Harbor Freight Tools 67697 operating instructions Installation, Pump Pulley onto the Crankshaft

3. Apply a thin layer of grease to the hole

and keyway, then, with the indented side

Pump Pulley

of the Pulley center facing you, align

the keyway with the Woodruff Key (52)

and slide the Pump Pulley (59) over the

Crankshaft.

WARNING! Do not force or hammer the

Pump Pulley Dia: 12.5”

Motor Pulley

Pump Pulley onto the Crankshaft.

4.Slide the Spring Washer (61) and Washer (60) onto the Bolt (62) and insert the Bolt through Pump Pulley and thread into the Crankshaft. Tighten using a wrench (not included).

Note: The Bolt is a left-hand thread. To fasten, turn Bolt counterclockwise.

Installation

Note: Depending on your level of expertise, you may wish to have a qualified technician perform this installation.

CAUTION: Avoid damage to the Air Compressor Pump and other equipment. The Compressor Pump mounting platform should be flat, level, and strong enough to support the combined weight of the Pump, electric motor or engine, and related hardware and equipment. It must also be capable of withstanding the vibration and tension of the drive belts. It must incorporate easy access to the Oil Drain Plug (48).

1.Place the Air Compressor Pump on the mounting surface at the same level as the 3 HP motor used to drive it.

Note: Use a motor with the appropriate size pulley to get the needed Pump RPM. For most applications it is recommended to run this unit at the lower RPM.

Calculation for Motor Pulley:

8,187.5			Motor
(12.5” Pump Pulley Dia. x 655 Pump RPM)
		=	Pulley
	Motor RPM
			Dia.

To calculate the motor and motor pulley needed to power the pump, multiply the Pump Pulley diameter (12.5”) times the pump working RPM (655), then divide by the engine RPM. This will determine the motor pulley diameter (in inches) needed to run the unit.

For example: If you have a 1725 RPM motor, to calculate the pulley diameter needed, multiply 12.5 x 655, then divide by 1725, which equals the motor pulley size of 4.75”. Use the pulley size closest to this figure.

8,187.5 = 4.75”

1725

Or, use the following equation if you have a 3450 RPM motor:

8,187.5 = 2.37”

3450

2.The 12-1/2 inch V-groove Pump Pulley (59) must be in perfect alignment with the motor pulley (not included).

Note: Ensure the Pump Pulley is installed for counter-clockwise rotation when facing the pulley side of the Pump.

CAUTION: Misalignment between the Motor and the Pump can cause damage to both the motor and the compressor pump. Use a straight edge, such as a yardstick, to check and adjust alignment as needed.

SKU 67697 For technical questions, please call 1-800-444-3353. Page 9