RedMax GZ7000 - Manual (Page 30)

MAINTENANCE
30 – English
General
The user must only carry out the maintenance and
service work described in this manual.
Carburetor adjustment
Every unit is run at the factory and the carburetor is set in
compliance with emission regulations. Therefore the
chain saw is equipped with movement limiters on the
carburetor adjustment screws, that limit the adjustment
possibilities to a maximum of a 1/2 turn.
Your RedMax product has been designed and
manufactured to specifications that reduce harmful
emissions.
Function
• The carburetor governs the engine’s speed via the
throttle control. Air and fuel are mixed in the
carburetor. The air/fuel mixture is adjustable. Correct
adjustment is essential to get the best performance
from the machine.
• The satisfactory operation of a catalytic converter
depends, among other factors, on the correct
adjustment of the carburetor. Carefully follow the
instructions below, using a tachometer as an aid.
• The setting of the carburetor means that the engine is
adapted to local conditions, for example, the climate,
altitude, fuel and the type of 2-stroke oil.
• The carburetor has three adjustment controls:
- L = Low speed jet
- H = High speed jet
- T = Idle adjustment screw
• The L and H-jets are used to adjust the supply of fuel
to match the rate that air is admitted, which is
controlled with the throttle. If they are screwed
clockwise the air/fuel ratio becomes leaner (less fuel)
and if they are turned anti-clockwise the ratio
becomes richer (more fuel).
• The T-screw regulates the throttle setting at idle
speed. If the T-screw is turned clockwise this gives a
higher idle speed; turning it anti-clockwise gives a
lower idle speed.
Basic settings and running in
The basic carburetor settings are adjusted during testing
at the factory. Avoid running at a too high speed for
extended periods during the first 10 hours.
CAUTION! If the chain rotates while idling the T-screw
must be turned anti-clockwise until the chain stops.
Rec. idle speed: 2700 rpm
Fine adjustment
When the machine has been ”run-in” the carburetor
should be finely adjusted. The fine adjustment should
be carried out by a qualified person. First adjust the L-
jet, then the idling screw T and then the H-jet.
Conditions
• Before any adjustments are made, make sure the air
filter and spark arrestor screen are clean (if not,
replace them) and the cylinder cover fitted. Adjusting
the carburettor while a dirty air filter is in use will result
in a leaner mixture next time the filter is cleaned. This
can give rise to serious engine damage.
• Do not attempt to adjust the L and H jets beyond
either stop as this could cause damage.
• Make sure the bar and chain are properly adjusted.
• Now start the machine according to the starting
instructions and let it warm up for 10 minutes.
• Place the machine on a flat surface so that the bar
points away from you and so that the bar and chain do
not come into contact with the surface or other
objects.
Low speed jet L
Before any adjustments are made, make sure the air filter
and spark arrestor screen are clean (if not, replace them)
and the cylinder cover fitted. Adjusting the carburettor
while a dirty air filter is in use will result in a leaner mixture
next time the filter is cleaned. This can give rise to serious
engine damage.
Adjusting the idle speed
• Start engine, turn idle speed adjustment screw
clockwise until the chain starts to rotate, then turn
screw out counterclockwise until the the chain stops.
Turn screw out counterclockwise an additional 1/4
turn.
IMPORTANT! Any maintenance other than that
described in this manual must be carried out by your
servicing dealer (retailer).
1/2
1/2
H
L
L H
T
!
WARNING! Contact your servicing
dealer, if the idle speed setting cannot be
adjusted so that the chain stops at idle.
Do not use the chain saw until it has
been properly adjusted or repaired.