ELECTRICAL SYSTEM
93
Introduction
This chapter is divided into four sections:
•
Section 1:
About this chapter and precautions
•
Section 2:
Components
This section will describe the location and opera-
tion of the electrical components on the tractor.
Where appropriate, some disassembly or com-
ponent removal instructions will be included.
•
Section 3:
Diagnostic Techniques
This section will cover basic tools, techniques,
and methodology for diagnosing electrical issues
on the tractor. A lot of the information in this sec-
tion can be applied to other equipment.
•
Section 4:
Schematics
Precautions
CAUTION:
Before disconnecting any electrical
component, take precautions to prevent the
component or the wires attached to it from short-
ing out. The most effective means of doing this
is to disconnect the battery ground cable from
the negative battery terminal.
CAUTION:
Unless performing tests that require
the electrical system to be in operation, discon-
nect the negative cable from the battery before
doing any work to the electrical system of the
tractor.
Components
The 900 series tractor uses a similar REV-TEC mow in
reverse electrical system to the older Cub Cadet 1000
series.
RMC Module
The RMC module contains electronic logic circuits.
When diagnosing anything that is connected to the
RMC module, a high impedance test light or a high
impedance digital multi-meter (DMM) must be used.
The amperage draw of a standard incandescent test
light may over-burden some internal electronic circuits,
burning-out the module.
NOTE:
These tools are not outrageously expen-
sive or exotic. High impedance test lights (Thex-
ton model 125 is typical) can be purchased
locally from stores like NAPA for under $30.00.
Appropriate multi meters can be purchased for
under $100.00, and are an invaluable tool for
any competent technician.
•
It is typical when industries shift from electro-
mechanical to electronic controls that diagnosis
shifts from tracing through a number of indepen-
dent circuits to checking the in-puts to and out-
puts from a central processor. This is similar to,
but much less complex than the transition that
the auto industry made with the conversion to
fuel injection in the 1980s.
NOTE:
The starter safety circuit has no connec-
tion to the RMC module.
•
The only one switch in the safety circuit that is
capable of turning-off the engine works through
the RMC module.
•
It is still important to be familiar with the workings
of the individual components of the electrical
system, but some of them can now be checked
from a central point on the tractor. This makes
life easier on the technician, frequently making it
unnecessary to connect to difficult to reach
switches in the preliminary stages of trouble-
shooting.
•
The function of individual safety switches can be
seen as providing information “inputs” to the
RMC module.
•
The next part of this section gives a detailed
description of the electrical components on this
tractor, their function in the system, and their
physical location on the tractor. Armed with this
information and the proper tools, a technician
should be able to efficiently diagnose most elec-
trical problems.
CHAPTER 7: ELECTRICAL SYSTEM
Summary of Contents for 900 series
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