McCulloch MAC 838 - Manual

5 S Mix and pour fuel in an outdoor area on bare ground; store fuel in a cool, dry, well venti- lated place; and use an approved, marked container for all fuel purposes. Wipe up all fuel spills before starting saw. S Move at least 10 feet (3 meters) from fuel- ing site before starting engine. S Turn...

6 Thumb on underside of handlebar Elbow locked S Keep a good, firm grip on the saw with both hands when the engine is running and don’t let go. A firm grip will help you reduce kick- back and maintain control of the saw. Keep the fingers of your left hand encircling and your left thumb under the fro...

7 ASSEMBLY Protective gloves (not provided) should be worn during assembly. ATTACHING THE BUMPER SPIKE The bumper spike may be used as a pivot when making a cut. 1. Loosen and remove the bar nuts and the clutch cover from the saw. 2. Attach the bumper spike with the two screws as illustrated. ATTACH...

8 Clutch Cover Lower Hole Guide Bar Adjusting Pin 12. Install bar nuts and finger tighten only. Once the chain is tensioned, you will need to tighten bar nuts. CHAIN TENSION (Including units with chain already installed) WARNING : Wear protective gloves when handling chain. The chain is sharp and ca...

9 mixed with a good quality 2-cycle air-cooled engine oil designed to be mixed at a ratio of 40:1. A 40:1 ratio is obtained by mixing 0,125 liter of oil with 5 liters of unleaded gasoline. DO NOT USE automotive or boat oil. These oils will cause engine damage. When mixing fuel follow the instruction...

10 DIFFICULT STARTING (or starting a flooded engine) The engine may be flooded with too much fuel if it has not started after 10 pulls. Flooded engines can be cleared of excess fuel by pushing the choke/fast idle lever in completely (to the OFF CHOKE position) and then following the warm engine star...

12 Overcutting begins on the top side of the log with the saw against the log. When overcut- ting use light downward pressure. Overcutting Undercutting Undercutting involves cutting on the under- side of the log with top of saw against the log. When undercutting use light upward pres- sure. Hold saw...

13 S Make your fist cut 1/3 of the way through the bottom of the limb. S Next make a 2nd cut all the way through the limb. Then cut a third overcut leaving a 3 to 5 cm collar from the trunk of the tree. First cut Second cut Third cut Collar Pruning technique SERVICE AND ADJUSTMENTS WARNING : Imprope...

14 Replace guide bar when the groove is worn, the guide bar is bent or cracked, or when excess heating or burring of the rails occurs. If replacement is necessary, use only the guide bar specified for your saw in the repair parts list or on the decal located on the chain saw. SPARK PLUG The spark pl...

15 Wrong Squared Off Corner Too Much Hook Angle WARNING : Maintain the proper hook angle according to the manufacturer’s specifi- cations for the chain you are using. Improper hook angle will increase the chance of kick- back which can result in serious injury. 4. Check and lower depth gauges. Depth...

16 TROUBLE CAUSE REMEDY Engine will not start or will run only a few seconds after starting. 1. Ignition switch off. 2. Engine flooded. 3. Fuel tank empty. 4. Spark plug not firing. 5. Fuel not reaching carburetor. 1. Move ignition switch to ON. 2. See “Difficult Starting” in Operation Section. 3. F...

17 TECHNICAL DATA SHEET Engine Mac 838 Cylinder volume, cm 3 38 Stroke, mm 32 Idle speed, rpm 3000 Recommended max. speed, unloaded, rpm 12000 Power, kW 1,5 Ignition system Manufacturer Walbro Type of ignition system Inductive Spark plug Champion Electrode gap, mm 0,5 Fuel and lubrication system Man...