MAINTENANCE & ADJUSTMENTS
GENERAL MAINTENANCE TIPS
Several simple maintenance tasks which, if performed, can keep a chain saw operating at a high level of ef- ficiency. Routine maintenance also keeps replacement costs down on the parts of the chain saw, which occa- sionally wear out.
If any chain saw disassembly is required, refer to the Service Manual.
SAW BAR RAIL
A quick check can be made to determine if saw bar rail or chain segment wear exists. Figure 6 shows a worn saw bar rail.
Figure 7. Rail Wear
If the saw bar rails are worn, use a flat file and dress each one until it is flat and square with the side of the saw bar (Figure 7).
Also make sure the saw bar is perfectly straight. If bows or bends are present in the saw bar, it must be replaced before dressing any rail.
ROTATING THE SAW BAR
Maximum saw bar life can be achieved by occasionally turning the bar over so the top and bottom bar surfaces wear evenly. Refer to the saw bar disassembly proce- dures in the Service Manual for further details.
CHAIN TENSION ADJUSTMENT
Correct chain tension is very important throughout the life of the chain. Check the chain tension often during use (when the chain saw is stopped and the saw bar and chain have cooled off). The chain should move easily around the saw bar when pulled by hand. To adjust the chain tension:
1.Turn off the water and power supplies.
2.Loosen the two saw bar attachment nuts (Item 62, Parts Illustration).
3.Using the saw bar adjustment screw (Item 65, Parts Illustration), tighten the chain until you are still able to rotate it one full revolution by hand (Figure 8).
Figure 8. Pulling the Chain
4.Using hand and finger protection pull the chain around the saw bar to make sure it properly fits the sprocket and saw bar. The chain should be easily pulled.
5.Fully tighten the two saw bar attachment nuts.
NOTE:
Adjust the chain tension each time the drive link tang hangs fully exposed from the groove at the bot- tom of the saw bar (Figure 9).
Min 1/16”
Figure 9. Exposed Drive Link Tang
14 ► DS11 User Manual
