SERVICE LEVEL MAINTENANCE
TM
46
85809
position and the electronic control box three position
power switch is in the “OFF” position. The wire routes
back to the pin 5 on the gray connector for the CAN
receiver.
● Wire is labeled “Ground” where is plugs into the relay
base is negative (
-
) and provides ground for the
relay. The ground wire route back into the harness,
is joined to other ground wires and attach to the
common ground point on the 1540 EC frame.
● Wire is labeled “Power” where is plugs into the relay
base is positive (
+
) and is the electrical power
IN
to
supply the electromagnet. Electrical power is always
present in the wire when the key is in the “ON” or
“START” position. The wire routes back into the
wiring harness and is connected to the power wire
after the fuse.
● Wire is labeled “Power” where is plugs into the relay
base is positive (
+
) and is the electrical power
OUT
to
the electromagnet if the relay is activated. Electrical
power is only present in the wire when the key is in
the “ON” or “START” position and the control box
switch is in the “OFF” position. The wire routes out to
the Throttle Electromagnet Connector wires.
Throttle Electromagnet Connector Wires
FAST/SLOW automatic throttle switching is controlled
by the Control Box ON/OFF switch. When the switch
is in the OFF position, power is supplied to activate the
relay. The relay sends power to the electromagnet to
hold the throttle back to idle.
● The positive (
+
) on the plug is labeled “Power” and is
the electrical power
IN
to the to the electromagnet.
Electrical power is only present in the wire when the
relay is activated by turning the engine ignition key
in the “ON” or “START” position and the electronic
control box switch is in the “OFF” position. The wire
routes back to the relay. Wire is labeled “Power”
where is plugs into the relay base.
● The negative wire (
-
) on the plug is labeled “Ground”
and provides ground for the electromagnet. The wire
is joined with the other ground wires in the harness
and routes back to the “Ground” wire on the bottom
of the relay base and the common ground point on
the 1540 EC frame.
[A]
[B]
[C]
SV85809-16
FIGURE 32
BRIGGS AND STRATTON
®
ADJUSTING AUTOMATIC THROTTLE CONTROL
(See Figure 32)
The throttle control is operated by an electromagnet.
When the electromagnet is activated, it holds the engine
throttle linkage in the SLOW idle throttle position. The
position of the magnet can be adjusted to change/obtain
the desired engine RPM in the “SLOW” position. The set
RPM should be the lowest RPM that the electromagnet
can hold reliably. The “FAST” position engine RPM
is controlled using the manual throttle on the engine
(maximum engine RPM is factory set at 3600 RPM).
NOTE: The electromagnet should be adjusted when the
engine is warm. The magnet will not hold the throttle
governor springs until engine is warm.
Step 1.
Electronic control box ON/OFF switch should
be in “ON” position for spinners.
Step 2.
Loosen outer nut
[A]
until end of nut is even
with end of bolt.
Step 3.
Start engine and allow to it warm up for five
minutes. Use manual throttle control on engine to
select engine speed for warm up.
Step 4.
Set manual throttle control on engine to FULL
throttle. Electronic control box ON/OFF switch should
be in “OFF” position.
Step 5.
Turn nut
[A]
slowly clockwise while checking
RPM until engine is 2100-2200 RPM. Tighten nut
[B]
while holding bolt against back of slot
[C]
.
Step 6.
Switch control to “Spinner ON”, then switch
back to “OFF” to be sure engine returns to set RPM.
If set slow RPM is correct, tighten nut
[B]
to 140 in.
Lbs. (16 Nm) while holding bolt against back of slot.
If engine RPM is not correct, readjust until RPM is
obtained.
