INSTRUMENTS AND CONTROLS 83
Exhaust Pyrometer Gauge (High Level Cluster Only)
The exhaust pyrometer gauge indicates the exhaust temperature, which helps the operator
get the best efficiency from the engine. Variations in engine load can cause the exhaust
temperature to vary. For example, high exhaust gas temperature is the result of prolonged
engine lugging or over-fueling. If the pyrometer reading shows that exhaust temperature
exceeds normal, reduce fuel to the engine until the exhaust temperature is reduced. Shift
to a lower gear if the engine is overloaded.
Exhaust Pyrometer Gauge (High Level Cluster Only)
The exhaust pyrometer gauge indicates the exhaust temperature, which helps the operator
get the best efficiency from the engine. Variations in engine load can cause the exhaust
temperature to vary. For example, high exhaust gas temperature is the result of prolonged
engine lugging or over-fueling. If the pyrometer reading shows that exhaust temperature
exceeds normal, reduce fuel to the engine until the exhaust temperature is reduced. Shift
to a lower gear if the engine is overloaded.
3. Trailer Air Supply Valve
The trailer air supply valve is a red octagonally-shaped knob. Pull the knob to apply the
trailer emergency brakes. Push the knob to pressurize the trailer air reservoir and release
the trailer emergency brakes. The trailer air supply valve should not be used for parking.
For additional information about the trailer air supply valve, refer to “Parking Brake/Trailer
Supply Valves” page 314.
4. Tractor Parking Brake Valve
The tractor parking brake valve is a yellow diamond-shaped knob. Pull the knob to apply
the tractor parking brakes. Push the knob to release the tractor parking brakes. The tractor
parking brake valve applies the tractor parking brakes and the trailer brakes, if equipped. For
additional information about the tractor parking brake valve, refer to “Parking Brake/Trailer
Supply Valves” page 314.
5. Inter-Wheel Differential Lock
The inter-wheel differential lock eliminates one-wheel spin-out on slippery surfaces and
improves traction. The switch has a safety latch to prevent accidental engagement.
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