10
EC7500.20A
Assembly
EC7500.19
Figure 6
Instruction
Manual
Engine Unit
Tool Set
Figure 7.
Belt
Guard
Hex
Wrench
Mounting the Cut-off Wheel
1. Select a cut-off wheel for your work
according to the following chart.
Refer to the wheel manufacturer’s
manual for additional information.
Recommended Cut-off Wheels
Inner bore: 0.78" (20mm),
0.86" (22mm), 1.0" (25.4mm)
Wheels for EC7500
Abrasive: 305mm outer diameter
Diamond: 320mm outer diameter
Wheels for EC7600
Abrasive: 355mm outer diameter
Diamond: 360mm outer diameter
Prior to Assembly
Before assembling, make sure you
have all the components required for a
complete unit. This unit consists of the
items shown in Figure 6.
Carefully inspect the engine unit for
damaged or loosen bolts. If you find
any damage or missing items, check
with your dealer.
IMPORTANT!
This unit is
equipped with a
0.86" (22mm)
wheel collar.
Wheel adapters
for 20mm and
25.4mm cut-off
wheels are
located in the
tool set. Before
mounting a
wheel, deter-
mine its arbor
diameter. If it is
necessary to
replace the
collar, remove the snap ring on the
arbor, install the correct size arbor
collar, and then replace the snap ring.
WARNING!
Use of the incorrect collar size
may lead to wheel failure and unit
failure that could result in serious
injury.
2. Make sure the ON-OFF switch is
Off and the engine is stopped.
3. Insert a hex wrench into the hole in
the belt guard to prevent the arbor
from turning. See Figure 7.
EC7500.45
Snap
Ring
Flange
Drive Shaft
Collar
EC7500.49
20mm
Collar
22mm
Collar
25.4mm
Collar
19
EC7500.34
High and Low Speed Needle
The high and low speed needle is
fixed and cannot be adjusted.
Spark Plug Maintenance
If the engine becomes hard to start or
if idle speed is unstable, inspect the
spark plug according to the following
procedures.
1. Remove the spark plug. Refer to
the procedures on page 13,
If the
Engine Does Not Start…
2. Clean the electrode with a wire
brush. If necessary, adjust the
electrode gap. The gap should be
0.024" (0.6mm). See Figure 24.
Cleaning Cylinder Fins
WARNING!
Before cleaning cylinder fins,
make sure the engine is cold.
Dust and debris may accumulate
between the cylinder fins and can lead
to engine overheating. In order to
maintain efficient service, cylinder fins
should be cleaned once every month.
Checking the Drive Belt
The transmission belt tends to loosen
and wear after a period of operation
and should be checked and adjusted
regularly according the following
procedures. If the belt is worn, torn,
cracked, scratched or otherwise
damaged, replace it with a new one
immediately.
Adjusting Belt Tension
(Figure 25)
1. Loosen the two bolts in the belt
guard by one turn.
2. Turn the tension screw so the
washer aligns with the mark on the
clutch cover.
3. Tighten the two bolts in the belt
guard.
Figure 24
0.024"
(0.6mm)
EC7500.34A
Figure 25
Clutch
Cover
Bolt
Mark
Belt Guard
Washer
Tension
Screw
