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Barko 495B - SE Service Manual
Also see for 495B - SE: Operator's manual
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Service Manual495B SE (S)37Last Updated - 9/28/2016PUMP ADJUSTMENTS (AA11V-095)ADJUSTING WORKING PRESSURE (3600 PSI) AND STANDBY PRESSURE (425 PSI)Note: When setting the working pressure and standby pressure on a double pump system the two pumps must beset at equal pressures for optimal efficiency. The pressure readings from the pump output test port, or thesystem pressure output test port is the highest pressure from the either pump. To set both pumps equally,increase one of the blocks to the proper setting. Now increase the other block such that the gauge readsabove the proper setting to ensure it is the one giving the reading, now back down the pressure to the properreading. If the proper setting can not be obtained this way the pumps will have to be isolated and adjustedindependently. Remove one pump at a time from the system by removing the load sense line from theopposite pump to be adjusted. Tighten a JIC plug to the tee, LOOSELY screw on a cap to the pump to keepdirt and dust out (if cap is to tight it will add to system pressure). Adjust pressures and reconnect hoses.Repeat for other pump.Standby pressurePump compensatorTorque Control1. Install an electronic (digital) gauge on the system pressure test port (which is located on the main controlvalve).NOTE: When setting standby pressure, pressure will spike to approx. 3600 PSI before reading 425 PSI. Thiswill ruin a 1000 PSI gauge. Use an electronic (digital) gauge to check standby pressure.2. With engine at low throttle, set standby pressure to 425 PSI (turn screw clockwise to increase,counterclockwise to decrease).3. To adjust pressure, loosen jam nut on pressure control block located on pump with 1/2" wrench. Adjustpressure by turning screw in or out with a 5/32" allen wrench. Retighten jam nut prior to taking pressurereading.4. Install a 5000 PSI gauge on the system pressure test port (located on the fire wall, or the PX port on theupper control valve).5. With engine at low throttle, bottom out the main boom (up) or stick boom (in or out) and set the systempressure on the compensator screw to 3600 PSI (turn screw clockwise to increase, counterclockwise todecrease). |
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