Installation Guide
Tools Needed:
- Adjustable wrench set
- Level
- Screwdrivers (flat and Phillips)
- Pipe wrench
- Pressure gauge
- Teflon tape
Step-by-Step Installation
- Choose Installation Location: Select a well-ventilated area with solid, level concrete flooring and adequate clearance for maintenance access.
- Foundation Preparation: Ensure the foundation can support the compressor's weight and vibration. Use vibration pads if installing on non-concrete surfaces.
- Electrical Connection: Connect to appropriate power supply (see specifications). All electrical work must comply with local codes and be performed by a qualified electrician.
- Air System Connection: Install proper air lines using recommended piping materials. Include a main shut-off valve and drain legs in the piping system.
- Oil Check: Verify oil level is at proper mark on sight glass before initial startup.
- Pressure Settings: Set cut-in and cut-out pressures according to application requirements.
- Initial Startup: Perform initial startup without load, then gradually increase to full operating pressure while checking for leaks.
Specifications
| Model Series | QT-370 |
| Type | Two-Stage Reciprocating Air Compressor |
| Power Source | Electric / Gasoline Options |
| Horsepower | 7.5 HP |
| Air Delivery (CFM) | 24.1 CFM at 175 PSI |
| Maximum Pressure | 175 PSI |
| Tank Capacity | 80 Gallons (Vertical) |
| Noise Level | 78 dB(A) at 1 meter |
| Power Requirements (Electric) | 230V, 60Hz, 30A (Single Phase) |
| Dimensions (HxWxD) | 72 x 36 x 42 inches |
| Weight | 580 lbs (Empty) |
| Pump Type | Two-Stage, Cast Iron |
Warranty Information
- Full Warranty: 2 years parts and labor
- Pump Warranty: 5 years on cast iron pump
- Tank Warranty: Lifetime limited warranty on ASME tank
- Additional Coverage: Optional extended service plans available
For warranty service, contact Quincy Compressor Customer Service at 1-800-321-7000 or visit QuincyCompressor.com
Key Features
Two-Stage Compression
Delivers higher efficiency and cooler operation by compressing air in two stages, reducing moisture accumulation and increasing overall system reliability.
Cast Iron Construction
Heavy-duty cast iron pump and components provide superior heat dissipation, extended service life, and reduced maintenance requirements.
Pressure Lubricated Pump
Full pressure lubrication system ensures proper oil distribution to all critical components, reducing wear and extending pump life.
ASME Certified Tank
80-gallon ASME certified air receiver tank with safety valve and drain system for reliable, safe operation.
Thermal Protection
Built-in thermal overload protection prevents motor damage from overheating during extended operation or high ambient temperatures.
Low RPM Operation
Operating at lower RPMs reduces wear, noise, and heat generation while maintaining high air delivery efficiency.
Performance Specifications
Air Delivery
24.1 CFM at 175 PSI for continuous tool operation
Duty Cycle
100% duty cycle for continuous industrial operation
Pressure Range
Adjustable from 100-175 PSI for various applications
Recovery Time
Full tank recovery in under 3 minutes at 175 PSI
Oil Capacity
2.5 quart sump with easy-access fill port
Cooling System
Integrated cooling fins and fan for optimal heat dissipation
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Compressor won't start | Power issue, pressure switch fault, thermal overload tripped | Check power supply, reset thermal overload, inspect pressure switch |
| Low air pressure | Air leaks, worn valves, intake filter clogged | Check for leaks, inspect valves, clean or replace air filter |
| Excessive noise/vibration | Loose components, worn bearings, improper mounting | Tighten all fasteners, check bearings, ensure proper installation |
| Overheating | Low oil, dirty cooling fins, high ambient temperature | Check oil level, clean cooling fins, improve ventilation |
| Oil in air lines | Worn piston rings, overfilled oil, wrong oil type | Check piston rings, adjust oil level, use recommended oil |
| Excessive moisture | Faulty drain valve, high humidity, inadequate aftercooling | Check drain valve operation, install air dryer, ensure proper drainage |
Common Error Indicators
- Red Oil Light: Low oil pressure - Check oil level and pump immediately
- Thermal Overload Trip: Motor overheating - Allow cool down, check ventilation
- Pressure Switch Failure: Compressor won't cycle - Inspect pressure switch and contacts
- Unloader Valve Issue: Hard starting - Check unloader valve operation
- Belt Problems: Slipping or squealing - Adjust tension or replace belt
- Check Valve Issue: Air leaking back - Inspect and replace check valve if necessary
Manual Downloads
Current Model Manuals
QT-370
7.5HP Two-Stage Industrial Compressor
QT-370E
7.5HP Electric Version
QT-370G
7.5HP Gasoline Version
QT-370V
Vertical Tank Configuration
Related Models
QT-250
5HP Two-Stage Compressor
QT-540
10HP Industrial Compressor
QR-370
Rotary Screw Version
QP-370
Portable Version with Trailer