Overview
The ZF 5838.300.347 ORIFICE is a precision-engineered hydraulic flow control component designed to regulate oil pressure and volume within ZF heavy-duty transmission systems. This OEM genuine part sits within the valve body or hydraulic control circuit, where it meters transmission fluid to ensure proper clutch engagement and lubrication. The SKU 5838.300.347 is critical for maintaining consistent hydraulic pressure across the transmission’s internal passages, directly influencing shift quality and component longevity. When functioning correctly, this orifice prevents pressure spikes and ensures smooth power delivery in construction machinery applications.
Symptoms of Failure
- Erratic or delayed gear engagement – A worn or clogged 5838.300.347 orifice disrupts hydraulic timing, causing hesitation when shifting between forward and reverse gears.
- Transmission oil leaks at valve body – Deteriorated sealing surfaces around the orifice allow pressurized fluid to escape, leading to visible drips or puddles under the machine.
- Intermittent gear slipping under load – Inconsistent fluid metering results in insufficient clutch pack pressure, causing the transmission to slip during heavy excavation or grading operations.
- Harsh or jarring shifts – A blocked orifice prevents gradual pressure buildup, producing abrupt clutch engagements that stress driveline components.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 5838.300.347 |
| Material | Hardened steel with corrosion-resistant coating |
| Orifice Diameter | 2.5 mm (estimated) |
| Overall Length | 28 mm |
| Thread Size | M12 x 1.5 |
| Weight | 0.04 kg |
| OEM Reference | ZF 5838.300.347 |
Compatibility
This orifice is engineered for ZF power shift transmissions commonly used in construction machinery, including the WG180, WG200, and WG211 series. It also fits select 4WG-200 and 6WG-200 models. The part is installed in the hydraulic control manifold alongside the 5838109012: DIFFERENTIAL and the 0750117075: TAPER ROLLER BEARING. For complete driveline restoration, pair this orifice with the 2093209023: DIFFERENTIAL and the 5838300626: DIFFERENTIAL HOUSING to ensure proper oil flow and gear alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | DIFFERENTIAL | Distributes torque between axles |
| 0750117075 | TAPER ROLLER BEARING | Supports rotating shafts under load |
| 2093209023 | DIFFERENTIAL | Manages speed difference between wheels |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses differential gears |
| 0631329088 | SPRING PIN | Secures components in alignment |
| 5838300811 | THRUST WASHER | Reduces axial friction |
| 5838300721 | AXLE BEVEL GEAR | Transfers power at right angles |
| 5838300633 | AXLE | Transmits rotational force |
| 5838300753 | THRUST WASHER | Controls axial play |
| 5838300818 | THRUST WASHER | Prevents metal-to-metal contact |
Frequently Asked Questions
Q: How do I know if the 5838.300.347 orifice is clogged?
A: Check for delayed shift response or erratic clutch engagement. A pressure test at the valve body will confirm if the orifice is restricting flow.
Q: Can this orifice be cleaned and reused?
A: No. The precision-machined bore and hardened steel surface degrade over time. Always replace with an OEM genuine part to maintain exact hydraulic calibration.
Q: Does this part require special tools for installation?
A: A standard socket and torque wrench are sufficient. Ensure the sealing surface is clean and apply thread sealant if specified in the service manual.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
