Overview
The ZF 4143.020.253 2 HL 290 Hydrostatic Drive Assembly is a complete, pre-assembled unit engineered for demanding industrial driveline applications. This assembly integrates the hydraulic motor and reduction gearing into a single, sealed module, delivering precise variable-speed control and high torque output for ZF transmissions. As a direct replacement for the SKU 4143.020.253, this unit is critical for restoring full hydrostatic functionality in HL 100 Series and HL 270 Series systems. It sits at the heart of the transmission’s power take-off circuit, converting hydraulic pressure into mechanical rotation for auxiliary drives.
Symptoms of Failure
- Erratic speed control or complete loss of hydrostatic drive: When the 4143.020.253 assembly wears, operators often report the auxiliary drive surging, failing to maintain a set speed, or stopping entirely under load.
- External oil leaks at the motor housing or shaft seal: Worn internal seals or a cracked 4143101050: HOUSING will allow hydraulic fluid to escape, leading to low oil levels and eventual transmission damage.
- Excessive noise or vibration during operation: A failing hydrostatic unit produces a distinct whining or grinding noise, often accompanied by vibration, indicating bearing wear or internal component damage.
- Overheating of the drive assembly: Internal slippage or blocked fluid passages cause the unit to run hot, which can degrade seals and accelerate failure of the 4143301055: HOUSING and other components.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 4143.020.253 |
| Assembly Type | 2 HL 290 Hydrostatic Drive (Complete Unit) |
| OEM Reference | ZF 2 HL 290 |
| Material | High-strength cast iron housing with hardened steel gears |
| Dry Weight (approx.) | 18.5 kg (40.8 lbs) |
| Overall Dimensions (L x W x H) | 320 mm x 220 mm x 190 mm |
| Maximum Operating Pressure | 250 bar (3,625 psi) |
| Maximum Input Speed | 3,000 RPM |
Compatibility
This hydrostatic drive assembly is designed for integration into ZF’s HL 100 and HL 270 series transmissions. It is commonly used in WG180, WG200, and WG210 models found in agricultural tractors, construction loaders, and industrial forklifts. The unit also interfaces directly with the 4143298040: CASE and is secured using a 0631329135: SPRING PIN for alignment. Always verify your transmission model and serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101050 | HOUSING | Encloses and supports the hydrostatic motor assembly |
| 4143301055 | HOUSING | Secondary housing for gear reduction and output shaft |
| 4143298040 | CASE | Main structural casing for the drive unit |
| 0631329135 | SPRING PIN | Alignment and retention pin for assembly |
| 0636101024 | CAP SCREW | Fastener for securing housing components |
| 4475280099 | SCREW PLUG | Seals hydraulic ports and test points |
| 0634303266 | O-RING | Provides leak-proof seal between mating surfaces |
| 0501200072 | VENT VALVE | Relieves internal pressure and prevents contamination |
| 0501217673 | LUBRICATING NIPPLE | Grease fitting for periodic bearing lubrication |
| 0636302031 | SCREW PLUG | Drain or fill plug for hydraulic circuit |
