Agrison HP ULTRA Series Operation Manual page 71

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The oil must be clean. Filter core and oil must be checked frequently by dripping a drop of
oil on blotter paper; if there a black center on the oil stain, it indicates that oil should be
replaced.

After replacement of engine oil, the gas in oil cylinder shall be exhausted by loosening
bolted joint of steering cylinder to oil pump going on low-speed running for air bleeding
until there is no bubble in the outflow oil.
Important matters:
1. Pressure relief valve of constant overflow pump will have well-adjusted safety
overfall pressure before delivery. Make sure not to detach and adjust it randomly.
2. Constant overflow pump is a precision part. It is not allowed to be detached
randomly under normal circumstances. It must be detached at the place of cleaning,
and washed by clean gasoline or kerosene.
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Maintenance Instructions
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