dirty, they should be cleaned with 400 grain or finer polishing cloth with alternator in operation.
Blow away all
dust after cleaning operation. If brushes are worn down close, the holder and/or bearings are rough or loose, the
alternator must be rebuilt.
12. Check the specific gravity of the electrolyte in each cell of the battery every 50-hours. If battery does not maintain
1275 specific gravity at 80°F (for each 100 above 80°, add four to required reading and for each 10° below 80°,
subtract four) check charging system. If charging system is working properly, battery should be replaced. In warm
weather, more frequent checks and addition of water may be required.
13. Lubricate the tachometer drive every 100-hours with an all-purpose grease.
14. Lubricate throttle control and all other linkages with multi-purpose grease or engine oil as required every 200-
15. New drive belts will stretch after the first few hours of operation. Therefore, retighten new fan and alternator belts
after one hour and again after eight hours of operation. Thereafter check the tension of the drive belts every 300-
hours and adjust if necessary. Too tight a belt is destructive to the bearings of the driven part; a loose belt will slip
and wear rapidly.
Replace all belts in a set when one is worn. With multiple belts, make certain that they are matched.
Adjust belt tension so that a firm push with thumb at a point midway between two pulleys will depress the belt 1/2-inch to
3/4-inch. If a belt tension gage is available adjust belt(s) in accordance with schedule and chart in engine manufacturer's
16. Lubricate fan shaft bearings with all purpose grease every 1,000-hours on units equipped with grease fittings. On
those units equipped with pipe plugs, remove one plug and loosen