0750117075 | Taper Roller Bearing | Supports rotating shaft loads |
| 2093209023 | Differential | Torque distribution assembly |
| 5838300626 | Differential Housing | Encloses differential gears |
| 0631329088 | Spring Pin | Secures gear to shaft |
| 5838300811 | Thrust Washer | Reduces axial friction |
| 5838300721 | Axle Bevel Gear | Transfers power to axle |
| 5838300633 | Axle | Connects differential to wheels |
| 5838300753 | Thrust Washer | Wear surface for gear end-play |
| 5838300818 | Thrust Washer | Controls axial clearance |
Frequently Asked Questions
Q: Can the 5838.300.050 impulse gear be used in a ZF WG180 transmission?
A: Yes, it is compatible with WG180 models that share the same 25.4 mm bore and 24-tooth configuration. However, always cross-reference your transmission serial number to confirm fitment, as some early WG180 units used a different tooth profile.
Q: What tools are required to replace this impulse gear?
A: Replacement typically requires a bearing puller, snap ring pliers, and a torque wrench. The gear is press-fit onto the output shaft, so a shop press may be necessary for removal and installation. We recommend replacing the 0750117075 TAPER ROLLER BEARING simultaneously to ensure proper alignment.
Q: How can I verify if my impulse gear is causing speed sensor errors?
A: Inspect the gear teeth for chips, cracks, or uneven wear. Use a digital multimeter to check the speed sensor resistance and compare it to the manufacturer’s specification. A damaged 5838.300.050 will often produce a “P0722” or “P0723” fault code.
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ZF 5838.300.050 IMPULSE GEAR – Gear RFQ Support
Use ZF 5838.300.050 IMPULSE GEAR as the reference when requesting gear support. Photos, visible markings, and transmission context help reduce sourcing uncertainty.
Part-Number Summary
Use ZF number 5838.300.050 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: P.T.O. SHAFT
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 | 5838.300.050 |
|---|---|
| Normalized SKU | 5838300050 |
| Part name | IMPULSE GEAR |
| Product category | gear |
| 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.
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