Overview
The ZF 2093.070.004 TRA 20 is an OEM genuine internal shift component engineered for the robust TRA 20 transmission series. This precision-machined part governs hydraulic flow within the valve body, directly controlling clutch engagement and gear selection in heavy construction machinery. As a critical wear item, the SKU 2093.070.004 ensures consistent pressure modulation, preventing erratic shifting under extreme loads. It sits at the heart of the transmission control unit, interfacing with the SHIFT SYSTEM to deliver smooth power transfer from the MAIN SHAFT to the final drive.
Symptoms of Failure
- Delayed or harsh gear engagement – When the 2093.070.004 wears, internal spools stick, causing a noticeable lag when shifting from neutral to drive or reverse. This is often accompanied by a loud clunk.
- Intermittent transmission slipping under load – Worn sealing surfaces allow hydraulic pressure to bleed off, leading to clutch pack slippage during excavation or grading operations.
- External oil seepage at the valve body – Cracks or O-ring degradation on this part produce slow drips of ATF around the transmission housing, visible as dark stains on the bell housing.
- Erratic shift patterns in cold start conditions – A failing TRA 20 component fails to modulate cold oil viscosity, resulting in jerky or incomplete gear changes until the transmission warms up.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 2093.070.004 |
| Material | Hardened steel alloy with nitrile seals |
| Weight | 1.2 kg (2.65 lbs) |
| Length | 145 mm |
| Diameter | 32 mm |
| OEM Reference | ZF TRA 20 |
| Operating Pressure | 12–18 bar |
Compatibility
This OEM genuine part is designed for the ZF TRA 20 transmission family, commonly found in wheel loaders, telehandlers, and graders. It is compatible with the WG180, WG200, and WG210 series when used with the TRA 20 valve body configuration. The 2093.070.004 works in tandem with the COUNTERSHAFT and T 7230 L to synchronize gear ratios. For proper installation, verify that your HOUSING casting number matches the TRA 20 specification.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093099024 | T 7230 L | Torque converter lockup clutch |
| 2093101054 | HOUSING | Transmission case cover |
| 2093103028 | COUNTERSHAFT | Intermediate gear shaft |
| 2093104018 | MAIN SHAFT | Primary power output shaft |
| 2093104411 | MAIN SHAFT | Alternate main shaft variant |
| 2093106036 | SHIFT SYSTEM | Hydraulic shift control assembly |
| 2093110024 | P.T.O. SHAFT | Power take-off drive shaft |
| 2093114010 | CRAWLER | Low-speed track drive gear |
| 2093122026 | PUMP DRIVE | Hydraulic pump input gear |
| 2093136006 | OIL SUPPLY | Lubrication oil distribution block |
Frequently Asked Questions
Q: Can the 2093.070.004 be replaced without removing the entire transmission?
A: Yes, this part is accessible after draining the fluid and removing the valve body cover. However, we recommend replacing the SHIFT SYSTEM seals simultaneously to prevent future leaks.
Q: What causes premature failure of the TRA 20 component?
A: Contaminated transmission fluid with metal debris from a worn COUNTERSHAFT is the primary cause. Always flush the system if the 2093.070.004 shows scoring.
Q: Is this part interchangeable with the TRA 30 series?
A: No. The TRA 20 uses a different spool diameter. Verify your HOUSING part number before ordering.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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