Overview
The ZF 4681.301.031 OIL TUBE is a precision-engineered fluid conduit designed for the BP210, BP230, WG190, and WG210 series transmissions. This OEM genuine part channels pressurized hydraulic oil from the pump to the valve body and clutch packs, ensuring consistent lubrication and cooling within the rotating assembly. As a critical component of the lubrication circuit, the SKU 4681.301.031 sits directly inside the main casing, routing oil past the TRANSMISSION HOUSING and into the front section. Without this tube, the transmission cannot maintain proper hydraulic pressure, leading to rapid component wear.
Symptoms of Failure
- Visible oil leaks around the bell housing: A cracked or corroded 4681.301.031 tube often causes fluid to weep from the joint between the HOUS.FRONT SECT and the main case, leaving puddles under the vehicle.
- Intermittent gear slipping under load: When the oil tube develops internal blockages or fractures, hydraulic pressure drops, causing clutches to slip during acceleration or hill climbs.
- Overheating transmission fluid: A restricted oil tube reduces flow to the cooler circuit, resulting in fluid temperatures exceeding 120°C (248°F) during normal operation.
- Delayed engagement from Park to Drive: Low oil volume reaching the valve body due to a compromised tube creates a 2-3 second lag before gears engage.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4681.301.031 |
| Material | Seamless steel tube, zinc-nickel plated |
| Length | 312 mm (12.28 in) |
| Outer Diameter | 14 mm (0.55 in) |
| Wall Thickness | 1.5 mm (0.059 in) |
| Weight | 0.18 kg (0.40 lb) |
| OEM Reference | ZF 4681.301.031 |
| Thread Type | M12 x 1.5 (both ends) |
Compatibility
This oil tube is engineered for ZF’s heavy-duty powershift transmissions. It fits the BP210, BP230, WG190, and WG210 series. Additionally, it is compatible with the WG180 and WG200 models when used with the appropriate HOUSING REAR PART and HOUSING REAR SECTION. Always verify your transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101088 | TRANSMISSION HOUSING | Encloses the gear train and oil tube assembly |
| 4657201183 | HOUS.FRONT SECT | Front section housing the pump and oil tube inlet |
| 4657201184 | HOUSING REAR PART | Rear housing supporting the output shaft |
| 4657298111 | HOUSING REAR SECTION | Intermediate rear casing for extended transmissions |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing sections |
| 0636100801 | CAP SCREW | M10 fastener for oil tube bracket |
| 4681301015 | FIXING PLATE | Secures the oil tube to the housing |
| 4681301016 | SCREEN SHEET | Fine mesh filter for oil inlet |
| 4681301017 | SCREEN SHEET | Coarse mesh pre-filter for pump suction |
| 0636100803 | CAP SCREW | M12 bolt for rear housing attachment |
Frequently Asked Questions
Q: Can I install the 4681.301.031 oil tube without removing the transmission?
A: In most BP210 and WG190 applications, the oil tube can be replaced by dropping the pan and removing the valve body. However, on WG210 models with a rear PTO, the HOUSING REAR SECTION must be unbolted for access.
Q: What torque should I apply to the oil tube fittings?
A: Tighten the M12 x 1.5 fittings to 35 Nm (26 lb-ft). Over-torquing can crack the tube or damage the HOUS.FRONT SECT threads.
Q: Does this part come with sealing O-rings?
A: No, the 4681.301.031 is supplied as a bare tube. You must order separate O-rings (size 18×2.5 mm) and the FIXING PLATE to complete the installation.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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