Chicago Pneumatic QRS Series
Small-frame direct- or belt-drive oil-flooded screw, 5–30 hp. Popular in body shops and light industrial.
Type
Oil-flooded rotary screw
Power
5–30 hp
Flow
17–120 cfm
Pressure
125–175 psig
Cooling
air
Drive
belt-or-direct
Lubrication
oil-flooded
Models
QRS 5–30 (fixed & VSD)
Years produced
QRS ~2010 – present. QRS 10-30 refresh ~2018.
Sound level
~65–70 dB(A) @ 1 m enclosed.
Dimensions
Base frame ~30"×26"×48"; tank packages up to 60 gal.
Weight
~500–1,200 lb depending on frame & tank.
Ambient range
40–115 °F.
Motor efficiency
IE3 TEFC standard.
Integrated dryer
T variants include tank + refrigerated dryer + filters in single skid.
Warranty
2-year package / 5-year airend option.
Control modes
- Load/Unload
- VSD variants speed-modulate
Typical applications
- Body shops
- Small manufacturing
- Light industrial
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: CP Roto-Inject Fluid (PAO)
Change interval: 4,000 hr
Approved alternatives
- Food-grade H1 fluid on request
Wear parts
| Category | Interval | Source |
|---|---|---|
| Air filter | 2,000 hr or ΔP | |
| Oil filter | 2,000 hr | |
| Separator element | 4,000 hr | |
| Drive belt (belt-drive variants) | Inspect 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
Intake filter
OEM
1622507400
Aftermarket
- P828889— Donaldson
- C 24 650/1— Mann-Filter
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
1622314280
Aftermarket
- P550425— Donaldson
- B7577— Baldwin
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
Separator element
OEM
1622314283
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
CP Roto-Inject / Roto-Xtend
OEM
6215722100
Aftermarket
- 801— Chemlube
- DSL-46— Summit
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.
- 801— ChemlubeUnverified
- DSL-46— SummitUnverified
Shares diester chemistry with Atlas Copco Roto-Xtend Duty.
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
- High discharge temp on hot days — cooler & thermal valve
- Separator ΔP at 4k hours
- CP Air Control comm loss with add-on dryer — check RS-485 termination
Known issues & field notes
- Belt-drive variants: sheave alignment key on cold restart
Controller(s)
- CP Air Control / CP Touch — CP Touch: 3.5"–5" color; CP Air Control: 4-line monochrome.
Strengths
- Compact tank+dryer package option
- Straightforward service
- Value pricing
Weaknesses
- Small dealer footprint vs IR/Kaeser in some regions
Field notes
CP is under the Atlas Copco umbrella; some sensor layouts mirror GA.