What is included in an air compressor 500-hour service?

A 500-hour air compressor service is a major (annual) service that carries forward all 250-hour tasks (engine oil and filter, compressor oil level check, safety valve test, belt and hose inspection) and adds fuel filter replacement, air filter element replacement, compressor oil separator element replacement (rotary screw), safety relief valve pop test to rated pressure, receiver tank internal inspection for corrosion and scale, pressure regulator adjustment, drive belt replacement, minimum pressure valve inspection, aftercooler service, unloader valve inspection, full compressor oil change (rotary screw), full electrical check (wiring, contactors, overloads) and vibration isolator mount check. It takes approximately 2 to 3 hours.

What additional items does a 500-hour service include compared to a 250-hour service?

Beyond the 250-hour service, the 500-hour interval adds: replacing the fuel filter, replacing the air filter element, replacing the compressor oil separator element (rotary screw), performing a pop test on the safety relief valve to rated pressure, inspecting the receiver tank internally for corrosion and scale, checking and adjusting the pressure regulator, replacing drive belts, inspecting the minimum pressure valve, servicing the aftercooler (clean/blow out), inspecting the unloader valve, performing a full compressor oil change (rotary screw), a full electrical check covering wiring, contactors and overloads, and checking vibration isolator mounts.

Why is receiver tank inspection important at 500 hours?

The receiver tank stores compressed air under high pressure. Over time, condensate, corrosion and scale can weaken the tank walls and compromise the vessel integrity. The 500-hour internal inspection checks for pitting, rust, scale build-up and weld deterioration. Catching corrosion early prevents catastrophic tank failure and ensures compliance with Australian Standards for pressure vessels. If significant corrosion is found, the tank may need ultrasonic thickness testing or replacement.

Is the template free to use without MapTrack?

Yes. Download and use the air compressor 500-hour service procedure for free. Open the file and use your browser's Print, then Save as PDF. No MapTrack account required. If you later want digital service procedures linked to each machine with scheduling by hours, cost tracking and alerts, we would be happy to show you MapTrack.

Skip to download form

Free air compressor 500-hour service checklist

Enter your email below to download the PDF-ready service procedure. No account required.

A step-by-step 500-hour (major / annual) service procedure for portable diesel air compressors. This service carries forward all 250-hour tasks and adds fuel filter replacement, air filter replacement, compressor oil separator element, full compressor oil change, drive belt replacement, receiver tank internal inspection, aftercooler service, full electrical check and vibration mount inspection. Includes fluid specifications, parts list and technician sign-off. This page explains what the service involves, how to perform it, and offers a free PDF-ready form you can download straight away.

Last updated: 2026-03-26 · MapTrack

Jarrod Milford

Commercial Director

Updated 26 March 2026

How to use: Complete the 250-hour service first, then work through each additional action in this procedure. Tick Done as each task is completed. Record fluid quantities and part numbers used. Set the next service due hours and sign off.

✓ PDF-ready. Open and print to PDF
✓ Includes fluid specs, parts list and sign-off
✓ Free to use with or without MapTrack

See the template in action →

Download free PDF template

Trusted by Australian contractors and maintenance teams

We use your email to send your download and occasional MapTrack updates. Unsubscribe anytime. Privacy policy

Preview the template

See the first part of the service procedure below. Enter your email above to download the full air compressor 500-hour service procedure (PDF-ready).

Download to get the full template →

What is an air compressor 500-hour service?

A 500-hour service is the second tier (major / annual) of scheduled preventive maintenance for a portable diesel air compressor. It is performed every 500 engine hours or annually, whichever comes first. The 500-hour service carries forward all 250-hour tasks (engine oil and filter change, compressor oil level check, safety valve test, belt and hose inspection) and adds more in-depth maintenance: replacing the fuel filter, replacing the air filter element, replacing the compressor oil separator element (rotary screw), performing a safety relief valve pop test to rated pressure, inspecting the receiver tank internally for corrosion and scale, adjusting the pressure regulator, replacing drive belts, inspecting the minimum pressure valve, servicing the aftercooler, inspecting the unloader valve, performing a full compressor oil change, a full electrical check and checking vibration isolator mounts. It is typically performed by a qualified mechanic or fitter.

Benefits of scheduled air compressor servicing

Reduced breakdowns: regular oil, filter and fluid changes prevent engine and compressor failures that cause unplanned downtime on site.
Extended component life: fresh compressor oil, new separator elements and clean aftercoolers reduce wear on the compressor element, valves and drive system.
Lower repair costs: a 500-hour service costs a fraction of an emergency breakdown repair. Catching issues early prevents cascading damage.
Operator safety: pop testing the safety relief valve, inspecting the receiver tank internally, checking electrical systems and testing emergency stops reduces the risk of on-site incidents involving pressure equipment.
Compliance: documented service records demonstrate that pressure equipment is maintained to WHS and Australian Standards, supporting insurance and regulatory obligations.
Resale value: a complete service history with documented 250 and 500-hour services increases the compressor's value at trade-in or sale.

Benefits of digitising forms in MapTrack

When you move from paper or static PDFs to digital forms in MapTrack, you get:

Field users can easily scan a QR code to complete a form on mobile. Unlimited users.
Automatically get alerts when faults are identified.
Link every form digitally as a PDF to the relevant asset, location or person.
Receive a digital PDF copy with every submission to your email.
Ability to share forms digitally.
Build conditional logic (show or hide questions based on answers).
Take pictures or attach photos. Not possible with a paper-based form.
Electronic signatures.
Edit forms later without reprinting.
Restrict permissions (who can view, complete or approve).
Build forms with AI (describe what you need and MapTrack suggests the form).

Book a demo to see digital service procedures and hour-based scheduling in MapTrack.

