WheelHorse Engine Electrical Service Manual

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ELECTRICAL SERVICE MANUAL WHEEL HORSE Table of Contents – Page 1 of 1 INTRODUCTION SECTION I - BATTERY HOW IT WORKS HOW TO USE A HYDROMETER HOW TO PREPARE A DRY CHARGED BATTERY FOR SERVICE PROCEDURE FOR TESTING BATTERIES SECTION II - CHARGING SYSTEM ALTERNATOR CHARGING SYSTEMS - KOHLER - ONAN ENGINES BRIGGS & STRATTON ALTERNATOR SYSTEMS TECUMSEH 7 AMP REGULATED CHARGING SYSTEM (LT-1032) SECTION III - COMPONENTS SECTION IV - WIRING DIAGRAMS SECTION V - TROUBLE-SHOOTING EXAMPLES

CTRICAL SERVICE

PART NO. 810291 R 2 Printed in U.S.A. 0385

INTRODUCTION This manualcovers A and B-Series 1980-83 and C-Series 1978-83Tractors. For 1984 and later tractors, refer to Section 18 in Parts and Service manuals for electrical components and wiring diagrams.

CONTENTS Page

.......................... How It Works. ............................... How To Use a Hydrometer.. . . . . . . . . . . . . . . . . . . How To Prepare a DryCharged Battery. . . . . . . . . . Procedure For Testing Batteries. ............... SECTION I I CHARGING SYSTEM.. ...............

SECTION I - BATTERY..

AlternatorChargingSystems Onan Engines

- Kohler . . . . . . . . . .

SECTION III - COMPONENTS.

1-5

1 2 3 4 6-10 6

.................... 11-16 SECTION IV WIRING DIAGRAMS.. . . . . . . . . . . . . . 17-40 SECTION V-TROUBLESHOOTING EXAMPLES.. ..... 41-47 -

I

SECTION I .

HOW IT WORKS

A battery

- BATTERY

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produces electricity as the result of a chemical

reaction. The sulfuric acid in the electrolyte combines with the positive and negative plates to form anew chemical compound called lead sulfate. The amount of sulfuric acid consumed by the platesprois portional to the amountof electricityproduced. Therefore, the more electricity produced the less' sulfuric acid remains in the electrolyte. i The gradual weakeningof the electrolyte letsus measure, with a hydrometer, the amountof unused acid in the water, and thus how much potential energy is left.

DOWN

C FU HLAGLRO YGI N ED G Acid in water gives electrolyte specific gravity of 1.265.

DISCHARGED

As battery discharges, acid begins to lodge in plates. Specific gravity drops.

END/LIFE

Battery half discharged. Acid almost entirely in Moreacid in plates, less inplates.leavingweakelectroelectrolyte. Starting lyte behind. Specific gravity lower, almost that of water. failure likely.

BATTERY CHEMISTRY

-1-

HOW TOUSE

A HYDROMETER

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The hydrometer is a direct-reading instrument to used measure the specific gravity (Spg). In reading a hydrometer, the barrel must be held vertically. To apply the test it is only necessary to draw a sample of electrolyte from a cell and jiggle the hydrometer to be sure the indicator is floating free and record the indicated Spg.DO N O TM A I N T A I NL I Q U I DL E V E LI N T H E HYDROMETER BY SQUEEZINGTHE BULB A ST H I SG I V E SI N A C C U R A T E READINGS. The float shouldnot touch any part o f the barrel. A full charge battery equals 1 . 2 6 5 specific

gravity(Spg) unless otherwise specified. Replace battery if there is 50 (0.050) or more points variation between highest and lowest cell. Spg. varieswith temperature, so for' correct readings the electrolyte temperature should be 60°F at or higher.

High float (left) means high specific gravity. Low float means low specific gravity.

READING

Correct method of reading hydrometer. Eye onlevel with liquid surface. Disregard curvature liquid of against glass parts. b o not t i It hydrometer while reading. Keep float vertical.

HYDROMETER

HOW TO PREPARE A DRY CHARGED BATTERY FOR SERVICE

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A. Remove ventcaps. Remove o r destroy any sealingdevice which may ha