Pto Switch (Manual Pto); Brake Switch (Manual Pto) - Craftsman 28906 Professional Shop Manual

CRAFTSMAN
PTO switch (manual PTO)
• The manual PTO switch is mounted on the right
side of the seat box section of the frame.
See Figure 7.11.
Figure 7.11
Brake switch (manual PTO)
• The brake switch is mounted on the top side of
the frame, on the left side behind the dash.
The brake switch used on manual PTO tractors
is a triple pole single throw switch. It has one set
of contacts that are normally closed (NC) and
the other two sets are normally open (NO).
See Figure 7.12.
The PTO switch plunger is depressed when the
PTO lever is moved to the "off" position.
The switch has two pair of contacts: one NO and
one NC.
The Oranqe wire with black trace connects to
one of the NO terminals of the PTO switch.
When the PTO is turned "off' the NO contacts
close, completing a circuit from the brake switch
to the starter solenoid through the oranqe wire
with white trace.
There are three yellow wires connected to the
NC terminals.
,
The yellow wire from the seat switch and
the yellow wire from the RMC module are
connected to the same terminal.
,
The other yellow wire goes to the ignition
module.
,
If the seat is empty or an unsafe condition
is sensed by the RMC module, a ground
signal is sent to the PTO switch. If the PTO
is "on" the ground signal will pass through
the switch and go to the ignition module
turning the engine off.
A- NC
PoleB- NO PoleC- NO
Figure 7.12
The plunger on the switch is depressed when
the clutch / brake pedal is pressed-down, de-
clutching the drive belt and applying the brakes.
The switch contains two sets of contacts.
The normally closed (NC) set of contacts is in
the safety shut-down circuit. If the seat is vacant
the seat switch contacts will close connecting
the yellow wire with white trace to ground. When
the brake pedal is up, the contacts close con-
necting the ground signal in the yellow wire with
white trace to the module through the yellow
wire.
A normally open (NO) set of contacts is in the
starter inhibit circuit. When the clutch / brake
pedal is depressed, the contacts are closed,
power coming from the key switch (key switch in
START) through the oranqe wire is passed on to
the PTO switch through the oranqe wire with
black trace.
The other set of NO contacts receives the signal
from the parking brake switch through the pur-
ple wire. When the brake pedal is down, the con-
tacts close, sending that signal to the RMC
module through the black wire with white trace.
12