Service actions included in the 500-hour procedure

This service procedure covers 13 additional service actions (beyond the 250-hour tasks) across 4 system areas:

Engine: replace fuel filter, replace air filter element.
Compressor system: replace compressor oil separator element, pop test safety relief valve, inspect receiver tank internally, adjust pressure regulator, replace drive belts, inspect minimum pressure valve, service aftercooler, inspect unloader valve, full compressor oil change.
Electrical: full electrical check (wiring, contactors, overloads).
Structural: check vibration isolator mounts.

Fluid specifications

General fluid specifications for portable diesel air compressors. Capacities vary by compressor size and manufacturer.

System	Type / Grade	Approx. Capacity
Engine oil	15W-40 CI-4 / CK-4	6 - 12 L
Compressor oil (rotary screw)	PAO or mineral	8 - 15 L (full change)
Grease	EP2 lithium complex	As required

Specifications are general guidelines. Always refer to the manufacturer's service manual for your specific make and model.

Parts and consumables

Have the following parts and consumables ready before starting the 500-hour service (in addition to 250-hour parts):

Engine oil (15W-40 CI-4/CK-4) - 6-12 litres
Engine oil filter - 1
Fuel filter - 1
Air filter element - 1
Fuel/water separator element - 1
Compressor oil separator element - 1
Drive belts - 1 set
Compressor oil (full change) - 8-15 litres
EP2 grease cartridges - 1-2
Rags, drip tray and waste oil container

Look up part numbers in the manufacturer's parts manual for your specific make and model before ordering.

How to perform an air compressor 500-hour service

Complete the 250-hour service procedure first. All 250-hour tasks are carried forward into the 500-hour service.
Shut down the compressor, depressurise fully and isolate the engine. Record the equipment details and current hour meter reading.
Replace the fuel filter and air filter element. These are full replacements at the 500-hour interval (not just inspection).
Replace the compressor oil separator element (rotary screw). Drain and replace the compressor oil with fresh oil to the correct level.
Pop test the safety relief valve to rated pressure. Inspect the receiver tank internally for corrosion, pitting and scale.
Check and adjust the pressure regulator. Replace the drive belts. Inspect the minimum pressure valve.
Service the aftercooler (clean/blow out). Inspect the unloader valve for correct operation.
Perform a full electrical check: inspect wiring, contactors and overloads. Check vibration isolator mounts.
Start the compressor and check for leaks, abnormal noises or warning lights. Verify operating pressure reaches the correct set point. Record any defects or recommendations in the notes section.
Set the next service due hours (next 250-hour and next 500-hour intervals). Sign off and update the machine's maintenance log.

In MapTrack, you can schedule services based on hour meter readings, get automatic reminders, complete service procedures on mobile and link every record to the machine. Book a demo to see how.

Get the free template

Enter your email above to download the air compressor 500-hour service procedure.

Back to download form

Air compressor service interval hierarchy

Air compressor maintenance follows a tiered schedule where each level includes all tasks from the level below. This is called carry-forward or cumulative servicing.

250 hours - Minor service

Engine oil and filter, compressor oil check, safety valve test, belt and hose inspection. Estimated 1-1.5 hours.

500 hours / annual - Major service (you are here)

All 250-hour tasks plus fuel filter, air filter, separator element, full compressor oil change, drive belts, receiver tank inspection, electrical check. Estimated 2-3 hours.

In MapTrack, you can configure service schedules by engine hours and receive automatic alerts when each interval is due.

Frequently asked questions

What is included in an air compressor 500-hour service?: A 500-hour air compressor service is a major (annual) service that carries forward all 250-hour tasks (engine oil and filter, compressor oil level check, safety valve test, belt and hose inspection) and adds fuel filter replacement, air filter element replacement, compressor oil separator element replacement (rotary screw), safety relief valve pop test to rated pressure, receiver tank internal inspection for corrosion and scale, pressure regulator adjustment, drive belt replacement, minimum pressure valve inspection, aftercooler service, unloader valve inspection, full compressor oil change (rotary screw), full electrical check (wiring, contactors, overloads) and vibration isolator mount check. It takes approximately 2 to 3 hours.
What additional items does a 500-hour service include compared to a 250-hour service?: Beyond the 250-hour service, the 500-hour interval adds: replacing the fuel filter, replacing the air filter element, replacing the compressor oil separator element (rotary screw), performing a pop test on the safety relief valve to rated pressure, inspecting the receiver tank internally for corrosion and scale, checking and adjusting the pressure regulator, replacing drive belts, inspecting the minimum pressure valve, servicing the aftercooler (clean/blow out), inspecting the unloader valve, performing a full compressor oil change (rotary screw), a full electrical check covering wiring, contactors and overloads, and checking vibration isolator mounts.
Why is receiver tank inspection important at 500 hours?: The receiver tank stores compressed air under high pressure. Over time, condensate, corrosion and scale can weaken the tank walls and compromise the vessel integrity. The 500-hour internal inspection checks for pitting, rust, scale build-up and weld deterioration. Catching corrosion early prevents catastrophic tank failure and ensures compliance with Australian Standards for pressure vessels. If significant corrosion is found, the tank may need ultrasonic thickness testing or replacement.
Is the template free to use without MapTrack?: Yes. Download and use the air compressor 500-hour service procedure for free. Open the file and use your browser's Print, then Save as PDF. No MapTrack account required. If you later want digital service procedures linked to each machine with scheduling by hours, cost tracking and alerts, we would be happy to show you MapTrack.

Need digital service procedures scheduled by engine hours?

Register every air compressor in MapTrack. Set up 250 and 500-hour service schedules, complete procedures on mobile, track parts and costs, and get automatic alerts when the next service is due.

Start free trial Book a demo

Maintenance · Meter-based maintenance · PM scheduling · Resources