ZF 4681.298.021 REPAIR KIT for BP210/BP230/WG210 | OEM Genuine Part

Overview

This OEM Genuine ZF 4681.298.021 REPAIR KIT is a critical service component engineered specifically for the BP210, BP230, and WG210 series transmissions. Designed to restore sealing integrity and hydraulic pressure within the clutch pack assembly, this kit contains all necessary gaskets, seals, and O-rings required for a complete overhaul of the valve body and piston housing. The SKU 4681.298.021 is the factory-specified replacement for worn-out sealing elements, ensuring that your transmission maintains precise shift timing and prevents cross-contamination between hydraulic circuits. When installed alongside a TRANSMISSION HOUSING, this repair kit guarantees a leak-free interface between the main casing and the internal hydraulic control unit.

Symptoms of Failure

• Delayed or harsh gear engagement: When the sealing elements inside the repair kit degrade, hydraulic pressure bleeds off, causing a noticeable lag when shifting from Neutral to Drive or Reverse. This is often described as a “ZF transmission shift flare” or “BP210 slipping under load.”
• External oil seepage around the valve body cover: Worn gaskets allow transmission fluid to escape, leaving visible drips on the bell housing or under the vehicle. This is a classic “ZF WG210 oil leak from the side cover” symptom.
• Erratic shift quality during temperature changes: As the seals harden with age, the transmission may shift smoothly when cold but exhibit harsh engagements after reaching operating temperature. This “hot shift shudder” is a direct indicator that the 4681.298.021 kit needs replacement.
• Low line pressure warnings: Internal seal failure reduces pump output pressure, often triggering diagnostic trouble codes (DTCs) related to “pressure control solenoid performance” in BP230 series units.

Technical Specifications

Compatibility

This repair kit is engineered for the ZF BP210, BP230, and WG210 series transmissions. It is also compatible with the WG180 and WG200 models when used in conjunction with the correct TRANSMISSION HOUSING variant. The kit fits all production years of these series, including the BP210A, BP230B, and WG210C sub-variants. For optimal sealing performance, always replace the HOUS.FRONT SECT and HOUSING REAR PART simultaneously if they show signs of corrosion or pitting on the sealing surfaces.

Related Components

Frequently Asked Questions

Q: Can I use this repair kit on a ZF WG180 transmission?
A: Yes, the 4681.298.021 kit is compatible with WG180 models, provided you also inspect and replace the HOUSING REAR SECTION if it shows wear. The sealing profiles are identical across the BP210/WG210 family.

Q: How often should this repair kit be replaced?
A: ZF recommends replacing the seals and gaskets in this kit every 500,000 miles or during any major transmission overhaul. Symptoms like fluid leaks or slipping typically appear after 400,000 miles in heavy-duty applications.

Q: Does this kit include the cap screws for the valve body?
A: No, the kit contains only sealing elements. You will need to order CAP SCREW (0636100801) and CAP SCREW (0636100803) separately for a complete rebuild.