MAIN RELIEF VALVE TEST
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.
When moving test equipment to high-pressure filter inlet port
13L, the coupling tube and globe valve installed during the main
hydraulic pump test will not be required.
Have suitable container ready to catch oil.
Start engine, move ejector forward, stop engine, and relieve hydraulic pressure.
Disable ejector by disconnecting CONT VLV-21 at port 22 on ejector control valve. Plug
hoses; cap elbows.
Start engine; have assistant hold EJECTOR CONTROL lever in BACK position. Read
pressure measuring device (5). Check main relief valves 13R and 13L individually as
With SPRUNG/UNSPRUNG lever in SPRUNG position, have assistant move right-hand
SUSPENSION CONTROL lever to RAISE while, at the same time, holding the
EJECTOR CONTROL lever in BACK. Read pressure measuring device (5). If the
pressure is not within limits adjust the main relief valve 13R.
MAIN RELIEF VALVE ADJUSTMENT
Loosen jamnut (6) on main relief valve 13R.
Have assistant simultaneously hold EJECTOR CONTROL lever in BACK while holding
the right-hand SUSPENSION CONTROL lever in RAISE.
Rotate adjusting screw (7) on main relief valve 13R clockwise to increase pressure and
counterclockwise to decrease pressure. Once hydraulic pressure is within limits, tighten
Stop engine; relieve hydraulic pressure.
Move test equipment to high-pressure filter inlet port 13L and repeat the previous steps
using the left-hand SUSPENSION CONTROL lever.