Maxon GPTLR Series - Relief Valve Pressure Adjustment - Power down

11921 Slauson Ave. Santa Fe Springs, CA. 90670 (800) 227-4116 FAX (888) 771-7713
53
RELIEF VALVE PRESSURE ADJUSTMENT - POWER DOWN
NOTE: The relief valve pressure is set at the factory; however, if a pressure check
shows incorrect reading, use the following procedure to set the pressure to
the correct reading.
Keep dirt, water and other contaminants from entering the hydraulic system.
Before removing hydraulic lines, clean up contaminants that can get in the
openings. Also, protect the openings from accidental contamination during
maintenance.
CAUTION
PORT G
ADJUSTING RAISING RELIEF VALVE
(POWER DOWN POWER UNIT)
FIG. 53-2
INSTALLING PRESSURE GAUGE
(GRAVITY DOWN POWER UNIT)
FIG. 53-1
PRESSURE
GAUGE
RESERVOIR
(PUMP INLET FILTER INSIDE)
RELIEF VALVE
COVER
RELIEF VALVE
ADJUST SCREW
PRESSURE
GAUGE
RESERVOIR
(PUMP INLET FILTER INSIDE)
1. Lower platform to the ground.
2. Remove plug from gauge port (FIG. 53-1).
Attach 0-4000 PSI pressure gauge in the
gauge port G (FIG. 53-1).
5. After adjustments are complete, remove
gauge (FIG. 53-1). Then, reinstall relief
valve cover (FIG. 53-2).
3. Remove cover for access to relief valve
(FIG. 53-2).
4. Hold the control switch in the “UP” position.
Slowly adjust the relief valve until the gauge
reads 2750 PSI (FIG. 53-2).