Hour Meters, and Why Machines Are Serviced by Hours
Small engines, tractors, generators and boats are specified in running hours rather than dates. What an hour really measures, and how to track them without a meter.
Guide
Outdoor machines · OM-05
Air Compressor Maintenance Log
A free printable air compressor maintenance log — tank draining, pump oil, air filter, belts and valves, with a specification block.
Download Free · no sign-up
One page. Choose your paper size — both versions are laid out identically, so neither one gets shrunk to fit.
Print it and write on it
Fill it in type and save
The fillable versions have real form fields — open them in any PDF reader, type into them and save. Printing help.
What this sheet is for
Record the tank drain that protects against internal corrosion, and keep the servicing history for a machine that holds pressure.
Who it is for
Workshops, garages, home mechanics and anyone with a receiver-tank compressor.
How to use it
- Drain the tank after every session and log it — condensate corrodes the tank from the inside where you cannot see it.
- Record pump oil type and quantity once.
- Check the safety valve and belt condition at each service.
- Note any inspection or test requirement for your tank.
What is on the sheet
One page, top to bottom:
Printed under the title: Service and tank drain record for an air compressor. Draining condensate is the one job that decides whether the tank stays safe.
Drain it every time. Drain the tank after every session. Water collects in the bottom and corrodes the tank from the inside, where you cannot see it. Record it here so you know it is actually being done.
Write-on lines: Compressor make & model · Serial number · Engine make & model · Purchased · Warranty ends
Specifications — look these up once and never search again
Write-on lines: Tank size · Max pressure · CFM / l-min · Type · Pump oil type & qty · Oil change interval · Belt part no. · Air filter part no. · Tank test / inspection due
Maintenance log
Table, 7 rows: Date · Hours · Tank drained · Oil level / change · Air filter · Belt / valves · Notes
Ruled lines: Notes and anything specific to yours
Questions
Why does draining the tank matter so much?
Compressing air condenses water into the bottom of the receiver. Left there, it corrodes the tank from the inside — invisible from outside, and a tank under pressure is not something you want thinning.
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