Barko Hydraulics 495B SD - Hydraulic Pressure Adjustments

Operation and Maintenance Manual
495B ML TM (S)
37
Last Updated - 08/31/2016
ADJUSTING WORKING PRESSURE (3600 PSI) AND STANDBY PRESSURE (425 PSI)
Standby pressure
Pump compensator
Torque Control
1. Install an electronic (digital) gauge on the system pressure test port (which is located on the main control
valve).
NOTE: When setting standby pressure, pressure will spike to approx. 3600 PSI before reading 425 PSI. This
will 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. Adjust
pressure by turning screw in or out with a 5/32" allen wrench. Retighten jam nut prior to taking pressure
reading.
 4. Installa5000PSIgaugeonthesystempressuretestport(locatedontherewall,orthePXportonthe
upper control valve).
5. With engine at low throttle, bottom out the main boom (up) or stick boom (in or out) and set the system
pressure on the compensator screw to 3600 PSI (turn screw clockwise to increase, counterclockwise to
decrease).
The torque control is factory set and generally will not require adjustment. Turning the screw in (clockwise) will
increase the load on the engine by holding the pumps on stroke at a higher pressure.
HYDRAULIC PRESSURE ADJUSTMENTS
PUMP ADJUSTMENTS (A11VLO-145)