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4 — MAINTENANCE
4-9
10. Use hex wrench to turn the pressure adjust screw. Turn the adjust screw right
for higher pressure or left for lower pressure. Turning the adjust screw 1/4 turn
will adjust the pressure about 150 psig [10,4 bar (1 037 kPa gage)].
11. Tighten the adjust lock nut.
12. Reset the emergency stop pushbutton and restart the engine or motor.
13. Pull up one outrigger control lever and recheck the system pressure. If the pres-
sure is still too high or too low, repeat the adjustment starting with step 6.
14. When the system pressure is properly adjusted, remove the cap from the outrig-
gers bypass valve (Figure 4-6). Turn the adjust screw to the left two turns.
15. Reinstall and tighten the adjust screw cap. Do not over tighten the cap.
Check/Adjust Outriggers Pressure
1. Pull up one outrigger control lever and read the pressure at the gage. If the gage
reading is 2750 psig [190 bar (19 000 kPa)] nominal, no adjustment is required.
2. If the outriggers pressure is too high or too low, remove the cap (Figure 4-6)
and adjust the pressure. Turning the adjust screw to the right 1/4 turn will raise
the pressure about 150 psig [10,4 bar (1 037 kPa gage)].
3. Reinstall and tighten the adjust screw cap. Do not over tighten the cap.
4. Repeat steps 1 through 3 as needed to properly adjust outrigger pressure.
5. If no other hydraulic pressures are to be checked, shut down the engine or motor
and remove the pressure gage.
Check/Adjust Boom Hydraulic Pressure
The hydraulic pressure for the basket station boom controls is regulated by a bypass
valve (Figure 4-7) at the front of the basket station valve bank. The hydraulic pressure
for the ground station boom controls is regulated by an identical valve at the back of the
ground station boom controls. The regulated pressure is used to extend and retract all
basket and boom positioning cylinders.
BYPASS VALVE
ADJUST SCREW
VALVE
CAP
Figure 4-7. Boom Control Bypass Valve, Basket Station