Controlled Products Systems Group HRG 220-A ST - Manual (Page 75)

Installation and Maintenance Manual
61
Pressure Relief Valves Adjustment Procedures
To check your relief valve setting, first disconnect the hoses. Run the operator either open or closed (the
gate will not move with the hose disconnected. The relief valve is found on the rear of the hydraulic
power unit. It has an adjusting head and lock nut. To adjust, loosen the lock nut and screw the threaded
bolt clockwise for increased pressure, counterclockwise to decrease pressure.
MODEL FACTORY RELIEF SETTING
SwingRiser (HRG 220 ST) 1350 PSI
SwingRiser Twin (HRG 222 ST) 1350 PSI
There is only limited value in using the relief valve as an entrapment protection device. Photo Eyes or
gate edges are the best methods to protect pedestrians and maintain reserve power to reliably drive the
gate.
Maintenance Schedule
Swing Gate Operator Maintenance Schedule
Name of part
What to do Check at these recommended monthly intervals
1 3 6 12 60
Gate and Hardware Check for damage *1 X
Gate post Check for excessive wear *2 X
Anchor bolts Check for tightness *3 X
Support post Check for movement *4 X
Limit Switches Check normal function *5 X
Fluid level Check for loss of fluid *6 X
Hydraulic fluid Drain and replace fluid *7 X
Clock Battery Replace *8
Motor Brushes (DC Only) Replace *9 X