The Ho-Pac’s high energy force is generated by a direct-coupled hydraulic motor rotating an eccentric mass at high RPM. For optimum performance it's vital that the motor is supplied with the correct amount of oil. It is equally important that the motor is not subjected to high back pressure. High back pressures can reduce the unit's efficiency and is also detrimental to the service life of components, particularly the motor shaft seal.
Back pressure levels can be classified as: low (below 50 psi), moderate (50 - 100 psi), and high (above 100 psi). When installing a Ho-Pac onto a carrier, a gauge must be installed in the return line. If the back pressure exceeds 100 psi, it is necessary to determine and remedy its cause.
High return pressure may be the result of a clogged oil filter, partially closed shut-off valve, damaged or worn quick disconnect couplers, undersized connectors, a long string of connectors, or insufficient return line diameter. Generally, the diameter of the hydraulic lines used to plumb a carrier should be consistent with those included with the Ho-Pac from Allied.
In some instances, it may be necessary to add a 1/4 inch or 3/8 inch diameter hose to the motor case drain port and plumb it directly back to the carrier's hydraulic tank. If you have questions about particular installations, contact the Allied Technical Service Department for assistance.
