Husqvarna BT 90 EI, Operator'S Manual, Page: 10 / 20

in the winch cables are kept and it is easier to control
the movement of the product.
If the product has a fuel drive unit, it is necessary to lift
and turn the product around to change the direction of
rotation.
If the product has an electric drive unit, refer to
To set
the direction of rotation for the BT 90 EI drive unit on
page 10 .
To set the direction of rotation for the BT 90 EI
drive unit
The direction of rotation is set with the phase selector in
the electrical connection on the product.
1. Put a screwdriver in the slot.
2. Push in the screwdriver and turn the screwdriver a ½
turn.
To adjust the angle between the truss
screed sections
CAUTION Do not increase the angle to more
than ±3% as this decreases the life of the
shaft coupling.
1. Assemble the truss screed sections. Refer to
Assembly on page 7
.
2. Loosen the 4 nuts for the screws (A) at the joint
between the truss screed sections.
B
C
A
3. Make sure that the thread of the screws are clean
and there is no concrete.
4. Turn the stretching screw (B) to adjust the angle.
5. Tighten the nuts for the screws (A).
6. Tighten the locknut (C) to lock the stretching screw.
To start the product
To start the electric drive unit (BT 90 EI)
1. Make sure that the frequency and voltage shown on
the rating plate is the same as the power supply
voltage.
2. Connect the power plug of the drive unit to the power
supply.
3. Start the drive unit.
4. Examine the direction of rotation of the vibration
shaft. If the direction is incorrect, change to the
opposite direction. Refer to To set the direction of
rotation for the BT 90 EI drive unit on page 10
.
To start the fuel drive unit (BT 90 GI)
1. Fill engine oil. Refer to the engine manual.
2. Fill fuel.
3. Open the fuel valve.
4. Set the choke control in the correct position.
a) If the engine is cold, close the choke.
b) If the engine is warm or the ambient temperature
is high, open the choke.
5. Set the engine ON/OFF switch to ON.
6. Start the engine.
7. Let the engine operate at idle speed for 2–3 minutes
and then increase to full speed.
CAUTION Do not operate the engine at too
high speed. Refer to
Technical data on page
15 for maximum engine speed.
To operate the product
WARNING Do not touch the shaft during
operation of the product. The shaft rotates
and can cause serious injury.
2 operators are necessary to operate the product safely
and correctly. 2 more operators are necessary to make
sure that the result is satisfactory.
• Let 1 operator walk on the drive unit side of the
product. This operator operates the start and stop
functions and the winch on that side.
• Let 1 operator walk on the opposite side and operate
the winch on that side.
• Let 2 operators walk in front of the product and
remove unwanted concrete with a flat concrete
spreader. Concrete collects in front of the product. If
the unwanted concrete becomes higher than 2-3 cm,
the concrete surface does not become flat.
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