Poulan 1990-10 User Manual - Page 16

A WARNING The Depth Gauge Tool is reqquuiIrreedto insure proper depth gauge. Filing the depth gauge too deep will increase the chance of kickback which can result in serious injury. b. CHAIN REPLACEMENT 1.) Use only the replacement chain specified for your saw (see "NOTE" in the Accessory section). 2.) Replace the chain when cutters or links break. 3.) See a qualified service dealer to replace and sharpen individual cutters for matching your chain. 4.) Always have a worn sprocket replaced by a qualified service dealer when installinga new chain to avoid excessive wear to the chain. 2. GUIDE BAR MAINTENANCE • Conditions which can require guide bar maintenance: - saw cuts to one side. - saw has to be forced through a cut. - inadequate supply of oil to bar and chain. • Check the condition of the guide bar each time the chain is sharpened. A worn guide bar will damage the chain and make cutting more difficult. • Replace the guide bar when: - the groove in the guide bar is worn. - the guide bar is bent or cracked. • Use only the replacement guide bars specified for your saw. Reduced Kickback guide bars are available (see "NOTE" in the Accessory section). a. Remove the guide bar to service. Hook An 0 .025,, Too Much Squared Hook Angle -"•-•, Off Corner \*. Rounded Corner • Right Way Figure 33 Wrong Way Remove Sawdust From Guide Bar Groove • 0 Figure 34 Ws -lia I tr Correct Guide Bar Worn Grooves Groove File Edges Square Figure 35 b. Clean the oil holes at least once after every five hours of operation. c. Remove sawdust from the guide bar groove periodicallywith a putty knife orawire. Figure 34 . d. Remove burrs by filing the side edges of the guide bar grooves square with a flat file. Figure 35 . e. Square the edges of an uneven rail top by filing with a flat file. Figure 35 . B. SPARK ARRESTOR • Carbon deposits build up on the spark arrestoras thesawis usedand mustbe removed to avoid creating a fire hazard or causing engine damage. • Replace the spark arrestor if breaks occur. • Keep the spark arrestor clean at all times. Clean: -as required. -at least once for each 25-30 hours of operation. Items required: wire brush, 3/8" wrench 1. Disconnect the spark plug wire. 2. Remove the Muffler Covet Figure 36 . 3. Remove the Screen from the muffler. 4. Clean the screen with a wire brush or replace if breaks are found. 5. Reassemble parts. NOTE: Too much oil in the fuel mixture can cause excessive carbon build-up in the spark arrestor screen. Use only the correct fuel/oil ratio as instructed in the Engine Information section. Muffler Cover gg 0 Spark Arrestor Screen Figure 36 READ SPECIAL SAFETY SECTION FREQUENTLY - 16 -