The mill cannot be loaded with oil
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What are the reasons why oil cannot be supplied to the coal grinder?
Clogged inlet and outlet filters, problems with solenoid valves and proportional relief valves, issues with the pump itself, leakage at the outlet O-rings
The trick involves switching between motion and stillness, lifting and grinding the rails, and using a wire to poke at the spool of the directional valve; this should be enough to push the small object out. If that doesn’t work, the only option is to remove the relief valve and the directional valve, then use an air blower.