Stihl TS 420 User Manual

9TS 410, TS 420
4. Troubleshooting
4.1 Clutch
Problem Cause Remedy
Cutting wheel stops under load
at full throttle
Clutch shoes badly worn Install new clutch
Clutch drum badly worn Install new clutch drum
Cutting wheel rotates at idle speed Idle speed too high Readjust with idle speed screw LA
(counterclockwise)
Clutch springs stretched or fatigued Replace tension springs, replace
clutch if necessary
Clutch spring hooks broken Replace tension springs
Loud noises Clutch springs stretched or fatigued Replace all tension springs
Grooved ball bearing on poly V-belt
pulley / clutch drum damaged
Replace grooved ball bearing
Clutch shoe retainer broken Replace retainer
Clutch shoes and carrier worn Install new clutch

Stihl TS 420 Specifications

General

Engine Power	4.4 bhp
Weight	21.2 lbs
Arbor Size	20 mm
Maximum Wheel Size	350 mm
Maximum Cutting Depth	125 mm
Displacement	66.7 cc (4.1 cu. in.)
Fuel Capacity	710 cc