ZF 5838.300.566 COOL LINIE | OEM Genuine Part

Overview

The ZF 5838.300.566 COOL LINIE is an OEM genuine heat exchanger component engineered specifically for heavy-duty ZF transmissions used in construction machinery. This part regulates transmission fluid temperature by routing oil through a dedicated cooling circuit, preventing thermal breakdown and ensuring consistent hydraulic pressure during prolonged operation under load. Positioned externally on the transmission housing, the 5838.300.566 interfaces directly with the vehicle’s cooling system to dissipate heat generated by gear meshing and friction. As a critical thermal management unit, it maintains optimal viscosity for lubricating internal assemblies such as the 2093109002: DIFFERENTIAL and the 2093209095: DIFFERENTIAL, ensuring long service life for all drivetrain components.

Symptoms of Failure

• Transmission overheating under load: When the COOL LINIE becomes clogged or develops internal leaks, the transmission rapidly exceeds normal operating temperatures, triggering warning lights or reducing machine performance.
• Oil leaks around the cooler housing: Cracks or degraded gaskets in the 5838.300.566 allow transmission fluid to escape, leaving puddles under the equipment and causing low fluid levels.
• Erratic gear engagement or slipping: Insufficient cooling leads to degraded oil viscosity, which starves the 0750117075: TAPER ROLLER BEARING and other rotating elements of proper lubrication, resulting in delayed or harsh shifts.
• Contaminated or burnt-smelling transmission fluid: A failing cooler allows coolant to mix with transmission oil, producing a milky appearance and a distinct burnt odor that indicates internal seal failure.

Technical Specifications

Compatibility

This COOL LINIE is designed for ZF’s WG series powershift transmissions commonly found in wheel loaders, telehandlers, and graders. It is directly compatible with the following ZF transmission models: WG180, WG200, WG211, and WG310. The 5838.300.566 also fits select variants of the 4WG-200 and 5WG-310 series used in construction machinery from manufacturers such as Volvo, Liebherr, and Caterpillar. Always verify the cooler mounting bracket orientation and hose routing against your specific transmission serial number before installation.

Related Components

Frequently Asked Questions

Q: Can the 5838.300.566 COOL LINIE be repaired, or must it be replaced?
A: This is a sealed OEM unit. Internal blockages or gasket failures cannot be reliably repaired; replacement with a genuine ZF 5838.300.566 is recommended to avoid recurring overheating issues.

Q: How often should this cooler be inspected on construction machinery?
A: During every major transmission service (every 2,000 operating hours or annually), check the cooler for debris buildup, fin damage, and external leaks. Replace immediately if any coolant-oil cross-contamination is detected.

Q: Does this part require any special tools for installation?
A: Standard hand tools are sufficient, but a torque wrench is necessary to tighten the mounting bolts and fluid line fittings to ZF specifications (typically 25-30 Nm). Always replace O-rings when reinstalling the cooler.