244 TRACTOR ELECTRICAL DEMYSTIFICATION GUIDE Table of Contents – Page 1 of 1 244PARTS LIST PARTS LIST GLOSSARY ALTERNATOR CLUTCH, ELECTRIC COIL, IGNITION REGULATOR, VOLTAGE RELAY SWITCH, IGNITION SWITCH, LIGHT SWITCH, NEUTRAL SWITCH, PTO SWITCH, SEAT SCHEMATIC CIRCUIT DIAGRAMS STARTER MOTOR CIRCUIT SPARK CIRCUIT SPARK CIRCUIT CHARGING CIRCUIT ELECTRIC CLUTCH CIRCUIT LIGHT CIRCUIT
ELECTRICAL DEMYSTIFICATION BOOKLET
Parts List 3 Component Glossary 4 Electrical Schematic 9 Circuit Diagrams 2 10
Parts List Description Number Part Number Glossary Page Alternator.. .NN10734.. 4 Clutch, Electrlc Coil, Ignition Regulator, Voltage Relay Switch, Ignition.. Switch, Light.. Switch, Neutral Switch. PTO Switch, Seat. .NN10730.. NN10261 116397 .116338.. 6 .102138.. 7 .115230 .78-3030 .
Alternator Part Number NN10734 Purpose To produce current for battery charging, electric clutch and any other electrical accessories on the tractor. Capacity: 20 Amps. Alternator How It Works The alternator (or stator) is simply a coil of fine wire wrapped on an iron core. As the magnet in the flywheel passes by it, current is produced. Because a magnet hasa north and south pole, half of the current produced is in one direction and half is in the other. This type current is AC or alternating current.
Coil, Ignition Part Number NN10730 Purpose Provides voltage necessaryto fire spark plug. How It Works Magnets on the flywheel passing by the primary windings in the coil create a changing field around the coil togenerate current. A second coil, called the secondary, is also wound around the same iron core. This second coil is used to “step up” the voltage. It uses smaller wireand more windings to dothis. The two coilsalone arenot enough to produce the 20,000 volts necessary to fire the plug.
Relay Part Number 11 6397 Purpose Uses current in one circuit to flipa NO (normally open) or NC (normally closed) switch in another independent circuit. Switching Relay (energized) Switching Relay (not energized) How It Works A relay is actually two simpler parts working together: 1. Coil: Terminals 85 and 86 are connected to a coil. Applying 12 volts to these terminals energizes the coil turning it intoan electromagnet. 2.
Switch, Light Part Number 102138 Purpose PTO Switch (on) Provides switching for lights. How It Works Contacts inside the switch electrically connect the two terminals. Testing Check the resistance betweenthe two terminals with the switch disconnected from the circuit. Resistance should be 0 ohms when on and infinity when off. Switch, Neutral Part Number 115230 Purpose Neutral Switch Determines if shift lever or traction lever is in neutral.
Part Number 78-3030 Switch, PTO Purpose Provides switching for two circuits: PTO clutch and the safety circuit. Handle on switch requires the operator to provide two step input to help prevent accidental engagement. I How It Works Contacts inside the switch electrically connect various terminals.This switch is a double pole, double throw (DPDT) switch. Here's what this fancy terminology means: Switch (D.P.D.T.) Double Pole: E Think of this as the number of input lines.
L SEAT SWITCH ELECTRICALCONN.
Starter Motor Circuit (ignition switch in start position) Re 0 LEI m Solenoid Bk (energized) 0 - w Bk Switching Switch position)(shown in start Start Relay (energized) - - - 1 - Relay (energized) ion Switch m Pu - E+L+S Spark Circuit (ignition switch in start position) I n W Pu Fuse IgnMn Smtch 10 Battery Re Re -- - 23A Or ~-o Pu Neutral Switch (in neutral) Ignition Switch (shown in start position) B r B r PUTD PTO Switch (Off) Kill Relav I
rs\ Spark Circuit (ignition switchin run) Wire e4 __ _-.___- Kill Pu Br PTO Switch (in neutral) - in 25A Ignition Switch (shown run position) y -B -.
--- Electric Clutch Circuit - I Banery 1ZV Fuse 25A A lgnil w- -23lBk Fuse Fuse 25A Ignition Switch, (shown in run posltlon) 15A JGn -Headlights 12
