Jiffy-Drill

Hydraulic Power Unit:

The Jiffy-Drill operates from a separate hydraulic power unit. Pressure from the pump gives the Jiffy-Drill its torque. The power unit pump must furnish sufficient flow for the desired drilling RPM on the hydraulic motor and allow for proper feed rate of the drill.

A standard hydraulic power unit may be used, or a special power unit can be assembled for the job. To operate several Jiffy-Drills, a separate power unit can be used for each. Or two or more units can be run from 1 variable volume pressure compensated pump with pressure compensated flow controls sandwiched under each control valve. Set these flow controls to the flow required for your drilling speed. Also two drilling units can be supplied from a double pump, or several pump/motor combinations mounted on a common reservoir.

Several Jiffy-Drill hydraulic motors can be run in series if a line is run from the external drain port on each motor to reservoir. This is economical when running small drills where the hydraulic pressure on each motor is relatively low. The hydraulic motors must be specially ordered with an external case drain to run is series.

For protection against drill breakage, the relief valve on the hydraulic power unit should be a pilot-operated rather than a direct-acting type, and should be set to the minimum pressure, which will give full drilling speed under load.

If necessary, a heat exchanger should be included in the hydraulic power supply. Excessively high oil temperature significantly reduces the life of any equipment operated from the hot oil supply. It deteriorates the oil, causes seals to leak or to fail prematurely, and usually causes a speed or torque loss in the hydraulic motor from slippage as the oil becomes thin due to high temperature. A temperature in the range of 140° to 160°F is recommended, and the temperature should never exceed 160°F.

If the reservoir has sufficient oil capacity for the GPM pumping rate, a heat exchanger may not be needed to dissipate the heat.