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How To Add Grease To ST-400 Valcrum Threaded Grease Caps  

Updated 10/30/2025 | Published 10/02/2025

Question:

How do I add grease to st-400-01 don’t seem like grease will go as far as oil

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Expert Reply:

Hello Quan, thanks for reaching out. It sounds like you have one of the ST-400 Valcrum Threaded Grease Caps like part # VA63JR. If so, to add grease to this you pop out the light grey center plug to reveal the grease zerk underneath.

expert reply by:
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Jesse M
Jesse M. profile picture
Etrailer Expert

Jesse M.

10/30/2025

Hey Quan, did popping out the center plug to reach the grease zerk work for adding grease to your ST-400 cap? Knowing how that went could help others trying to switch from oil to grease caps.

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