Principles Of Lubrication Systems; Principles Of Cooling Systems; Principles Of Dryers & Filters - Quincy Compressor QR-25 Series Instruction Manual

Principles of Lubrication Systems

Principles of Cooling Systems

Principles of Dryers & Filters
QR-25 Series
52201-105, May 2003
Splash Lubricated Models
With each stroke of the compressor, a dipper attached to the bottom of the
connecting rod , dips into an oil bath at the bottom of the crankcase. This dipper
splashes oil throughout the interior of the crankcase, lubricating all moving
parts.
It is important with this system that the oil level be maintained between the
high and low level marks on the dipstick. If the oil level is too high, excessive
oil carryover could result. If the oil level is too low, or the compressor is not
operated within the correct RPM range, the moving parts will not be ad-
equately lubricated.
Pressure Lubricated Models
Moving parts within the crankcase are supplied with lubrication by a positive
displacement, gerotor type oil pump. Oil is drawn up from the bottom of the
crankcase to the oil pump through an oil sump strainer screen. The oil is then
forced under pressure through the oil filter (if so equipped). Oil travels under
pressure through drilled journals in the crankshaft and connecting rods to
lubricate crankshaft bearings, wrist pin bearings and the cylinder walls.
Aircooled Models
Fan blades of the compressor sheave force ambient air across fins of the
cylinder head(s), and intercooler fins of two stage compressors, to cool the
compressor. QR-25 series compressors are normally set up at the factory with
a sheave that turns in a counterclockwise rotation. For special applications,
clockwise rotation compressor sheaves are available as optional equipment on
some models. Due to standard drive motor limitations, it is recommended that
the compressor be operated in temperatures under 104°F.
Watercooled Models
In addition to cooling action provided by the fan blades of the compressor
sheave, cool water is circulated throughout an internal water jacket surround-
ing the cylinders and heads of watercooled models.
Moisture occurs naturally in air lines as a result of compression. Moisture
vapor in ambient air is concentrated when pressurized and condenses when
cooled in downstream air piping. Compressed air dryers reduce the moisture
vapor concentration and prevent water formation in compressed air lines.
Dryers are a recommended companion to filters, aftercoolers, and automatic
drains for improving the productivity of compressed air systems.
Water and moisture vapor removal increases the efficiency of air operated
equipment, reduces contamination and rusting, increases the service life of
pneumatic equipment and tools, prevents air line freeze-ups, and reduces
product rejects.
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Quincy Compressor
3501 Wismann Lane, Quincy IL - 62305-3116