100 CHAPTER 3
Maintenance
Dump Valve Pressure
Adjustment Procedure
The dump valve is provided with a
safety relief cartridge. This cartridge
requires to be adjusted 10% higher
than the system pressure, therefore
3300 PSI. It also requires to be
adjusted before the main relief valve.
Note:Two persons are required to
adjust the dump valve.
1. Make sure the parking brake is
applied and the vehicle is tagged
out for maintenance purposes
(refer to “Lockout/Tagout
Procedure” on page 8);
2. Hook a 0-4000 PSI pressure
gauge on the quick connect
located on the hydraulic valve
(Figure 158. “Dump valve” and
Figure 159. “Quick-connect
dump-valve pressure gauge”);
Figure 158. Dump valve
Figure 159. Quick-connect
dump-valve pressure gauge
3. Start the engine, engage the
hydraulic system;
WARNING
APPLY THE LOCKOUT / TAGOUT
PROCEDURE
AT ALL TIMES WHEN
MAINTENANCE
OR INSPECTION IS
CARRIED
OUT ON THE VEHICLE.
0-4000 PSI
Gauge
HYJ00910
HYF10195
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