Hydraulic Power Unit Preventive Maintenance Checklist

How to use it

Print or export the list and assign each group to a role: operators own the shift checks, technicians own filter, fluid and component rounds, and a planner owns the annual review. Mark failed items and write a work order for each. Record numbers, such as filter differential pressure, motor current and oil temperature, because a trend beats a pass or fail mark. Items marked critical involve stored energy, safety devices or pressure limits and should be fixed before the machine is returned to service.

• Use the same sampling port and procedure each time
• Record numbers, not just pass or fail
• Lock out and bleed down before opening any circuit
• Keep a clean-oil transfer cart for top-up

Setting intervals

The intervals here are starting points. Increase frequency in dusty, hot or high-duty environments, and relax them only with oil analysis and filter data to back it up. Condition-based triggers, such as changing filters on differential pressure rather than hours, usually reduce both cost and failures. Review failed items monthly and promote any recurring failure into a design or sourcing action, such as a finer return filter or a better breather.