Overview
The ZF 2093.122.026 PUMP DRIVE is a critical hydraulic component engineered specifically for the WG100, WG130, and WG131 transmission series. This OEM genuine part serves as the primary interface between the transmission’s power take-off (PTO) and the hydraulic pump, ensuring consistent oil flow for clutch actuation and lubrication. Located within the main gearbox housing, the pump drive transmits rotational torque directly from the transmission’s internal gears. The SKU 2093.122.026 is the definitive ZF reference for this unit, guaranteeing exact fitment and OEM-specified tolerances. When paired with the 2093101054 HOUSING, it forms a sealed assembly that prevents contamination and maintains hydraulic pressure integrity.
Symptoms of Failure
- Hydraulic oil leaks at the pump drive seal: Worn O-rings or a cracked drive housing allow transmission fluid to seep past the shaft, leaving puddles under the vehicle and reducing system pressure.
- Intermittent gear slipping under load: A failing pump drive cannot maintain steady hydraulic flow, causing delayed or erratic clutch engagement, especially during uphill or heavy-load operations.
- Whining or grinding noise from the transmission bell housing: Bearing wear inside the pump drive produces a high-pitched whine that escalates to a metallic grind as the drive gear loses alignment.
- Erratic PTO engagement or disengagement: The pump drive’s inability to transfer consistent torque results in the power take-off failing to lock or releasing unexpectedly during operation.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 2093.122.026 |
| Material | Hardened alloy steel with corrosion-resistant coating |
| Weight | 2.4 kg (5.3 lbs) |
| Overall Length | 145 mm |
| Drive Gear Diameter | 68 mm |
| Shaft Spline Count | 14-tooth SAE B spline |
| OEM Reference | ZF 2093.122.026 |
| Operating Pressure Range | 10–25 bar (145–363 psi) |
| Temperature Range | -20°C to +120°C (-4°F to +248°F) |
Compatibility
This pump drive is factory-specified for the ZF WG100, WG130, and WG131 series transmissions. It also retrofits into the WG180 and WG200 models when used with the correct 2093301072 TRANSMISSION HOUSING adapter. For WG131 variants, the drive integrates seamlessly with the 2093298128 TRANSMISSION HOUSING to maintain proper gear mesh. Always verify that the 0501209878 TAPPET SWITCH is functioning correctly, as it signals the pump drive’s engagement status to the transmission control unit.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093101054 | HOUSING | Encloses the pump drive and seals hydraulic fluid |
| 2093301072 | TRANSMISSION HOUSING | Main gearbox casing for WG180/WG200 series |
| 2093298128 | TRANSMISSION HOUSING | Alternate housing for WG131 variants |
| 0501209878 | TAPPET SWITCH | Monitors pump drive engagement position |
| 0501311096 | PROTECTING SLEEVE | Shields drive shaft from debris ingress |
| 0730365092 | TYPE PLATE | Identification label for transmission model |
| 0666690171 | ADHESIVE | Secures type plate to housing surface |
| 4475280150 | SCREW PLUG | Seals hydraulic test ports |
| 0634304731 | O-RING | Provides leak-proof seal between pump drive and housing |
| 0637510223 | SCREW PLUG | Drain plug for transmission oil pan |
Frequently Asked Questions
Q: Can the ZF 2093.122.026 pump drive be installed without removing the transmission?
A: Yes, in most applications the pump drive is accessible from the side of the transmission bell housing. However, you must first remove the 0501209878 TAPPET SWITCH and drain the hydraulic fluid to avoid contamination.
Q: What is the typical service life of this pump drive?
A: Under normal operating conditions with proper fluid maintenance, the OEM genuine 2093.122.026 pump drive lasts 4,000–6,000 hours. Premature failure often results from using incorrect O-rings or failing to replace the 0634304731 O-RING during reassembly.
Q: Will this part work with a WG131 transmission that has a different housing?
A: Yes, but you must verify that the 2093298128 TRANSMISSION HOUSING is installed. The pump drive’s spline depth is matched specifically to that housing’s internal gear offset.
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Phone: +86 158 2286 3467 |
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