DRIVE LINK WEAR
TANGS WORN STRAIGHT OR CONCAVE
SCARS ON SIDES
Cause : Straight bottoms are due to shallow guide bar body groove. Concave bottoms are due to shallow guide bar nose groove. Solution : Regroove bar. Bar may need replacing Replace saw chain if too worn. Note : Applies to DuraCut™ bars only. Tendency to throw saw chain from bar. Drive links can’t clean guide bar groove.
Cause : Loose chain jumping off bar Solution : Adjust chain tension. Replace bent drive links or replace chain. Refile at correct angle
NICKED BOTTOM OR BACK
FRONT POINT TURNED UP
Cause : Cutting with loose chain, or wrong pitch sprocket Solution : Adjust chain tension. Install correct sprocket. File off burrs. Replace damaged drive links or replace chain
Cause : Drive links bottoming in sprocket. Sprocket worn Solution : Replace sprocket. Sharpen tangs. Check for burrs
FRONT OR BACK PEENED
BATTERED AND BROKEN BOTTOM CHAIN JUMPED BAR
CAN RESULT IN CHAIN STRETCH AND TIGHT JOINTS.
Cause : Chain jumped bar. Spur sprocket hit drive links. Worn or broken drive sprocket and/or loose chain tension results in damage from revolving drive sprocket. Solution : Replace damaged drive links, sharpen tangs with round file or replace chain. Remove burrs. Maintain proper tension to prevent chain from climbing out
Cause : Wrong pitch sprocket or worn out drive sprocket or prolonged chain chatter Solution : Replace sprocket. Adjust chain tension. Chain may be damaged beyond repair
of spur drive sprocket. Replace drive sprocket.
SIDES WORN ROUND AT BOTTOM SAW CHAIN CUTS CROOKEDLY
EXCESS WEAR ON BOTTOM OF ALL CHAIN PARTS
Cause : Chain wobbled in bar groove. Uneven cutters or worn bar rails Solution : Rework bar rails and groove. Correct chain filing
A
B
D
E
C
A. Open bar groove B. Severe abrasion and wobbly chain on thin bar rails C. Rails not flat D. Wobbly chain – rails too thick E. One rail too thin or soft Cause : Uneven filing, worn bar rails cause chain to wobble Solution : File chain properly. Recondition bar rails or replace bar. Replace chain if necessary
Technical Informations
75
Made with FlippingBook Ebook Creator