GLS Class (X166) Produced from 2016 to 2019

ABC pump seal failure - GLS 550

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Old May 25, 2023 | 09:02 PM
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2017 GLS 550
ABC pump seal failure - GLS 550

Noticed some very thick oil/grease that has been getting slinged onto the driver's side turbo charger charge tube (the stainless steel tube) and gather that it's coming from the ABC pump after noticing that the hydraulic tank is also very low on fluid. I figured out that it's the pump that provides pressure for the active curve system (hydraulically controlled sway bars), and that the pump is about $1k. Has anyone had one replaced? It seems to be a "fairly common" thing to start leaking, and it also seems to be a pretty in-depth repair.
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Old May 25, 2023 | 09:38 PM
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No ABC on a 2017 GLS 550. Thank your lucky stars! Yes, I had the active curve pump replaced under warranty on my 63.
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Old May 25, 2023 | 10:01 PM
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2017 GLS 550
Originally Posted by BlownV8
No ABC on a 2017 GLS 550. Thank your lucky stars! Yes, I had the active curve pump replaced under warranty on my 63.
Yea, it's the hydraulic pump at the top of the accessory system. Some places call it the ABC pump, or the ARS pump, or Active Curve pump.
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