Overview
The ZF 4700.221.015 HYDRAULIC MOTOR is a critical OEM genuine component designed to convert hydraulic pressure into mechanical rotary power within ZF powershift transmissions. This motor sits directly within the transmission housing assembly, driving the final drive and enabling precise torque delivery for heavy-duty construction machinery. As a genuine ZF part, the SKU 4700.221.015 ensures exact fitment and factory-specified performance, eliminating the risk of premature wear associated with aftermarket alternatives. When installed alongside the 4108101112 HOUSING and 4108201177 HOUSING, this hydraulic motor forms the core of the transmission’s hydraulic circuit, providing reliable power transfer under extreme loads.
Symptoms of Failure
- Hydraulic oil leaks around the motor seal: Worn internal seals cause visible fluid seepage near the motor housing, often accompanied by a drop in system pressure. Search query: “ZF hydraulic motor oil leak repair.”
- Intermittent gear slipping under load: A failing motor cannot maintain consistent hydraulic flow, leading to sudden loss of torque when the machine is under heavy strain. Search query: “transmission gear slipping when digging.”
- Unusual whining or grinding noises: Internal bearing wear or cavitation produces high-pitched sounds during operation, indicating imminent motor failure. Search query: “ZF transmission whining noise hydraulic motor.”
- Reduced travel speed or sluggish response: The motor fails to deliver full RPM, causing the vehicle to move slower than expected even at high throttle. Search query: “construction equipment slow travel speed.”
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4700.221.015 |
| Type | Hydraulic Motor (Axial Piston) |
| Material | Hardened Steel / Aluminum Alloy |
| Weight | 12.4 kg (27.3 lbs) |
| Dimensions (L x W x H) | 285 mm x 145 mm x 145 mm |
| OEM Reference | ZF 4700.221.015 |
| Max Operating Pressure | 350 bar (5,076 psi) |
| Displacement | 55 cc/rev |
Compatibility
This hydraulic motor is engineered for use in ZF WG series powershift transmissions commonly found in wheel loaders, telehandlers, and excavators. Based on its design and mounting configuration, the 4700.221.015 is compatible with the following ZF transmission models:
- ZF WG180
- ZF WG200
- ZF WG210
- ZF WG220
For proper installation, ensure the 0636302056 SCREW PLUG is torqued to specification and the 4108301304 BEARING COVER is aligned correctly to prevent contamination.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101112 | HOUSING | Encloses the motor assembly and directs hydraulic flow |
| 4108201177 | HOUSING | Secondary housing for gear support and alignment |
| 0636302056 | SCREW PLUG | Seals hydraulic ports to prevent fluid loss |
| 4108301304 | BEARING COVER | Protects motor bearings from debris and retains lubrication |
| 4108306173 | GASKET | Provides leak-proof seal between motor and housing |
| 0750110040 | SHAFT SEAL | Prevents oil leakage along the motor output shaft |
| 4108102042 | INPUT | Transfers rotational force from motor to gear train |
| 4108302099 | PLANET CARRIER | Houses planetary gears for torque multiplication |
| 4108302007 | BEARINGSHEET | Shim set for precise bearing preload adjustment |
| 0635332196 | BALL BEARING | Supports rotating shaft with minimal friction |
