XLT-1571DC
4-6
Pressure Relief Valve Reset
Perform the following procedure to reset the pressure relief valve. Refer to Figure 4-3.
1. Disconnect the hydraulic hose from the main pressure port.
2. Install a 4000 psi gauge into the main pressure port in the pump unit.
CAUTION
Do not adjust the pressure relief valve higher than 2100 psi. Overloading may
occur at pressures greater than 2100 psi.
3. Remove the hex cover from the pressure relief valve.
4. While depressing the
WHEEL DOWN/BASE ROLLS pushbutton on the lower control
box, adjust the screw until maximum pressure of 2100 psi is obtained.
5. After adjusting the pressure relief valve, replace the hex cover, remove the 4000
psi gauge, and reconnect the hydraulic hose to the main pressure port.
6. If a gauge is unavailable, place 500 pounds on the platform and adjust the pres-
sure relief valve screw so that the load can just be lifted without bypassing oil
through the pressure relief valve.
HEX COVER FOR
PRESSURE
RELIEF VALVE
MAIN
PRESSURE
PORT
Figure 4-3. Pressure Relief Valve Adjustment
