Operator`s manual

8.3 LADDER OPERATION - FAST IDLE ADJUSTMENT
The Fast Idle System is air activated. It consists of a Limiting Speed Mechanical Governor located on the
engine governor cover. It is activated by air pressure controlled by the engine air compressor governor.
The higher the air pressure the greater the engine RPM. The pressure is adjusted by a regulator located
near the PTO (see Figure 5-1, number 3).
To set the engine RPM, one operator pushes the throttle control on the left Outrigger Panel and observes
the RPM Gauge, while a second operator adjusts the Regulator until the desired RPM is reached (the
engine should be set at 1200 RPM).
8.4 MAIN HYDRAULIC PRESSURE - RELIEF VALVE ADJUSTMENT
The main hydraulic pressure adjustment is controlled by a Relief/Unloader MUV 3 Way Flow Control Valve
on the turntable (see Figure 8-1). When ladder hydraulics are engaged and the green Throttle Control
Button pulled up, pilot pressure is 450 psi while the ladder is stationary. Pilot pressure is indicated by the
Hydraulic Pressure Gauge on the Ladder Control Console. Adjust pilot pressure before adjusting the main
hydraulic pressure. Start the engine and switch the PTO to "ENGAGED". Deploy the outriggers. Push in
the Ladder/Outrigger Selector Control Valve to select ladder hydraulics. Pull up the green Throttle Control
Button on the Ladder Control Console. The engine rpm is 1200. With assistance, loosen the lock nut and
turn the adjusting screw (see Figure 8-1, number 1) clockwise to increase pressure to 450 psi or turn the
adjusting screw counterclockwise to decrease pressure to 450 psi. Tighten the lock nut.
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