OM3006.2 04/98 Operation - Section 3 Operator Cab and Controls Page 3-15 HEATER/AIR CONDITIONER VENTS RETARDING CAPACITY CHART The heater/air conditioner vents (7, Figure 3-3) may be rotated 360°. There are three in the Heater/Air Conditioner Compartment (shown be- low), four vents across the top of the panel, and one each in the R.H. & L.H. instrument panel pods. Air flow through the vents is controlled by manu- ally opening/closing or turning the louvers. The Retarding Capacity chart (8, Figure 3-1 & shown below) provides the recommended MAXIMUM truck speeds for descending various grades with a fully loaded truck.
RETARDING CAPACITY CHART The operator should reference the Retarding Capacity chart before descending any grade with a loaded truck. Proper selection of road grade, truck speed, transmis- sion gear range, and use of the retarder lever and/or brake pedal are required to maintain a safe speed. Refer to OPERATING INSTRUCTIONS, ‘‘Retarder Op- eration’’, previously discussed in this Section. DO NOT exceed these recommended MAXIMUM speeds when descending grades with a loaded truck. Customer specified options may cause this decal to change: ALWAYS refer to the Retarding Capacity chart in the operator’s cab , and follow the recommen- dations there for safe truck operation.