104 CHAPTER 3
Maintenance
Retract:Work port relief at 1500 PSI at
idle speed (to prevent shocks when
packer changes direction)
Hoist
Down:To tank
Up:Work port relief at 1700 PSI at idle
speed
Note:The work port relief cartridges
are fixed and do not need
adjustment. If pressures differ
from those above by + or
– 100 PSI, remove and clean
the cartridges or replace them
as needed.
Figure 164. Main hydraulic valve
To adjust the main relief valve
pressure, apply the following
procedure:
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. Start the engine;
3. Engage the hydraulic system;
4. Using the selector switch on the
console, select the right-hand
side packer control station
(Figure 165. “Packer Control
Selector”). This switch exists
only on vehicles equipped with
multiple packer control stations;
Work Port
Relief
DANGER
APPLY THE LOCKOUT / TAGOUT
PROCEDURE
AT ALL TIMES WHEN
MAINTENANCE
OR INSPECTION IS
CARRIED
OUT ON THE VEHICLE.
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