Bil-Jax Personal Lift AERIAL WORK PLATFORMS Hydraulic Boom Lift ユーザーズマニュアル

Check and adjust the hydraulic bypass pressure for the basket or ground station boom 
controls as follows: 

1.  Connect a hydraulic pressure gage to the pressure test port. 

2.  Start the gasoline engine or DC motor. Run the engine or motor for at least five 

minutes to warm the hydraulic oil to the normal operating temperature. 

3.  Extend the outriggers to fully support and level the boom lift. 

4.  Turn the ground control station key switch to basket or ground position, accord-

ing to which bypass pressure (basket or ground control) is to be adjusted. 

5.  Push down the lower beam control lever at the basket or ground station and read 

the pressure gage. If the pressure gage reading is 2750 psig [190 bar (19 000 
kPa)] nominal, no adjustment is required. If an adjustment is required, proceed 
with step 6. 

6.  Press the emergency stop pushbutton to turn off the hydraulic pump. 

7.  Locate the bypass valve for the selected boom control valve bank. Remove the 

adjust screw cap. 

8.  Use screwdriver to turn the adjust screw. Turning the adjust screw 1/4 turn to 

the right will increase the pressure about 150 psig [10,4 bar (1 037 kPa gage)]. 

9.  Reinstall and tighten the adjust screw cap. Do not over tighten the cap. 

10.  Reset the emergency stop pushbutton and restart the engine or motor. 

11.  Push the upper or lower beam control lever down at the basket or ground station 

controls and read the pressure gage. If the bypass pressure is still too high or too 
low, repeat the adjustment starting with step 6. 

12.  If no other hydraulic pressures are to be checked, shut down the engine or motor 

and remove the pressure gage.