e.Before adjusting belt tension, check the tension several times. Use an average of the readings.f.Belt tension checks must be made at midpoint between pulleys at the longest belt span. Refer to Belt TensionChart (Table 3-2).NOTEIn multi-belt drives, the belt tension readings taken on the same span may vary considerably between belts.When this occurs, average readings to establish applied tension, except in the application of the powersteering pump, where the values stated are for each belt.Table 3-2. Belt Tension ChartTension Condition Belt TensionNew Belt Installation95-100 lb (423-444 N)Steering Pump80 lb (356N)Re-tensionNew truck upon deliveryAfter 10 hours (or 300 miles)After 50 hours (or 1,500 miles) 80-85 lb (356-378 N)After intervals of 200 hours(or 600 miles)Steering Pump50 lb (222N)Minimum Permissible Tension60 lb (267N)Steering Pump50 lb (222N)3-10 FRAME AND TOW HOOKS3-10.1Because Navistar chassis are manufactured with frame rails of either mild carbon steel, HSLA steel, heat-treatedsteel or aluminum alloy, each must be handle in a specific manner to assure maximum service life. Before attemptingframe repair or modification, consult the service manual.3-10.2Front and rear tow hooks should be inspected for damage or a loose mounting.This is of great importance, particularly on vehicles where the tow hooks are used frequently.3-11 FUEL AND LUBRICANT ADDITIVES3-11.1Refer to Fuel and Lubricant Additives segment in Chapter 4 of this manual.3-12 FUEL SYSTEM3-12.1Frequently check throttle linkage for proper operation.3-10
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