The maximum fore and aft grade in static condition on which any machine will maintain proper lubrication is 45º angle (100%). Consult Operation & Maintenance Manual for POWER TRAIN fluid level overfill requirements for operation on extreme slopes. Extreme slope operation is anytime the slope exceeds 25° (47%). The ENGINE should never be overfilled with oil. This may lead to rapid overheating. For extreme slope operation, engine oil should be maintained at the full mark. NOTE: Both ENGINE and POWER TRAIN fluid levels should be checked on level ground before working side hills and slopes.