Mahindra 3535, Service Manual

Page: 287 / 368

G-19 35 Series 4WD, Model - 3535, 4035, 4535 and 5035 SM June’08
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.
Electrical System
Negative
(–)
Positive
(+)