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GMC AC24L - User Manual

GMC AC24L
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AC24L/AC40L
030505 AC24/40L Ed5
INSTRUCTION MANUAL
2HP & 2-1/2HP
24 Litre & 40 Litre
Air Compressors
• Melbourne • Perth • Auckland • Hong Kong • Shanghai
• Taipei • New York • Verona • London • Paris
Warning!
Do not switch on
for the first time
without first
filling with oil.

Table of Contents

Questions and Answers

  • L
    Lawrence KirkJul 31, 2025
    What to do if my GMC AC24L Air Compressor motor won't run or is overheating?
    • K
      Kathryn Avila DVMJul 31, 2025
      If your GMC Air Compressor's motor won't run, runs too slow, or gets excessively hot, the possible causes include a power fault or low supply voltage (in this case, check the power supply), a power cord that's too long or thin (in this case, use an authorized service center to replace the power cord), a faulty pressure switch, a faulty motor, or a main compressor that's sticking or tight (in the last three cases, use an authorized service center to repair or replace the faulty parts).
  • W
    William HaneyAug 6, 2025
    Why is the pressure low on my GMC AC24L?
    • D
      Dana DanielsAug 6, 2025
      If your GMC Air Compressor experiences insufficient pressure or decreased outlet capacity, it might be due to the motor running too slow, a dirty air filter cartridge (in this case, clean or replace the filter cartridge), a leaking safety valve, a leaking pipe, a damaged gasket, a damaged or carbon-coated valve seat, or a damaged piston ring or cylinder. For issues beyond the air filter, it's best to have an authorized service center check and repair the compressor.
  • E
    eileengomezAug 11, 2025
    Why is my GMC AC24L using too much oil?
    • R
      Ryan HowellAug 11, 2025
      Excessive oil consumption in your GMC Air Compressor can stem from several issues. The oil level might be too high (in this case, maintain the oil at the correct level), the hole in the oil filling cap could be blocked (in this case, check and clean it), or the piston ring and/or cylinder might be worn or damaged (in this case, use an authorized service center to check and repair if necessary).
  • J
    Jesse CoxAug 18, 2025
    Why is my GMC AC24L vibrating so much?
    • J
      Jared JonesAug 18, 2025
      If your GMC Air Compressor is making abnormal noises or vibrating excessively, this could be due to a loose part, a foreign body in the main compressor, the piston connecting with the valve seat (in this case, use an authorized service center to increase the size of the gasket), or excessively worn moving parts. For all of these issues, it's recommended to use an authorized service center to check and carry out the necessary repairs.
  • J
    Jeffrey RandallAug 25, 2025
    How to fix a sticking GMC AC24L Air Compressor?
    • R
      Richard PerkinsAug 25, 2025
      If the main compressor of your GMC Air Compressor is sticking or tight, it could be because moving parts have been damaged by heat due to insufficient lubrication, or because moving parts have been damaged or blocked by a foreign particle. In either case, it's recommended to use an authorized service center to check components like the crankshaft, bearings, con rod, and piston rings, replacing them where necessary.

Summary

Warning Labels Explained

Critical Pre-Operation Warnings

Covers initial oil filling, automatic start, and high voltage hazards requiring immediate attention.

Operational Safety Notices

Includes warnings on air suitability, daily tank draining, and filter maintenance.

General Safety Instructions

Workplace Safety

Covers keeping the work area clean, secure, and well-lit, and keeping visitors away.

Personal Safety

Emphasizes correct dress, use of safety accessories, and avoiding overreaching.

Tool Handling & Maintenance

Includes not forcing tools, using correct tools, securing workpieces, and tool care.

Power Cord & Electrical Safety

Warns against power cord abuse, unintentional starting, and using correct extension cords.

Additional Safety Rules for Air Compressors

Electrical and Environmental Hazards

Covers voltage matching, avoiding wet conditions, and fire/explosion risks from flammable liquids.

Operational Safety Precautions

Includes warnings on inhaling air, welding proximity, and proper shutdown procedures.

Pressure and Component Safety

Advises checking tool pressure ratings and avoiding operation with removed safety shields.

Spraying Material Safety

Recommends reading container labels and using a respirator mask when spraying materials.

Know Your Product Components

Controls and Gauges

Identifies key controls like the on/off switch, regulating knob, and pressure gauges.

Air Outlets and Valves

Identifies the direct/regulated outlet valves and the non-return valve.

Tank and Mobility Features

Identifies the air tank, wheels, and drain cock.

Safety and Maintenance Components

Identifies safety valve, filter assembly, oil cap, and level glass.

Unpacking and Initial Setup

Handle and Wheel Assembly

Instructions for assembling the handle and fitting the wheels to the compressor.

Rubber Feet Installation

Guidance on fitting the rubber feet onto the compressor bracket.

Critical Oil Filling Procedure

Step-by-step instructions for filling the compressor with oil before first use.

Air Filter Installation

Fit Air Filter Assembly

Step-by-step guide to removing the plug and screwing in the air filter assembly.

Pre-Start and Operation Procedures

Pre-Start Routine Checks

Steps including location check, oil/filter verification, and opening valves.

Starting and Stopping the Compressor

Instructions for checking voltage, connecting power, and operating the on/off switch.

Initial Run-In Procedure

Procedure for running the compressor unloaded for 10 minutes to lubricate parts.

Compressor Operation

Pressure Regulation and Control

Explains pressure switch function, factory settings, and how to adjust regulated output.

Connecting and Using Accessories

Details on connecting tools to outlet valves and reading gauges accurately.

Safe Shutdown Procedure

Comprehensive steps for turning off the compressor and releasing tank pressure.

Key Operational Warnings

Lists critical warnings including pressure hazards, electrical safety, and avoiding extension cords.

Troubleshooting Common Issues

Motor Performance Problems

Addresses motor not running, slow running, or overheating with causes and remedies.

Compressor Sticking or Noise

Covers issues like main compressor sticking and abnormal vibrations or noise.

Pressure and Oil Consumption Issues

Troubleshooting for insufficient pressure and excessive oil consumption.

Maintenance and Safety Checks

Lubrication and Oil Changes

Details initial and subsequent oil changes, including oil type recommendations.

Daily Maintenance Tasks

Includes draining condensate and checking the safety valve daily.

Air Filter Maintenance

Guidance on regularly checking and replacing the air filter cartridge.

Safety Valve Testing Warnings

Critical safety instructions and warnings for testing the safety valve.

General Inspection and Cleaning

Inspection and Cord Safety

Regular checks of fixing screws and the supply cord for damage.

Cleaning Procedures

Instructions for cleaning air vents, body, and moving parts, avoiding harsh chemicals.

Repair Information

Authorized Service Only

States that repairs and cordset replacements must be done by an authorized service centre.

GMC AC24L Specifications

General IconGeneral
BrandGMC
ModelAC24L
CategoryAir Compressor
LanguageEnglish

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