O-Mac MF 2500 Manual page 53

1. Loosen all the nuts (Fig. 3.A) and remove
the clutch cover (Fig. 3.B) to get to the drive
sprocket and the point where the bar is fitted.
2. Remove the plastic spacer (Fig. 3.C);
this spacer must be used exclusively when
transporting the machine in its packaging and
must not be used at any other time.
3. Mount the bar (Fig. 4.A) by inserting the
stud bolts (Fig. 4.B) in the groove (Fig. 4.C)
and push it towards the back of the machine
body.
4. Mount the chain (Fig. 5.A) around the drive
sprocket (Fig. 5.B) and along the bar guide
(Fig. 5.C), making sure it is fitted in the right
direction (Fig. 5.D).
If the tip of the bar is equipped with a nose
sprocket, make sure the drive links are
correctly inserted in the sprocket rims (Fig. 6).
5. Check that chain tension adjuster pin (Fig.
7.A) is fitted properly into the hole on the bar;
if it isn't, turn the chain tension adjuster screw
using a screwdriver (Fig. 7.B), until the pin is
completely inserted.
6. Refit the guard without fully tightening the
nuts.
7. Turn the chain tension adjuster screw (Fig.
8.A) to achieve the desired tension.
8. Raise the bar and tighten the guard nuts
securely using the wrench (Fig. 9).
4.2.1 Checking the chain tension
Check the chain tension.
The tension is correct when the drive links do
not slip out of the chain guides if you hold the
chain in the middle of the bar (Fig. 10).
Direction in which the
chain runs
V. Controls
5.1 Engine start/stop switch
Used to start and stop the engine (Fig. 11.C).
The engine can start and run.
The engine stops.
After pressing the stop switch, the switch
automatically returns to the start position "I"
5.2 choke lever
Used to turn on the engine when cold.
The choke control has two positions:
Position a (fig. 11.A) - the choke is
not engaged (normal operations
and warm start)..
Position b (fig. 11.B) - the choke is
engaged (for a cold start). .
5.3 Primer control button
Press the rubber button of the
primer (fig. 12.A) to inject fuel into
the carburettor intake manifold to
facilitate startup when the engine
is cold.
5.4 Pressure relief valve control (for model
sp 526 only)
Press the valve (Fig. 13.E) to reduce the
compression of the cylinder and to start the
machine more easily.
53