Electrical System

6.Electrical System

The electrical system on the modern tractor is to all practical purposes indispensable. By medium of electrical energy stored in the battery and replenished by the alternator, essential services are provided for starting the engine, lighting and operating accessories.

A.THE BATTERY

In general the lead acid cell is a device which stores electrical energy as chemical energy. The process of conversion of this energy is ready reversible and commonly referred to as a battery.

1.Construction

Each cell has one set of positive plates and one set of negative plates placed alternately and insulated by separators which not only prevent plates from touching but also holds the active material in the plate grids. This assembly is immersed in a solution of dilute sulphuric acid known the electrolyte.

2.Principle of Operation

As the battery is charged by passing a current through it the material on the positive plates is converted to lead peroxide and the negative plates to lead sponge. In this process the acid becomes more highly concentrated and so its specific gravity rises. As the battery is discharged the active material on both plates is converted into lead sulphate robbing the acid of its sulphur.

3.BATTERY REMOVAL a.Open the hood. b.Remove the battery cable from its negative terminal and then positive terminal. c.Remove the wing nut (A) of the Battery holding bracket stay rods (B), and take away the bracket(C). d.Take away the Battery

4.INSTALLATION

Installation is reverse procedure of removal.

NOTE:When you are using sealed battery there is no need of top up the electrolyte.

NEVER allow a battery to stand discharged. NEVER operate for any length of time with the battery in a low state of charge — recharge.

ALWAYS keep terminal posts and cable clamps clean and tight — NEVER scrape posts but clean with wire wool or emery paper, a light coating of petroleum jelly gives good protection against corrosion.

CHECK battery case retaining bolts and mountings regularly — poor mounting can cause extensive damage. NEVER overcharge for any length of time.

Sealed battery cannot test for specific gravity.