This annual preventive maintenance checklist (Code: HY12AN) guides technicians through servicing Delta hydraulic actuator gate systems. It covers required tools and materials, site safety, and lockout/tagout, then details step-by-step procedures: inspecting control functions and limit switches; checking hoses and fittings for wear and leaks; servicing the hydraulic power unit, including draining and flushing the reservoir, replacing filters, and refilling with clean oil; verifying accumulator pressure and relief valve settings; inspecting electrical connections; cleaning and lubricating motors; measuring current; cleaning the HPU; and cycling the barrier to confirm smooth operation. Record results in the maintenance log.
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