Wacker Neuson 5000119219 Coolant Overflow Cap

The Wacker Neuson Coolant Overflow Cap is a genuine OEM component designed for the LT4K, LTP4K, LT4Z, LTP4Z, LTW4Z, LTW4K, LTW6Z, LT4SK, LT4SZ, and LTP4SZ light tower series, as well as the G110, G125, and G155 mobile generator skid-mounted units. As a direct factory replacement, this cap seats onto the coolant overflow reservoir and maintains the correct pressure seal across the cooling system. It is sourced directly from Wacker Neuson, ensuring it meets the exact fitment and material requirements of the original part. Keep part number on hand as a low-cost service item that prevents costly cooling system issues before they start.

Key Features

• Genuine OEM Pressure Rating — Manufactured to Wacker Neuson's original pressure specification, ensuring the coolant overflow cap holds and releases at the correct threshold for the engine cooling system in these light tower and generator skid platforms.
• Direct Drop-In Replacement — Threaded to match the factory overflow reservoir neck on covered LT and LTW series light towers and G110–G155 generator skids; installs by hand with no additional hardware.
• Broad Fitment Coverage — A single part number covers the LT4K, LTP4K, LT4Z, LTP4Z, LTW4Z, LTW4K, LTW6Z, LT4SK, LT4SZ, LTP4SZ light tower family and the G110, G125, and G155 mobile generator skid models.
• Protects Engine from Overheating — A failed or missing overflow cap allows coolant to escape and air to enter the system, leading to unstable operating temperatures. A correctly seated cap keeps the cooling circuit pressurized and functioning as designed.
• Cooling System Integrity — An improperly sealed overflow cap can cause coolant loss that goes unnoticed until engine temperature climbs, making this a critical inspection item during routine service on any light tower or generator skid.

The coolant overflow cap seals the expansion reservoir that captures coolant displaced from the radiator as the engine heats up and then returns it once the engine cools down. By maintaining the correct pressure in this closed-loop system, the cap prevents coolant boil-over and ensures a consistent fluid level reaches the radiator. A cap that has lost its seal — through a cracked body, worn gasket, or damaged threads — will allow coolant to vent to atmosphere, causing gradual fluid loss and erratic temperature behavior that can shorten engine life on light towers and generator skids operating in sustained-duty cycles.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

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