INSTRUMENTS AND CONTROLS 67 40. Primary and 41. Secondary Air Pressure Gauge — Indicates the air pressure in the air brake system(s). The normal operating air pressure is between 759 kPa (110 psi) and 897 kPa (130 psi) in both air brake systems. If pressure drops below 75 psi (± 5 psi) in either system, the warning buzzer and warning light will go on. Determine the cause of failure before proceeding. Primary air pressure is supplied to the rear brakes and is indicated by the green pointer on the gauge. Secondary air pressure is supplied to the steering axle brakes and indicated by the orange pointer. 42. Wiper Speed/Delay/Wash Master Switch • Depress top of the rocker switch to activate windshield washer • Toggle switch in top position turns wipers on HIGH • Toggle switch in second position from top turns wipers on LOW • Toggle switch in the center position activates intermittent wipers. Pressing the switch down slows the speed of the wipers • Toggle switch in the lowest position turns wipers OFF
C0029147
Wiper Speed/Delay/Wash Master Switch 1. Press to Wash
4. Intermittent
2. Hi
5. Off
3. Lo
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