16
English / USA
SR 340, SR 420
Adjusting the control handle
: Put the machine on your back.
: Loosen the clamp screw (1). 
: Slide the control handle (2) along 
the tube to the most comfortable 
position.
: Tighten down the clamp screw (1) 
firmly.
Adjusting the Harness
: Pull the ends of the straps 
downward to tighten the harness.
Loosening the Harness
: Lift the tabs of the sliding adjusters.
: Adjust the straps so that the 
backplate is held firmly and 
comfortably against your back.
Throwing Off Backpack
Before using the machine, make 
yourself familiar with how to release and 
throw off the backpack.
In an emergency, quickly throw the 
machine off your back as follows:
: Open the quick-release fastener on 
the waist belt (special accessory).
: Open the strap hook on the 
backplate by snapping it forwards 
(arrow).
: Throw the machine to the rear.
1
2
372BA029 KN
Harness
373BA003 KN
373BA004 KN