Stihl TS 420 User Manual

10 TS 410, TS 420
4.2 Cast arm with guard
Problem Cause Remedy
Cutting wheel does not run
smoothly or vibrates
Axial or radial runout Set axial or radial true running,
replace cutting wheel if necessary
Ribbed poly V-belt is loose Check and tension ribbed poly
V-belt, replace ribbed poly V-belt or
tensioner if necessary
Grooved ball bearing of the front
poly V-belt pulley is worn
Replace grooved ball bearing
Cutting wheel stops under load
at full throttle
Clutch shoes badly worn Install new clutch
Clutch drum badly worn Install new clutch drum
Ribbed poly V-belt not properly
tensioned
Tension ribbed poly V-belt, replace
if necessary
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
Cutting wheel runs dry although
shutoff cock is open
Shut-off cock or connector for hose
is clogged
Check and clean shut-off cock /
connector, replace if necessary
Nozzles are clogged Clean nozzles, replace if necessary

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