EGO CS1800 Power Chainsaw Cs1800 Leaking Oil

Oil Pump Assembly

The oil pump contains internal seals and check-valves designed to prevent fluid flow when the motor is static. If these seals degrade or the pump housing warps, gravity and internal tank pressure allow oil to bypass the pump mechanism and leak continuously through the guide-bar port. This is the most common cause for a reservoir that empties during storage.

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Oil Tank Cap Assembly

The cap contains a duckbill valve meant to equalize pressure and prevent a vacuum from forming during operation. If this valve becomes clogged or fails to vent properly, thermal expansion of air inside the tank (caused by ambient temperature changes) will increase internal pressure, physically forcing oil through the delivery lines and pump even when the tool is off.

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Oil Delivery Tube

This internal rubber line connects the reservoir to the oil pump. Over time, vibration and chemical exposure can cause the rubber to fatigue, crack, or slip off the pump barbs, resulting in a gravity-fed leak that pools within the tool's plastic chassis and eventually exits through the bottom casing.

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