Husqvarna FS 4800 D Operator's Manual page 57

14 Engine / Blade Shaft / Gearbox
Speed Adjustment
(See Figures 1-6)
WARNING: Serious injury can occur to the
operator or people in the work area if the
rotational speed (n/min) of the DIAMOND
BLADE (2E) exceeds the maximum speed (n/
min) marked on the DIAMOND BLADE (2E).
ENGINE SPEED:
The engine speed on this machine does not need to
be changed from the factory set speed. The maximum
engine RPM should be 3250, no load.
BLADE SHAFT SPEED:
The blade shaft speed on this machine should be checked
before fitting the DIAMOND BLADE (2E) to the machine.
Never install a DIAMOND BLADE (2E) if the blade shaft
rotational speed (n/min) of the machine is greater than
the maximum speed (n/min) marked on the DIAMOND
BLADE (2E)! The BLADE SHAFT PULLEY (3-1N,
3-2N) and BLADE SHAFT FLANGE (2B & 2F) may
need to be changed if the diameter of the Diamond Blade
is changed!
SINGLE SPEED GEARBOX MODEL:
Each saw model, as delivered from the factory, is
designed to operate with a specified range of blade sizes
inside the blade guard installed on the machine. If a blade
size outside the specified range of sizes for your model
must be used, then the saw drive configuration must
be changed.
If changing from a small to a very large DIAMOND BLADE
(2E) on a machine with a single speed gearbox, the Blade
Shaft Pulleys (3-1L), Gearbox Pulleys (3-1N), the BLADE
SHAFT FLANGES (2B & 2F), and the Blade Guard must
be changed.
For example, to change a single speed gearbox model
from a 14" (350mm) drive to a 36" (900mm) drive:
1. Change Engine Gearbox Pulley from 6.00" (152mm)
diameter to 3.50" (88.9mm) diameter.
2. Change Blade Shaft Pulley from 4.12" (114.3mm)
diameter to 5.60" (142.2mm) diameter.
3. Change Blade Flanges from 4.50" (114.3mm) diameter
to 6" (152mm) diameter.
4. Change BLADE GUARD (2H) from 14" (350mm) to
36" (900mm).
5. Engine Speed does not change.
See Blade Size Conversion charts for specific
information.
THREE SPEED GEARBOX MODEL (14-26, 18-30,
20-36):
CAUTION: Never shift the Gearbox (3-2A)
with engine running! Only shift the Gearbox
(3-2A) with engine OFF! Gearbox damage
could occur.
See "GEARBOX SHIFT LEVER (3-2O)" for details about
operating shift lever.
A machine factory equipped with a Three Speed ENGINE
GEARBOX (3-2A), while designed to minimize adjustments
required for blade size changes, will require some
adjustments. The machine is designed to operate with a
specified range of blade sizes inside the factory installed
blade guard. Color coded information on machine, and
information in operation manual, shows allowable blade
sizes for current machine drive configuration. There are
three (3) machine drive configurations: a) 14-26 for 14" to
26" (350 to 650 mm) blades, b) 18-30, for 18" to 30" (450
to 750 mm) blades, c) 20-36, for 20" to 36" (500 to 900
mm) blades. For example, to change the blade size on
a machine drive configuration 18-30 within these range,
18" to 30" (450 to 750 mm), requires only that GEARBOX
SHIFT LEVER (3-2O) be moved into the correct position
(1, 2, or 3). If the required blade size is outside of the
machine drive configuration range [below 18" (450mm) or
above 30" (750 mm) for this example], then the machine
drive configuration must be changed. This may require
shifting the GEARBOX SHIFT LEVER (3-2O), changing
BLADE SHAFT PULLEYS (3-2L), GEARBOX PULLEYS
(3-2N) and BLADE SHAFT FLANGES (2B & 2F).
Example: To change a three-speed gearbox model from a
20" (500mm) drive to a 36" (900mm) drive, first determine
the machine drive configuration (14-26, 18-30, or 20-36).
This should correspond to the BLADE SHAFT FLANGE
(2B & 2F) diameter installed on the saw.
If the machine drive configuration is a 20-36, the FLANGE
(2B & 2F) diameter is should be 6.00" (152mm):
a) Verify proper pulley diameters are installed (See Blade
Size Conversion charts for specific information).
b) Shift the GEARBOX SHIFT LEVER (3-2O) from
3 to 1.
c) Verify that machine drive configuration and blade shaft
speed corresponds with information in operation manual,
and gearbox range decal (542 19 06-00).
If the machine drive configuration is an 18-30, the
FLANGE (2B & 2F) diameter should be 5.00" (127mm):
a) Change the BLADE SHAFT PULLEY from 4.50" (114.3
mm) diameter to 5.20" (132mm).
b) Change the BLADE SHAFT FLANGE from 5.00"
(127mm) diameter to 6.00" (152mm).
c) Shift the GEARBOX SHIFT LEVER (3-2O) from
2 to 1.
d) Verify that machine drive configuration and blade
shaft speed corresponds with 20-36 drive configuration
information in operation manual.
e) Install the 20-36 drive configuration decals (Decals
542 19 06-00, 542 20 65-46, 542 20 65-49 are required).
See the "Decals and Locations" page of this manual for
more information.
If the machine drive configuration is a 14-26, the FLANGE
(2B & 2F) diameter should be 4.50" (114.3mm):
a) Change the BLADE SHAFT PULLEY from 4.12"
(105mm) diameter to 5.20" (132mm).
b) Change the BLADE SHAFT FLANGE from 4.50"
(114.3mm) diameter to 6.00" (152mm).
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