Overview
This OEM genuine ZF 2093.070.023 TRA 20 is a critical actuation component engineered for the hydraulic control system within heavy-duty construction machinery transmissions. Positioned within the valve body assembly, this part modulates oil flow to engage clutch packs and shift gears under load. The SKU 2093.070.023 is precision-machined to ZF’s original tolerances, ensuring consistent pressure regulation and smooth power delivery in demanding off-highway applications.
Symptoms of Failure
- Delayed or harsh gear engagement – When the TRA 20 wears internally, hydraulic pressure drops, causing a noticeable lag or jarring shift when moving from neutral to drive.
- Intermittent transmission slipping under load – A worn 2093.070.023 can allow clutch packs to slip during excavation or lifting, reducing torque transfer and machine productivity.
- External oil seepage at the valve body – Degraded seals on this part lead to fluid weeping around the transmission housing, often visible as dark residue on the casing.
- Erratic shifting in cold start conditions – Internal leakage past worn spools causes inconsistent hydraulic response until the oil warms up, a common complaint in cold-weather job sites.
Technical Specifications
| Specification | Value |
|---|---|
| OEM Part Number | 2093.070.023 |
| Material | Hardened steel with nitrile seals |
| Weight | 0.85 kg (1.87 lbs) |
| Length | 142 mm |
| Width | 38 mm |
| Height | 32 mm |
| Operating Pressure Range | 12–25 bar |
| OEM Reference | ZF 2093.070.023 |
Compatibility
This TRA 20 valve assembly is designed for ZF’s WG series powershift transmissions commonly used in wheel loaders and telehandlers. It is a direct fit for the WG180, WG200, and WG210 models. It also integrates into the 4WG-200 and 4WG-210 variants. When replacing this unit, always inspect the 2093140001: HOISTING UNIT and 2093240001: LIFTING SHAFT for wear, as they share the same hydraulic circuit. The 2095340002: BUSH and 2093340007: BRACKET are also commonly replaced during this service interval to prevent future leaks.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093140001 | HOISTING UNIT | Controls lifting cylinder flow in the transmission circuit |
| 2093240001 | LIFTING SHAFT | Transmits mechanical force to the valve spool |
| 2095340002 | BUSH | Provides wear surface for the actuation shaft |
| 2093340007 | BRACKET | Secures the valve body to the transmission housing |
| 0501327177 | PLAIN BEARING | Reduces friction on rotating shafts |
| 2093340008 | BRACKET | Alternative mounting bracket for different chassis |
| 5838300323 | BEARING BUSH | Supports the lifting shaft assembly |
| 0636011381 | HEXAGON SCREW | Fastens the bracket to the transmission |
| 0632604006 | LUBRICATING NIPPLE | Allows grease injection into the bushing |
| 5838300240 | SEALING RING | Prevents oil leakage at the valve body joint |
Frequently Asked Questions
Q: Can the 2093.070.023 be rebuilt, or must it be replaced?
A: This is a sealed OEM unit. Internal wear on the spool and bore cannot be serviced in the field; replacement with the genuine ZF part is required to restore proper hydraulic function.
Q: How do I know if my WG200 transmission needs this TRA 20 valve?
A: If you experience delayed engagement or erratic shifting specifically when the transmission oil is cold, the TRA 20 is a likely culprit. Always verify with a pressure test at the valve body test port.
Q: What torque should I use for the mounting screws when installing this part?
A: Use 25 Nm (18 ft-lbs) for the hexagon screws. Over-torquing can distort the valve body bore and cause sticking. Always replace the sealing ring (5838300240) during installation.
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Phone: +86 158 2286 3467 |
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