Overview
The ZF 0734.317.160 U-RING is a critical sealing component engineered for high-pressure hydraulic circuits within ZF heavy-duty transmissions. Positioned between rotating shafts and stationary housings, this OEM genuine part prevents fluid bypass and maintains internal lubrication pressure. The SKU 0734.317.160 specifically corresponds to a precision-molded urethane ring designed to withstand extreme thermal cycling and abrasive contaminants common in construction machinery environments. Without this seal, the transmission cannot sustain the hydraulic clamping force required for clutch engagement, leading to immediate performance degradation.
Symptoms of Failure
When the ZF 0734.317.160 U-RING begins to degrade, operators will notice distinct operational anomalies. External oil seepage around the transmission bell housing is the most visible indicator, often appearing as a slow drip after extended operation. A second common symptom is erratic gear engagement under load, where the transmission hesitates or clunks when shifting from forward to reverse. Third, gradual loss of hydraulic pressure during cold starts manifests as delayed clutch pack activation, requiring increased throttle to initiate movement. Finally, contaminated transmission fluid with visible rubber particulates signals that the U-ring has begun fragmenting internally, which can cascade into valve body damage if ignored.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0734.317.160 |
| Type | U-Ring / Wiper Seal |
| Material | Polyurethane (AU 92 Shore A) |
| Inner Diameter | 160.0 mm |
| Outer Diameter | 175.0 mm |
| Cross-Section Height | 8.5 mm |
| Operating Temperature Range | -40°C to +120°C |
| Max Dynamic Pressure | 25 bar (360 psi) |
| Weight | 0.042 kg |
| OEM Reference | ZF 0734.317.160 |
Compatibility
This U-ring is dimensionally and materially validated for the following ZF transmission families used in construction and agricultural equipment:
- ZF WG180 series (all variants including WG180-1 through WG180-5)
- ZF WG200 series (WG200-2, WG200-3, WG200-4)
- ZF WG210 series (WG210-1, WG210-2)
- ZF Ecomat 4HP590 (when used in off-highway applications)
- ZF Ergopower 8HP series (select models with 160mm shaft interfaces)
Cross-reference verification is recommended for transmissions manufactured before 2005, as early WG180 units utilized a different groove geometry. The 0734.317.160 supersedes earlier ZF part numbers 0734.317.140 and 0734.317.150.
