Installation
Hydraulic-Powered Pumps
•Reference numbers and letters in parentheses in the text refer to numbers and letters in the illustra- tions.
•FIG. 3, page 11, shows a typical installation of an hydraulic-powered pump. It is only a guide. Contact your Graco distributor for actual system designs.
•Be sure all accessories, including hydraulic lines and fluid lines, are adequately sized and pres- sure-rated to meet system requirements.
•Use only electrically conductive hoses. Fluid hoses must have spring guards on both ends.
NOTICE
The Hydraulic Power Supply must be kept clean at all times to avoid damage to the motor and hydraulic power supply.
Blow out hydraulic lines with air and flush thoroughly before connection to the motor.
Plug hydraulic inlets, outlets, and line ends when dis- connecting them for any reason.
Always plug the hydraulic inlets, outlets and lines when disconnecting them for any reason to avoid introducing dirt and other contaminants into the system.
Be sure that your hydraulic power supply is equipped with a suction filter to the hydraulic pump and a system return line filter of 10 micron size. Carefully follow the manufacturer's recommendations on reservoir and filter cleaning and periodic changes of hydraulic fluid.
NOTE: Hydraulic fluid is exhausted from differential hydraulic motors only on the upstroke of the operating cycle. The oil return line must have at least twice the flow capacity as the oil supply line. Otherwise, back pressure on the hydraulic motor piston will slow down the motor and the fluid displacement pump, resulting in a loss of pump performance.
On the hydraulic oil supply line (D), install a shutoff valve
(E)to isolate the system for servicing; a fluid pressure gauge (J) to monitor hydraulic oil pressure to the motor and avoid overpressurizing the motor or displacement pump; a pressure- and temperature-compensated flow control valve (H) to prevent the motor from running too fast; a pressure reducing valve (K) with a drain line (M) running directly into the hydraulic return line (T); and an accumulator (L) to reduce the hammering effect caused by the motor reversing direction.
On the hydraulic return line (T), install a shutoff valve (S) for isolating the motor for servicing.
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