58 Series 4180 Powerhead
: Use a screwdriver to push the 
slide (if fitted) to the bottom end 
of the slot (arrow).
To avoid the risk of electrocution, do 
not start the unit while the control 
handle is open.
: Take out the screws (arrows).
– Remove handle molding.
: Remove the torsion spring.
: Remove the trigger (1) with 
attached throttle cable (2) from 
the pivot.
: Disconnect throttle cable from 
the trigger.
: Take the tensioner (1) out of the 
guide and remove the throttle 
cable.
: Lift the lockout lever (1) a little 
and turn it to the side until the 
torsion spring (2) is relieved of 
tension.
– Pull the lockout lever off the pivot.
9. Throttle Control
9.1 Throttle Trigger, Lockout 
Lever