Operator`s manual

MAINTENANCE MANUAL
SECTION 8
8. LADDER CALIBRATION AND ADJUSTMENT
8.1 GENERAL
Section 8 describes how the Ladder Assembly is calibrated and how adjustments are made to the Relief
Valves, Limit Switches and Ladder and Dial Cables. To assist in locating components discussed in the
text, all the electric and relief valves on the truck have been tagged with an identifying number, which
corresponds with their identifying number on the hydraulic schematic (see Figure 5-2).
8.2 ADJUSTMENT OF RELIEF VALVES
To determine if relief valves require adjustment, pressure is applied to the system by operating
components against mechanical stops. Pressure should only be applied long enough to adjust the valves.
Then the valve should be closed. Prolonged application of pressure will cause damage to the assembly.
Although there are adjusting screws (see Figure 8-2, numbers 7, 8 and 9) for the flow control valves,
which are integral to the Proportional Valve, the flow control valves are factory set and do not require
adjustment.
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