ZF 0634.100.317 O-RING for WG200/WG92/WG98 | OEM Genuine Part

Genuine ZF O-RING (Part No. 0634.100.317). This part fits: 4 WG 92, 4 WG 98, 4 WG 98 PS, 6 WG 200(555/3), WG 92 and 2 more models. Found in: Transmission Housing. Also referenced as: 0634100317 / 0634.100.317 / 0634 100 317.

Overview

The ZF 0634.100.317 O-RING is a critical sealing component engineered for high-pressure hydraulic circuits within the WG200, WG92, and WG98 transmission series. This OEM genuine part, identified by SKU 0634.100.317, sits at the interface between the valve body and the TRANSMISSION HOUSING, preventing fluid bypass and maintaining system pressure. Without this precise elastomeric seal, the transmission cannot sustain the hydraulic integrity required for clutch engagement and torque converter lockup. The O-ring is manufactured to ZF’s exacting material specifications, ensuring resistance to ATF degradation and thermal cycling common in heavy-duty industrial applications.

Symptoms of Failure

  • External oil seepage at housing joints – A worn 0634.100.317 O-ring often manifests as slow, persistent drips around the WG200 series transmission housing mating surfaces, particularly near the HOUSING interface.
  • Erratic gear engagement under load – When this seal fails, internal pressure drops cause delayed or harsh shifts, especially in WG92 and WG98 models during low-speed maneuvering.
  • Low transmission fluid level without visible external leaks – The O-ring can allow internal cross-leakage between circuits, causing fluid to migrate into non-pressurized cavities, leading to intermittent slipping.
  • Overheating due to reduced lubrication flow – A compromised seal starves the PERIPHERALS assembly of adequate oil, raising operating temperatures beyond normal thresholds.

Technical Specifications

Parameter Value
Part Number 0634.100.317
Material Nitrile Butadiene Rubber (NBR) / FKM compound
Inner Diameter ~18.0 mm (estimated)
Cross-Section ~2.5 mm (estimated)
Weight ~3 grams
OEM Reference ZF 0634.100.317
Hardness Shore A 70 ±5
Temperature Range -40°C to +120°C continuous

Compatibility

This O-ring is specifically validated for the following ZF transmission platforms: WG180, WG200, WG92, WG94, and WG98 series. It is also compatible with earlier WG90 variants where the RANGE SELECTOR assembly interfaces with the main housing. For WG200 models, this seal is used in both the main control bore and the auxiliary pressure port. Always verify the groove dimensions in your specific housing casting before installation, as late-model WG98 units may use a slightly different cross-section.

Related Components

Part Number Name Function
0631306174 CYLINDRICAL PIN Aligns valve body to housing
0769123894 TYPE PLATE Identification tag for transmission model
4660221012 SUCTION TUBE Oil pickup from pan to pump
0636103273 CAP SCREW Fastens housing sections
0750100022 SCREW PLUG Seals test ports
4660101804 TRANSMISSION HOUSING Main structural casting

Authorized ZF Distributor

We are a certified supplier of genuine ZF components.

ZF Official Authorization Certificate
Weight 0.008 kg
Transmission Fitment

ZF 4 WG 92, ZF 4 WG 98, ZF 4 WG 98 PS, ZF 6 WG 200(555/3), ZF WG 92, ZF WG 92 S 4, ZF WG 98

Section

Transmission Housing

Weight

0.0 kg

Part Type (CN)

O-Ring