Section 3; General - Manitowoc Grove CD3340B Service Manual

CD3340B/YB4411
SECTION CONTENTS

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Comparing Electrical System to a Hydraulic
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Magnetism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Main Electrical System. . . . . . . . . . . . . . . . . . . . . . 3-3
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Wire Harnesses . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Fuse and Relay Replacement. . . . . . . . . . . . . . . . 3-3
Charging System . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Alternator and Voltage Regulator . . . . . . . . . . . . . 3-7
Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Voltmeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Resistor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Special Precautions . . . . . . . . . . . . . . . . . . . . . . . 3-7
Battery Maintenance and Charging . . . . . . . . . . . 3-7
Battery Replacement . . . . . . . . . . . . . . . . . . . . . . 3-8
Starting Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
General Inspections . . . . . . . . . . . . . . . . . . . . . . . 3-8
GENERAL
To aid in the understanding and troubleshooting of an
electrical system, review the terms and information that
follows.
CAUTION
K no w t he el e ct r i ca l ci r c ui t be fo r e c on ne ct in g or
disconnecting an electrical component. A wrong
connection can cause personal injury or damage to the
component and/or system.
Electrical Energy - power which comes from the movement
of electrons. Electrons are particles with a negative charge.
Electrons will collect around particles with a positive charge,
called protons, until an electrical imbalance occurs.
Amperage - rate of flow of electrons (CURRENT), measured
in amperes.
Voltage - the electromotive force (EMF) which causes
electrons to move through an electrical circuit, measured in
volts.
GROVE

SECTION 3

ELECTRIC SYSTEM
Starting Circuit Check . . . . . . . . . . . . . . . . . . . . . . 3-8
Instrument and Light Circuits . . . . . . . . . . . . . . . . 3-9
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Light Bulbs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Gauges and Indicators. . . . . . . . . . . . . . . . . . . . . . 3-9
ECM Display Toggle Switch . . . . . . . . . . . . . . . . . 3-9
Accessory Circuits . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Anti-Double Blocking System . . . . . . . . . . . . . . . 3-10
Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Wire Harnesses . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Engine Wire Harness. . . . . . . . . . . . . . . . . . . . . . 3-11
Transmission Wire Harness. . . . . . . . . . . . . . . . . 3-11
Main Frame Wire Harness. . . . . . . . . . . . . . . . . . 3-11
Instrument Panel Wire Harness. . . . . . . . . . . . . . 3-11
Cab Wire Harness . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
Charging System Troubleshooting . . . . . . . . . . . 3-19
Starting System Troubleshooting. . . . . . . . . . . . . 3-20
Resistance - any resistance to flow of electrons in an
electrical circuit, measured in Ohms.
Ohm's Law - "Electric current increases in direct relation to
the voltage and decreases in relation to the amount of
resistance in any circuit."
To Find:
EMF (Vol tage) - Multiply CURRENT (amps) by
RESISTANCE (Ohms)
RESISTANCE (Ohms) - Divide EMF (voltage) by
CURRENT (amps)
C U R R E N T ( A m ps ) - D i v i d e E M F ( v o l t a g e ) b y
RESISTANCE (Ohms).
Consider the following when trying to find trouble in an
electrical system:
1. Current always flows from (+) positive to (-) negative, or
from the point of highest voltage.
2. Because the system used on this machine is a negative
ground system, current that leaves the supply (battery)
returns to the supply (battery).
Published 04/07/2015 Control # 569-00
ELECTRIC SYSTEM
3-1
3