F-550
2.5.5.1.1 Adjusting the wheel drive tension pulley
If you are not sufficiently technically competent, assign this task to a professional service centre.
Remove the rear upper plastic
gearbox cover
1
(on
Pic. 7
), to enable you to see both V-belts that drive the machine forward. Try
again to overcome the surface irregularity and visually check which, belt is slipping.
(Designation
A
,
B
and
C
on
Pic.11
is common and always refers to the same cable).
1)
If the V-belt on the right side of the machine is slipping
(
Pic.9
Pic.10
), tighten it by loosening the screw (
C
on
Pic.13
in the direction of the arrow (away from the frame) by approximately 1 mm. Continue tightening until
the machine overcomes surface irregularities, while remaining at rest when the wheel drive clutch lever is released. If the screw
C
cannot be unscrewed further, screw it fully in the opposite direction to the arrow and hook the spring on the end of the cable
to the hole further away in the pulley arm. Subsequently repeat the steps for tightening the belt.
2)
If the belt is slipping between the engine and the gearbox
, tighten it using the tension pulley (
1
on
Pic.15
). Release the
tensioner by loosening the nut on the engine plate and tighten the pulley with a suitable tool (e.g. screwdriver) in the direction of
the arrow, and tighten the nut while under tension. Subsequently check the correction operation of the wheel drive.
The belt must be replaced when you can no longer adjust the belt tensioner to prevent belt slippage.
2.5.5.1.2 Adjustment of the work tool drive tension pulley
Take off the front
plastic cover
9
on
Pic.3
so that you can see the belt and blade drive pulley (
Pic.11
). (Designation
A
,
B
and
C
on
Pic.11
is common and always refers to the same cable).
1)
Tighten the V-belt by loosening
A
on
Pic.12
by roughly 1 mm in the direction of the arrow and inspect the
clutch operation of the tool drive clutch. Continue tightening until the belt drive begins to turn the work tool when depressing the
clutch lever approx. 1/3, while ensuring meanwhile that the belt drive does not drift when the work tool clutch lever is released. If
the screw
A
cannot be unscrewed further, screw it fully in the opposite direction to the arrow and hook the spring on the end of
the cable to the hole further away in the pulley arm. Subsequently repeat the steps for tightening the belt.
Inspect the operation of the automatic brake after every adjustment.
2.5.5.2 Replacing the V-belt
Always replace the V-belt
with a new one whenever the belt shows signs of cracking or tearing and whenever the belt is so worn that it
can no longer be tightened using tensioners. The exact procedure for changing the belt is not included here because it would exceed the
scope of this manual. When replacing, follow the instructions given in
Pic.9
Ensure that the belt path around all leading
components is followed!
If you are not sufficiently technically competent, assign this task to a professional service centre.
2.5.5.3 Checking brake operation and adjusting the brake
Check the operation of the automatic brake after every 10 hours of use. You can perform regular checks when working.
Whenever the
tool drive clutch lever is released, the automatic brake must stop the rotating work tool within 5 seconds.
Do not continue working unless you repair the defect on the automatic brake!
If you are not sufficiently technically competent, assign this task to a professional service centre.
If the brake does not stop the rotating tool within the specified time, the brake cable
B
on
Pic.11
adjustment screw is attached on the brake cable (
B
on
Pic.12
) to the frame, should be turned in the opposite direction of the arrow
(towards the frame) so that the axial clearance of the cable in the adjustment screw is 1 mm. Check the operation of the automatic brake.
If the screw
B
when fully tightened does not achieve sufficient braking, screw in the brake cable adjustment screw (
B
on
Pic.14
) on the
handlebars so the cable axial clearance in the adjustment screw is 1 mm and subsequently recheck the operation of the automatic brake
If the brake fails to brake sufficiently even after adjustment, contact a professional service centre. Do not
continue operating the machine without a functional brake under any circumstances!
2.5.6 Servicing intervals
62
You may also use screw (
C
on
Pic.14
) on the opposite end of the Bowden cable attached to the handlebar traverse. In such an event, screw it from the handlebar traverse in the
direction of the arrow.
63
You can also use the screw on the opposite end of the Bowden cable attached to the handlebar traverse. In such an event, screw it away from the handlebar traverse.
64
Use exclusively genuine replacement parts. Proper gear function cannot be guaranteed when using V-belts from different manufacturers.
65
May be performed in the opposite way – first screw in (towards the handlebar traverse) Brake bowden cable screw on the handles so the axial clearance is 1 mm in the adjustment
screw.
28
05
/2
01
2
