TM 9-2320-361-10 3-6. GENERAL LUBRICATING INSTRUCTIONS UNDER UNUSUAL CONDITIONS a. Service Intervals. Increase frequency of lubricating servce intervals when operating under unusual conditions such as high or low temperatures, prolonged high-speed driving, deep mud, and extended cross-county operations. Such operations can destroy a lubricant’s protective qualities. More frequent lubricating service intervals are necessary to maintain vehicle readiness when operating in unusual conditions. During inactive periods, with adequate preservation, service intervals can be extended. b. Changing Lubricant Grade. Lubricant grade used varies with weather conditions. Refer to table 1-12 for lubricant grade changes for the following temperature ranges: (1) +l5°F (-10°C) and above (2) +40°F to -15°F (+5°C to -25°C) (3) +40°F to -65°F (+5°C to -55°C) (4) Arctic conditions: Refer to FM 9-207 c. Maintaining Lubricant Levels. Lubricant levels must be checked as specified in LO 9-2320-209-12-1. Steps must be taken to replenish and maintain operating levels. 3-7. LUBRICATION FOR CONTINUED OPERATION BELOW 0•F (-17°C) Refer to FM 9-207, Operation and Maintenance of Ordnance Materiel in Cold Weather (0°F to -65°F). Section III. TROUBLESHOOTING 3-8. GENERAL a. Scope. The troubleshooting table contains instructions that will help the operator identify and correct simple vehicle malfunctions during operations. The table also helps the operator identify major mechanical difficulties that must be referred to maintenance personnel. Major vehicle systems covered in this section include: Ž Ž Ž Ž Ž Ž Ž Engine Transmission Transfer case Front and rear axles Air-hydraulic brake system Wheels and tires Steering 3-2 Change 2