Assembly, SAW Chain Tension Adjustment

CHAIN SAW NAMES AND TERMS

Continued

Replacement Chain Chain that complies with ANSI B175.1 when used with a speciÞc saw. It may not meet ANSI requirements when used with other saws. Saw Chain (Chain) Loop of chain having cutting teeth for cutting wood. The motor drives chain. The guide bar supports chain.

Spiked Bumper (Spike) Pointed teeth at front of saw body beside guide bar. Keep spiked bumper in contact with wood when felling or bucking. It helps maintain position of saw while cutting.

Sprocket Toothed wheel that drives chain. Switch Device that completes or interrupts electri- cal circuit to motor of saw.

Switch Linkage This device connects switch to trig- ger. It moves switch when you squeeze trigger. Switch Lockout Device that reduces accidental start- ing of saw.

Trigger Device that turns saw on and off. Squeezing trigger turns saw on. Releasing trigger turns saw off. Trimming (Pruning) Process of cutting limb(s) from a living tree.

Undercut An upward cut from underside of log or limb. This is done while in normal cutting position and cutting with top of guide bar.

ASSEMBLY

Note: Some models are pre-assembled. Assembly is not needed on these models.

See Saw Chain Tension Adjustment, pages 16 and 17.

WARNING: Cutting edges on chain are sharp. Use protective gloves when handling chain.

IMPORTANT: Do not clamp chain saw in vise during assembly.

1.Lay chain out ßat.

2.Loosen and remove guide bar nuts, sprocket cover bushings, and sprocket cover.

3.Loosen and remove drive sprocket screw or re- move E-ring from shaft (see Figure 4). Remove sprocket support.

4.Install guide bar onto saw body. Assemble cen- ter slot of guide bar onto guide bar bolts.

5.To replace sprocket support, repeat step 3 in re- verse order. Firmly tighten drive sprocket screw with #2 Phillips screwdriver (if applicable).

6.Place chain around drive sprocket, along top groove of guide bar, and around guide bar nose. Note: Make sure cutting edges of chain are fac-

ing in right direction. Position chain so cutting edges on top of guide bar face guide bar nose (see Figure 4, and indicator on side cover of saw).

CAUTION: Do not place chain on saw backwards. If chain is backwards, saw will vibrate badly and will not cut.

7.Insert tab of sprocket cover into slot on side cover and rotate sprocket cover onto guide bar bolts until sprocket cover rests against guide bar.

8.Place sprocket cover bushings and guide bar nuts, removed in step 2, over guide bar bolts. IMPORTANT: Tighten guide bar nuts finger tight only.

9.Turning tensioner knob (Model 107625-01, -02) or tensioner screw (Model 107624-01, -02), adjust position of nib until it is aligned and inserted into the round adjusting hole on guide bar (see Figures 4, 5, and 6). Turning tensioner knob or screw coun- terclockwise will move tensioner bar to rear of guide bar. Turning tensioner knob or screw clockwise will move tensioner bar to front of guide bar.

10.If needed, readjust guide bar nuts to finger tight only.

11.Adjust saw chain tension. Follow steps under Saw Chain Tension Adjustment, pages 16 and 17.

SAW CHAIN TENSION ADJUSTMENT

WARNING: Unplug chain saw from power source before adjusting saw chain tension.

WARNING: Cutting edges on chain are sharp. Use protective gloves when handling chain.

WARNING: Maintain proper chain tension always. A loose chain will in- crease the risk of kickback. A loose chain may jump out of guide bar groove. This may injure operator and damage chain. A loose chain will cause chain, guide bar, and sprocket to wear rapidly.

Note: For pre-assembled models, the saw chain ten- sion is properly set at factory. A new chain will stretch. Check new chain after first few minutes of operation. Allow chain to cool down. Follow steps below to readjust saw chain tension.

1.Before adjusting chain, make sure guide bar nuts are only ﬁnger tight (see Figure 4). Also make sure adjusting nib is in round adjusting hole on guide bar (see Figures 4, 5, and 6).

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