Stihl 009 Instruction Manual - Page 37

Checking chain lubrication The nose and underside of the guide bar are subject to a particularly high rate of wear. To avoid one-sided wear, turn the bar over every time you resharpen or preplace the chain. Regular cleaning of the oil inlet holes and guide bar groove is also important. The bar can be examined for signs of wear at the same time. A minimum bar groove depth must be maintained in order to prevent the drive links contacting the bottom of the groove (the heels of the cutter and tie strap would no longer on the guide bar rails). The groove depth varies according to chain type and pitch: Chain type Chain pitch Minumum depth Picco 3/8 " 5 mm (0.2") The groove depth should be measured at the point where the bar is stressed most. That is the bar nose on Duromatic bars and the area where most of the cutting is done in Rollomatic bars. The guide bar must be replaced when groove depth is less than the specified minimum. On Rollomatic guide bars it is not necessary to separately lubricate the sprocket nose bearing because the chain oil which flows to the bearing by way of the bar groove during normal operation is adequate for lubrication. Every new chain has to be broken in for about 2 to 3 minutes. Ample chain lubrication is essential during this period. After breaking in, stop the engine, check chain tension and adjust if necessary. Never operate the chain saw without proper chain lubrication. If the chain is allowed to run dry the whole cutting attachment will be irretrievably damaged within a very short time. For this reason you should always check operation of the chain lubrication system and the level in the oil tank before starting work. Start the saw and hold the cutting attachment over a light patch of ground. Take care - the Oilomatic chain must not touch the ground; hold it at least 20 cm (8 in) clear of the ground. Run the engine at about half throttle. If an increasing film of oil can be seen on the ground, chain lubrication is operating correctly. If this is not the case, refer to "Troubleshooting on Chain Oiling System". 125BA022 LA