Saylor-Beall 705 Two-Stage Air Compressor Bare Pump | 3-5 HP, 17.3 CFM

The Saylor-Beall 705 is a two-stage, splash-lubricated cast iron bare pump built in St. Johns, Michigan. It delivers 17.3 CFM at 175 PSI (23 CFM piston displacement) at 845 RPM and is sized for a 3 to 5 HP motor. The flywheel is included.

This is the bare pump only. It does not include a motor, tank, pressure switch, belt, or belt guard.

Specifications

Model	705 (standard) or UL-705 (with head unloaders)
Type	Two stage, splash lubricated bare pump
Motor range	3 to 5 HP
Delivered air	17.3 CFM at 175 PSI
Piston displacement	23 CFM
Maximum pressure	175 PSIG
Speed	845 RPM maximum, 400 RPM minimum
Cylinders	2, inline, finned cast iron
Bore	4-1/8 in low pressure, 2-1/8 in high pressure
Stroke	3-1/2 in
Flywheel	16-3/4 in, included
Oil capacity	4 pints, ISO 150 / ASTM 700 compressor oil
Net weight	197 lb
Boltdown	9 in wide by 7-3/4 in deep
Origin	Made in USA

Standard 705 or UL-705 with head unloaders

Both versions ship with Saylor-Beall's centrifugal unloader as standard equipment. That is the device that vents head pressure when the pump stops so the motor restarts under no load. The head unloaders are the only difference between the two part numbers:

• 705 standard. The right pump for the large majority of shop systems, which start and stop off a pressure switch.
• UL-705 with head unloaders. Holds the heads open so the pump keeps turning unloaded once the system reaches pressure instead of shutting off. This is for continuous-run systems using a constant speed control and a pilot valve. It is not a drop-in upgrade on a start/stop system and normally needs additional controls.

If you are replacing a pump that is already in service, match the configuration you have now. If you are not sure which one that is, call us at 864-894-1400 or send a photo of the pump and we will identify it.

Construction

• Cast iron crankcase, cylinders and heads
• Two inline cylinders with a finned cast iron intercooler between stages
• Precision honed cylinders for oil control and efficiency
• Disc type valves, serviceable from the top of the head without pulling the pump
• Connecting rods with replaceable insert bearings
• Tapered roller main bearings on a ductile iron crankshaft
• Side plate for crankshaft and rod access

What it replaces

The 705 is the factory replacement pump for Saylor-Beall 705-series compressors, including the VT-735 and other 5 HP vertical and horizontal tank units. Within the same 700 Series family, the 703 covers 1.5 to 2 HP and the 707 covers 7.5 to 10 HP. Pressure-lubricated versions carry a PL prefix (PL-705) and are a different pump, not interchangeable with this one.

Oil and setup

Fill with 4 pints of ISO 150 or ASTM 700 industrial compressor oil before starting. Saylor-Beall calls for an oil change at least every three months. All four feet must be shimmed and firmly supported, and the pump needs at least 18 inches of clearance between the flywheel and any wall so the fan can pull cooling air across the cylinders.