Quincy Compressor QT / QT Pro Two-Stage Recip

QT-5, QT-7.5, QT-10, QT-15, QT-25

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Quincy Compressor QT / QT Pro Two-Stage Recip

Two-stage cast-iron reciprocating pump platform, 5–25 hp. Belt-driven, air-cooled, oil-lubricated.

Type
Two-stage reciprocating
Power
5–25 hp
Flow
17–91 cfm @ 175 psig
Pressure
175 psig max
Cooling
air
Drive
belt
Lubrication
oil-lubricated
Models
QT-5, QT-7.5, QT-10, QT-15, QT-25
Years produced
QT platform in production since 1970s; QT Pro branding since 2010s.
Sound level
~78–84 dB(A) @ 1 m open frame.
Dimensions
80-gal vertical: ~32"×32"×80"; 120-gal horizontal: ~78"×27"×48".
Weight
80-gal QT-5 ~650 lb; 120-gal QT-15 ~1,050 lb.
Ambient range
40–104 °F ideal.
Motor efficiency
TEFC industrial; often 1.15 SF.
Starter
Pressure switch + starter; constant-speed unloader kit optional.
Warranty
Quincy Champion pump warranty — up to 10 years on splash-lube pumps under conditions.
Control modes
  • Start/Stop
  • Continuous Run w/ Unloader
Typical applications
  • Auto shops
  • Farms
  • Small manufacturing

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: Quincy QuinSyn PG or QuinSyn Plus (synthetic)
Capacity: See nameplate — typically 1.75–4 qt
Change interval: 2,000 hr on QuinSyn, 500 hr on mineral
Approved alternatives
  • ISO 100 non-detergent mineral (short interval)
Torque guidance

Head bolts torqued in cross pattern to OEM spec sheet; flywheel torque per model. Belt: ½" deflection midspan.

Always verify torque values against the OEM service manual for the specific serial number.

Wear parts
CategoryIntervalSource
Inlet filter element500 hr or annually
Reed valve setInspect 2,000 hr
V-belt setAnnual inspect
Piston rings & wristpin6,000–8,000 hr
Head gasket kitWith each top-end
Check valveInspect at PM
Safety valveTest annually

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 (per head)
OEM
110377E100, 2013400114
Aftermarket
  • 245P— Solberg
  • P776386— Donaldson
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.
  • 245P— SolbergLikely
    source
    Poly element replacement.
  • P776386— DonaldsonLikely
    source
Drive belt
V-belt set
OEM
2013400708
Aftermarket
  • BX56— Gates
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.
  • BX56— GatesLikely
    source
    Verify sheave PD; QT-5 uses BX48.
Lubricant
QuinSyn F (food-grade) / QuinSyn Plus
OEM
112857GL010
Aftermarket
  • Rarus 427— Mobil
  • PCK— Amsoil
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 427— MobilUnverified
    Petroleum equivalent.
  • PCK— AmsoilUnverified

Need to look up a number across all models? Use the parts cross-reference search.

Preventive maintenance
Daily
  • Check crankcase oil level
  • Drain tank moisture
  • Listen for valve tick / knock
  • Verify unloader operates on cut-out
Every 500 hr
  • Change crankcase oil (mineral) or verify PAO/synthetic at manufacturer interval
  • Clean or replace inlet filter
  • Check belt tension & sheave alignment
  • Torque head bolts to spec if any weeping
Annual / 2,000 hr
  • Pull head; inspect reed/disc valves and seats
  • Check ring gap and cylinder wear
  • Torque head bolts to OEM spec in cross pattern
  • Test safety valve
  • Inspect crankshaft & rod bearings on splash-lube units
Every 4–6,000 hr
  • Top-end rebuild (rings, valves, gaskets)
  • Inspect rod bearings and crank end play
  • Verify aftercooler condensate drain
Common faults & first checks
  • Slow to build past 150 psi — valve wear
  • Excessive interstage moisture — undersized aftercooler for duty
  • Belt squeal — sheave alignment or worn belts
  • Oil in air line — worn rings or overfilled crankcase
Known issues & field notes
  • Pressure-lube pumps require oil pump priming after long shutdowns
  • Aftermarket valve plates cause premature interstage moisture — use OEM Quincy
Strengths
  • Splash-lubricated or pressure-lubricated (frame dependent) with strong duty rating
  • Widely available parts
  • Long service life on synthetic fluid
  • Warranty stands behind pump
Weaknesses
  • Loud without enclosure
  • No integrated controller — pressure switch only
Field notes

QT-5/7.5 are splash-lubricated; QT-10/15/25 are pressure-lubricated with oil pump. Popular commercial-duty recip.

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