MAIN RELIEF VALVE ADJUSTMENT
Before performing any hydraulic troubleshooting in bowl, move
ejector forward and disable it by disconnecting ejector cylinder
from hydraulic system. Failure to comply may result in severe
injury or death to personnel.
Have suitable container ready to catch oil.
Disable the ejector from the hydraulic system by disconnecting CONT VLV-21 hose (1)
from elbow (2) at port 21 and CONT VLV-22 hose (3) from elbow (4) at port 22 on ejector
control valve. Cap and plug hoses and fittings.
With pressure measuring device (5) and tee (6) still connected to HYDR-FLTR-IN 13L
hose (7) and high-pressure filter inlet port 13L and SPRUNG/UNSPRUNG lever in
SPRUNG, have assistant move left hand SUSPENSION CONTROL lever to RAISE, while
at the same time, holding EJECTOR CONTROL lever in BACK. Read pressure
measuring device (5). If the pressure is not within limits, adjust the main relief valve 13L
by loosening jamnut (8) and rotating adjustment screw (9) clockwise to increase pressure;
counterclockwise to decrease pressure. When hydraulic pressure is within limits, tighten
Stop engine; relieve hydraulic pressure.
Move test equipment to high-pressure filter inlet port 13R and repeat the previous steps
using the right-hand suspension control lever.
Stop engine; relieve hydraulic pressure. Remove all test equipment and connect hoses.