Quincy QTS Series - User Manual

Questions and Answers

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Jesse RobertsonAug 17, 2025
Why is my Quincy QTS Compressor using too much oil?
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  Rachel BergerAug 17, 2025
  If there's excessive lubricant consumption or excessive lubricant in the hose of your Quincy Compressor, here are some potential causes: * The crankcase might be overfilled with lubricant. Drain the lubricant and refill to the proper level with the correct lubricant. * Lubricant leaks. Tighten the bolts on the compressor to the proper torque or replace the gaskets. * Worn piston rings. * The wrong lubricant viscosity. Drain the lubricant and refill with the proper lubricant. * The compressor is on an unlevel surface. Level the compressor. * A scored cylinder. * A plugged crankcase breather. Clean or replace the crankcase breather.
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Charles BishopAug 26, 2025
Why is my Quincy Compressor motor humming or running slowly?
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  Kevin SmithAug 26, 2025
  If the motor hums or runs slowly when you first turn on your Quincy Compressor, consider the following: * A light-duty extension cord might be in use. Use an additional hose instead of an extra extension cord, or use a heavier gauge extension cord. * There could be a loose electrical connection. Repair any loose electrical connections. * Low voltage could be the cause. Check the voltage with a voltmeter. * The motor might be sized incorrectly. Replace it with a correctly sized motor. * A defective motor could be the problem. Replace the motor. * The motor voltage may not match the power source voltage. Change the power cord and motor voltage to match the power source.
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Robert BrownAug 28, 2025
How to fix insufficient pressure in my Quincy QTS?
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  phillipsandersAug 28, 2025
  If you're experiencing insufficient pressure at the tool or accessory with your Quincy Compressor, consider these potential causes: * Leaks or restrictions in the hose or piping. Check for any leaks or restrictions and repair them. * A restricted air intake (filter plugged). Clean or replace the filter. * A slipping belt. Tighten the belt. * Hose or hose connectors that are too small. Replace them with larger ones. * A compressor that is incorrectly sized. Either use a smaller tool or a larger compressor. * A regulator not turned up to a high enough pressure or a faulty regulator. Turn the regulator to the proper setting or replace the faulty regulator.
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Tiffany ReyesAug 30, 2025
Why is my Quincy QTS Compressor so loud?
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  April RichardsonAug 31, 2025
  If your Quincy Compressor is operating noisily, here are some possible reasons: * Lack of lubricant in the crank-case. Check for possible damage to bearings and add lubricant. * Loose pulley, flywheel, belt, compressor or motor fasteners, belt guard, clamps, or accessories. Tighten them where necessary. * Carbon deposits on the piston or valves. Remove the cylinder head and inspect for foreign matter on top of the piston; clean it. * Worn main bearings, broken piston, worn wrist pins, wrist pin bearings, or a loose connecting rod bolt.
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Alejandro WilkersonSep 2, 2025
What causes a Quincy Compressor tank to lose pressure quickly?
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  Jennifer PhillipsSep 2, 2025
  If the tank loses pressure rapidly when your Quincy Compressor shuts off, it could be due to: * A loose connection or leak (pipe, tank drain valve, tubing, fitting, or hose). Turn the unit off, unplug it, and tighten or replace the fittings or components. * A faulty check valve. Replace the faulty check valve.
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hpaceSep 5, 2025
Why is my Quincy QTS Compressor vibrating so much?
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  Ashley GonzalezSep 5, 2025
  If your Quincy Compressor is experiencing excessive vibrations, here are a few things to check: * Pulley & flywheel misaligned or loose. Realign or tighten the pulley and flywheel. * Bent crankshaft. * Belt loose. Tighten the belt. * Compressor unit bolted to an uneven surface or not bolted down at all (stationary models). Shim to level the surface and fasten to the floor if possible.
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Shelby EllisSep 8, 2025
How to reduce moisture in the air from my Quincy Compressor?
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  Justin ValentineSep 8, 2025
  If you notice moisture in the discharge air of your Quincy Compressor, it's likely due to condensation in the tank, caused by a high level of atmospheric humidity or because the compressor isn't run long enough. To address this, drain the tank after every use, drain the tank more frequently in humid weather, and use an air line filter.
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grayrobertSep 12, 2025
Why does my Quincy QTS run continuously?
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  james13Sep 12, 2025
  If your Quincy Compressor unit runs continuously, it may be due to: * A defective pressure switch. Replace the defective pressure switch. * The compressor being incorrectly sized. Limit the air pressure to the compressor’s capacity, or use a smaller tool or a larger compressor.
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Kyle CaldwellSep 13, 2025
What does milky oil in my Quincy QTS mean?
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  Todd WilliamsSep 13, 2025
  If the crankcase lubricant in your Quincy Compressor appears milky, it indicates water in the lubricant due to humidity or condensation. Change the lubricant and move the compressor or air inlet to a less humid atmosphere.
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Tyler AndersonNov 18, 2025
How to troubleshoot a Quincy QTS Compressor that won't turn on?
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  Amanda TaylorNov 18, 2025
  If your Quincy Compressor won't operate, there are several possible causes: * The power cord might not be plugged in. Ensure it is properly plugged in. * The auto/off switch might be in the “off” position. Switch it to “auto”. * The motor overload relay may have tripped. Turn the auto/off switch to the “off” position, push the motor thermal overload (red) button firmly until a click is heard, and then turn the auto/off switch to “auto”. * A fuse might be blown, or the circuit breaker tripped. Replace the fuse or reset the circuit breaker. * There might be a defective pressure switch or motor. Replace or repair the pressure switch or motor. * The compressor may lack lubricant. Add lubricant. * The belt could be too tight or too loose. Adjust the belt. * The motor voltage mi...

Summary

Instruction Manual

Safety

DANGER!

Immediate hazards resulting in severe personal injury or death.

WARNING!

Hazards or unsafe practices resulting in personal injury or death.

CAUTION!

Hazards or unsafe practices resulting in minor personal injury or property damage.

Description & Application

Installation

Electrical Information

Overload Relay Protection

System Components

Pressure Relief Valves

Compressor Controls

Start;Stop

Manually Draining An Air Tank

Pre-Starting Checklist

Starting & Stopping the Compressor

Constant Run Models

Maintenance

Maintenance Schedule

Lubrication

Belt Alignment & Adjustment

Pilot Valve Adjustments

Setting Unload Pressure

Setting Differential Pressure

Troubleshooting

Maintenance Schedule Checklist

Quincy QTS Series Specifications

General

Maximum Pressure	175 PSI
Airflow @ 175 PSI	18-2, 200 CFM
Model	QTS Series
Air Delivery	18-2, 200 CFM
Operating Pressure	145-175 PSI
Drive Type	Belt Driven
Cooling Method	Air Cooled
Voltage	208v, 230v, 460v, 575v / 3 Phase