ZF 4699.170.039 MOTOR | OEM Genuine Part

Overview

The ZF 4699.170.039 MOTOR is a critical hydraulic drive component engineered for high-torque applications within ZF construction machinery transmissions. This OEM genuine part converts hydraulic pressure into precise rotational force, directly engaging the transmission’s clutch packs and planetary gear sets. Positioned at the valve body interface, the motor regulates oil flow to shift actuators, ensuring smooth gear transitions under heavy loads. The SKU 4699.170.039 is specifically designed to withstand extreme pressure spikes and thermal cycling common in excavators and wheel loaders. When paired with a robust BASIC PARTS assembly, this motor delivers consistent performance in demanding environments. Its failure often compromises the entire drivetrain, making it a priority replacement part for fleet maintenance.

Symptoms of Failure

• Erratic gear engagement or slipping: A worn 4699.170.039 motor fails to maintain hydraulic pressure, causing delayed or incomplete clutch pack engagement. Operators may notice the transmission “hunting” for gears under load.
• Internal hydraulic fluid leaks: Degraded seals within the motor allow oil to bypass the rotor, leading to visible drips near the transmission housing or a sudden drop in fluid level. This often accompanies a burnt oil smell.
• Unusual whining or grinding noises: When the motor’s internal bearings or gerotor set wear, metallic debris enters the oil circuit. This produces a high-pitched whine during acceleration or a grinding sound in neutral.
• Reduced machine power or stalling: A failing motor cannot deliver adequate torque to the HOUSING assembly, resulting in sluggish travel speeds or engine stall when the transmission shifts under load.

Technical Specifications

Compatibility

This motor is engineered for ZF’s heavy-duty powershift transmissions used in construction machinery. It is a direct fit for the WG180 and WG200 series, commonly found in wheel loaders and dozers. It also integrates with the WG150 and WG250 models when used in conjunction with the correct GEAR SHAFT and PLANET CARRIER assemblies. Always verify the transmission serial number before installation, as minor revisions in valve body porting may require additional shims. The 4699.170.039 replaces earlier variants (e.g., 4699.170.035) with improved thermal tolerance.

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