Overview
The ZF 2094.122.409 PUMP DRIVE is a critical hydraulic component engineered for the WG100, WG130, and WG131 transmission series. This OEM genuine part transfers rotational power from the transmission’s internal gear train to the hydraulic pump, ensuring consistent oil flow for clutch actuation and lubrication. Positioned directly on the pump housing, the 2094.122.409 drive gear interfaces with the main shaft assembly to maintain precise hydraulic pressure. The SKU 2094.122.409 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in heavy-duty industrial applications.
Symptoms of Failure
- Hydraulic pressure loss during gear engagement: A worn pump drive can cause intermittent pressure drops, leading to sluggish shifting or delayed clutch response in WG100 transmissions.
- Audible whining or grinding from the pump housing: Damaged gear teeth on the 2094.122.409 produce a high-pitched noise under load, often mistaken for pump cavitation.
- Oil leaks near the pump mounting flange: Excessive play in the drive gear can distort the seal surface, resulting in visible hydraulic fluid seepage around the WG130/WG131 pump interface.
- Erratic transmission temperature spikes: Insufficient pump output due to a failing drive gear forces the system to overwork, causing rapid oil overheating during normal operation.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 2094.122.409 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Weight | 1.85 kg (4.08 lbs) |
| Outside Diameter | 98.5 mm |
| Internal Bore Diameter | 28.0 mm |
| Gear Width | 32.0 mm |
| OEM Reference | ZF 2094.122.409 |
| Hardness | 58–62 HRC (tooth flank) |
Compatibility
This pump drive is specifically designed for ZF WG-series powershift transmissions. Verified compatible models include the WG100, WG130, and WG131. It may also be suitable for the WG180 and WG200 series when used with the correct hydraulic pump adapter. Always cross-reference your transmission’s serial number with the 2094.122.409 to confirm fitment. The drive gear works in conjunction with the 2094104412 MAIN SHAFT and the 2094304054 MAIN SHAFT to ensure proper torque transfer. For shift actuation, pair it with the 2094106010 SHIFT SYSTEM and the 2094206001 GEARSHIFT SHAFT.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2094104412 | MAIN SHAFT | Transfers torque from engine to gear train |
| 2094304054 | MAIN SHAFT | Alternate shaft for WG130/WG131 variants |
| 2094106010 | SHIFT SYSTEM | Controls clutch pack engagement |
| 2094206001 | GEARSHIFT SHAFT | Links shift fork to hydraulic actuator |
| 2094306053 | GEARSHIFT SHAFT | Heavy-duty variant for high-torque applications |
| 0630513070 | SNAP RING | Secures pump drive gear on shaft |
| 2094306019 | WASHER | Thrust washer for axial load distribution |
| 0732040444 | COMPRESSION SPRING | Provides preload for shift detent mechanism |
| 0732040728 | COMPRESSION SPRING | Higher-rate spring for WG200 applications |
| 2093206001 | BUSH | Guide bushing for gearshift shaft alignment |
Frequently Asked Questions
Q: Can the 2094.122.409 pump drive be used in a ZF WG180 transmission?
A: While the WG180 shares the same pump mounting pattern, we recommend verifying the gear tooth count and shaft diameter. The 2094.122.409 is primarily designed for WG100/WG130/WG131 models; consult your transmission’s parts manual for cross-reference.
Q: What causes premature wear on this pump drive gear?
A: Contaminated hydraulic fluid is the most common cause. Abrasive particles accelerate tooth flank wear, leading to the symptoms listed above. Always replace the oil filter and flush the system when installing a new 2094.122.409.
Q: Do I need to replace the snap ring (0630513070) when installing this part?
A: Yes. The snap ring is a single-use fastener that can lose tension after removal. We strongly recommend ordering a new 0630513070 SNAP RING to ensure proper retention of the pump drive gear.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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