Checking The Interlock System; Towing The Traction Unit; Standard Control Module (Scm) - Toro 30839 Operator's Manual

Checking the Interlock System

Service Interval: Before each use or daily
CAUTION
If safety interlock switches are disconnected or
damaged the machine could operate unexpectedly
causing personal injury.
• Do not tamper with the interlock switches.
• Check the operation of the interlock switches
daily and replace any damaged switches before
operating the machine.
1. Make sure that all bystanders are away from the area
of operation. Keep hands and feet away from the
cutting units.
2. While sitting on the seat, the engine must not start
with either the cutting unit switch engaged or the
traction pedal engaged. Correct the problem if it is
not operating properly.
3. While sitting on the seat, put the traction pedal in
neutral, the parking brake off, and the cutting unit
switch in the Off position. The engine should start.
Rise from the seat and slowly press the traction
pedal, the engine should stop in one to three
seconds. Correct problem if it is not operating
properly.
Note: The machine is equipped with an interlock
switch on the parking brake. The engine will stop if
the traction pedal is pressed with the parking brake
engaged.

Towing the Traction Unit

In case of an emergency, the machine can be towed for
a short distance; however, Toro does not recommend
this as a standard procedure.
Important: Do not tow the machine faster than 2
to 3 MPH (3 to 4 km/h) because the drive system
may become damaged. If the machine must be
moved a considerable distance, transport it on a
truck or trailer.
1. Locate the bypass valve on the pump (Figure 27)
and rotate it 90°.
1. Bypass valve
2. Before starting the engine, close the bypass valve by
rotating it 90° (1/4 turn). Do not start the engine
when the valve is open.
Standard Control Module
(SCM)
The Standard Control Module is a potted electronic
device produced in a one size fits all configuration. The
module uses solid state and mechanical components
to monitor and control standard electrical features
required for safe product operation.
The module monitors inputs including neutral, parking
brake, PTO, start, backlap, and high temperature. The
module energizes outputs including PTO, Starter, and
ETR (energize to run) solenoid.
The module is divided into inputs and outputs. Inputs
and outputs are identified by green LED indicators
mounted on the printed circuit board.
The start circuit input is energized by 12 VDC. All
other inputs are energized when the circuit is closed to
ground. Each input has a LED that is illuminated when
the specific circuit is energized. Use the input LED's
for switch and input circuit troubleshooting.
Output circuits are energized by an appropriate set of
input conditions. The three outputs include PTO, ETR,
and START. Output LED's monitor relay condition
indicating the presence of voltage at one of three
specific output terminals.
Output circuits do not determine output device
integrity so electrical troubleshooting includes output
LED inspection and conventional device and wire
harness integrity testing. Measure disconnected
component impedance, impedance through wire
harness (disconnect at SCM), or by temporarily "test
energizing" the specific component.
The SCM does not connect to an external computer or
hand held device, can not be re–programmed, and does
not record intermittent fault troubleshooting data.
27
Figure 27