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Either the system is overfilled or a valve is seized.

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13y ago
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6mo ago

There could be a few possible reasons for hydraulic oil spilling from the fill cap when dumping a dump truck. One reason could be that the hydraulic system is overfilled, causing excess pressure and resulting in oil leakage. Another possibility could be a faulty or damaged fill cap, causing inadequate sealing. It is also important to check if the dump truck is tilted or positioned unevenly during dumping, which could lead to oil spillage from the fill cap.

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Q: When dumping a dump truck the hydraulic oil spills from fill cap why?
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