Harbor Freight Tools 67698 - Manual (Page 9)

Page 9 For technical questions, please call 1-800-444-3353. SKU 67698
Apply a thin layer of grease to the hole 3.
and keyway, then, with the indented side
of the Pulley center facing you, align
the keyway with the Woodruff Key (50)
and slide the Pump Pulley (58) over the
Crankshaft.
wArning! do not force or hammer the
Pump Pulley onto the Crankshaft.
Slide the Spring Washer (60) and
4.
Washer (59) onto the Bolt (61) 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 (36).
Place the Air Compressor Pump on the
1.
mounting surface at the same level as the 5
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:
Motor Pulley
Pump Pulley
Pump Pulley Dia:
14.5”
(14.5” Pump Pulley dia. x 655 Pump rPm)
motor rPm
9,497.5
=
motor
Pulley
dia.
To calculate the motor and motor pulley
needed to power the pump, multiply the
Pump Pulley diameter (14.5”) times the
pump working RPM (1050), 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 14.5 x 655, then divide
by 1725, which equals the motor pulley
size of 5.5”. Use the pulley size closest
to this figure.
9,497.5
1725
= 5.5”
Or, use the following equation if you
have a 3450 RPM motor:
9,497.5
3450
= 2.75”
2. The 14-1/2 inch V-groove Pump Pulley
(58) 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.