Quincy Compressor QGS Rotary Screw
5–200 hp direct- or belt-drive oil-flooded rotary screw. Sequences up to 8 units natively via Power$ync.
Type
Oil-flooded rotary screw
Power
5–200 hp
Flow
17–1,020 cfm
Pressure
100–190 psig
Cooling
air-or-water
Drive
belt-or-direct
Lubrication
oil-flooded
Models
QGS 5–200 (Standard & VSD)
Years produced
QGS ~2005 – present; current-gen ~2016 after Atlas Copco integration.
Sound level
~65–75 dB(A) @ 1 m enclosed.
Ambient range
40–115 °F.
Motor efficiency
IE3 / NEMA Premium standard.
Integrated dryer
TM variants ship with integrated refrigerated dryer.
Warranty
5-year airend option.
Control modes
- Load/Unload
- VSD variants variable-speed
Typical applications
- Manufacturing
- Automotive
- General plant air
Specs & intervals below are from publicly published OEM literature and long-standing field practice. Torque values, exact revision-dated part numbers, and safety-critical settings vary by serial number — always cross-check the unit’s OEM manual and nameplate before ordering parts or performing service.
Fluid
Spec: QuinSyn F / QuinSyn Plus (per model chart)
Change interval: 8,000 hr
Approved alternatives
- Food-grade H1 available
Wear parts
| Category | Interval | Source |
|---|---|---|
| Air filter | 2,000 hr or ΔP | |
| Oil filter | 2,000 hr | |
| Separator element | 4,000 hr | |
| Coupling / belt inspection | Annually | |
| Motor bearings | Per motor plate |
Consumable part numbers change by revision and region — pull the current number from the OEM portal.
Parts cross-reference
OEM part numbers with commonly-cited aftermarket equivalents. Verify against the nameplate and OEM parts portal before ordering — dimensionally similar filters can still be wrong for the application.
Air filter
Air filter element
OEM
23545764
Aftermarket
- P828889— Donaldson
- PA2775— Baldwin
- SA 16060— Hifi
VerifiedConfirmed against a public OEM or aftermarket catalog / cross-reference tool at time of entry.LikelyCommonly cited in the vendor's cross tool or long-standing field usage; not independently re-verified against the current OEM parts list.UnverifiedDimensional lookalike or user-reported.
Oil / fluid filter
Oil filter
OEM
2258360002
Aftermarket
- P550425— Donaldson
- B7577— Baldwin
- LF3325— Fleetguard
VerifiedConfirmed against a public OEM or aftermarket catalog / cross-reference tool at time of entry.LikelyCommonly cited in the vendor's cross tool or long-standing field usage; not independently re-verified against the current OEM parts list.UnverifiedDimensional lookalike or user-reported.
Air-oil separator
Air-oil separator
OEM
2258290007
Aftermarket
- P532473— Donaldson
- OS 5223— Hifi
VerifiedConfirmed against a public OEM or aftermarket catalog / cross-reference tool at time of entry.LikelyCommonly cited in the vendor's cross tool or long-standing field usage; not independently re-verified against the current OEM parts list.UnverifiedDimensional lookalike or user-reported.
Lubricant
QuinSyn PLUS (PAO)
OEM
112857GL050 (5 gal)
Aftermarket
- Rarus SHC 1025— Mobil
- Cetus PAO 46— Chevron
VerifiedConfirmed against a public OEM or aftermarket catalog / cross-reference tool at time of entry.LikelyCommonly cited in the vendor's cross tool or long-standing field usage; not independently re-verified against the current OEM parts list.UnverifiedDimensional lookalike or user-reported.
- Rarus SHC 1025— MobilUnverified
- Cetus PAO 46— ChevronUnverified
PAO — not compatible with PAG (Ultra Coolant, Sullube).
Need to look up a number across all models? Use the parts cross-reference search.
Preventive maintenance
Daily
- Check fluid level in sight glass at running temp
- Listen for unusual noise / vibration
- Check discharge pressure & temperature vs baseline
- Verify condensate drain function
- Log package amps if metered
Weekly
- Blow down receiver and drain traps
- Check for oil carryover at first drop leg
- Inspect for fluid or air leaks around airend and separator tank
- Verify safety valve is not weeping
Every 2,000 hr / 6 mo
- Change fluid filter
- Change air filter (or sooner per ΔP)
- Sample fluid for TAN / metals / water
- Clean cooler exterior with low-pressure air (never > 30 psi against fins)
Every 4,000 hr / 12 mo
- Change separator element
- Change fluid
- Inspect scavenge line & orifice for coking
- Check coupling / belt alignment & wear
- Torque electrical lugs to spec (typ. 45–75 in-lb #4–2/0 AWG)
Every 8,000 hr
- Rebuild inlet valve
- Rebuild minimum-pressure check valve
- Regrease or replace motor bearings per OEM interval
- Verify safety valve setpoint against gauge
Common faults & first checks
- F01 airend temp high — cooler + thermal valve
- F05 separator ΔP
- Power$ync sequencing loss — check Modbus wiring & unit addresses
Known issues & field notes
- Post-Atlas-Copco parts crossover — verify OEM part number vs pre-2009 units
Controller(s)
- Quincy Power$ync II / III — Power$ync III: 4.3" color touch; Power$ync II: 4-line LCD.
Strengths
- Wide flow range in one product family
- Native sequencing on Power$ync
Weaknesses
- Post-Atlas-Copco acquisition parts crossover requires OEM verification
Field notes
QGS is Quincy's mainstream rotary screw. Since 2009 Quincy is an Atlas Copco brand — many mechanicals share GA DNA.