Overview
The ZF 4143.020.140 2 HL 270 Hydrostatic Drive Assembly is a complete, factory-matched unit designed to manage hydraulic power distribution within ZF’s HL 100 and HL 270 series transmissions. This assembly integrates the pump and motor functions into a single sealed package, converting engine torque into infinitely variable hydraulic flow for precise vehicle speed and direction control. The SKU 4143.020.140 is a direct replacement for worn or failed assemblies, restoring full power transmission efficiency in heavy-duty off-road machinery. It sits at the heart of the transmission’s hydrostatic circuit, working in tandem with the 4143101046 HOUSING and the 4143301055 HOUSING to contain high-pressure fluid and maintain system integrity.
Symptoms of Failure
- Hydrostatic drive slipping under load: When the 4143.020.140 assembly loses internal sealing, the unit fails to maintain pressure, causing the vehicle to lose traction or speed during heavy pulling or climbing.
- External oil leaks at housing seams: Worn seals or cracks in the assembly casing often lead to visible hydraulic fluid seepage around the 4143298040 CASE and mating flanges, leaving puddles under the machine.
- Erratic or jerky movement at low speeds: Internal wear in the hydrostatic drive creates uneven fluid flow, resulting in sudden lurches or hesitation when inching the vehicle forward or backward.
- Excessive noise or whining from the transmission: A failing unit often produces a high-pitched whine or grinding sound due to cavitation or damaged internal components, especially during cold starts or high-load operation.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 4143.020.140 |
| Assembly Type | 2 HL 270 Hydrostatic Drive (Complete Unit) |
| OEM Reference | ZF 2 HL 270 Series |
| Housing Material | High-strength cast iron with corrosion-resistant coating |
| Dry Weight (approx.) | 48 kg (106 lbs) |
| Overall Dimensions (L x W x H) | 420 mm x 280 mm x 250 mm |
| Maximum Operating Pressure | 420 bar (6,090 psi) |
| Fluid Capacity (internal) | 3.2 liters |
| Mounting Bolt Pattern | 4-bolt SAE A flange |
Compatibility
This hydrostatic drive assembly is engineered for ZF transmissions in the HL 100 and HL 270 series families. It is a direct fit for models including the WG180, WG200, WG210, and WG250, as well as earlier 2 HL 270 variants used in agricultural tractors, telehandlers, and compact construction loaders. The unit also integrates with the 0631329135 SPRING PIN for precise alignment during installation. Always verify your transmission’s serial number and housing configuration before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101046 | HOUSING | Encloses the hydrostatic drive and supports internal bearings |
| 4143301055 | HOUSING | Opposite-side housing for fluid channel routing |
| 4143298040 | CASE | Main structural casing for the drive assembly |
| 0631329135 | SPRING PIN | Alignment pin for precise assembly positioning |
| 0501214034 | SEALING CAP | Seals hydraulic ports against contamination |
| 0636101024 | CAP SCREW | Fastens housing sections with high torque rating |
| 4475280099 | SCREW PLUG | Closes unused fluid passages |
| 0634303266 | O-RING | Provides static seal between mating surfaces |
| 0501200072 | VENT VALVE | Relieves internal pressure to prevent seal damage |
| 0501217673 | LUBRICATING NIPPLE | Grease fitting for external bearing points |
