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Symptoms of poor performance.
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TM-9-6115-667-13P Power Unit Diesel Engine Driven 2 1/2 Ton Trailer Mounted 30 kw 50/60 Hz PU-803 Manual
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FIGURE 1.  Wiring Diagram
TM9-6115-667-13&P PROBLEM CAUSE REMEDY Low output. Hyrevz motor speed too slow. Check power unit for proper flow (7-9 gprn26-34 Ipm). Unbalanced or excessive load. Balance load between circuits. Load should not exceed rated capacity. High backpressure. Check hydraulic system for excessive backpressure (over 250 psi/l7 bar). Couplers or hoses blocked. Locate and remove restriction. Oil too hot (above 150°F/660C) Check hydraulic power source or too cold (below 50°F/100C). for proper oil temperature. Bypass cooler to warm oil or provide cooler to maintain proper temperature. Relief valve set too low. Adjust relief valve to 2100-2250 psi/145-155 bar. Hyrevz motor worn. Inspect and repair or replace. Output too high. Hyrevz motor overspeeding. Check power unit for proper flow (7-9 gpm/26-34 Ipm). Hydraulic Motor Generator Overloaded. Reduce electrical load.  Load overheats. should not exceed rated capacity. Air intake plugged or covered. Clean air intake. Windings covered with dirt. Clean windings. 14

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