Husqvarna ProFlex 18 ProFlex, 20 ProFlex Operator's Manual page 32

9. Loosen the height setting arm by moving the
rear section upwards. When dismantling the
cutting unit, off-load the arm by pulling the
frame's front section upwards.
10. Pull the handle and unit simultaneously. Release
the handle when the unit has come out a little.
11. Pull out the unit so that it engages in the outer
hooks.
12. Lower the unit using the lever on the right-hand
side of the driver.
13. Pull the handle so that the hook guard locks.
Check that the catch (A) is in its loaded position.
14. Lift the unit off of the Rider.
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– English
MAINTENANCE
A