Electrical System Battery Check
MAINTENANCE CHECK
Observe all instruments and gauges while operating machine and carrying out your DAILY
MAINTENANCE CHECKS. Replace or repair any malfunctioning instruments or gauges.
BATTERY
The maintenance-free batteries are located under the battery cover on the left-hand side of
machine for the T300-1 and on the right-hand side for the T500-1 & T780. Use maintenance-
free battery charging information.
A maintenance-free battery does not require the addition of water during its life in normal
service. This is due to the fact that maintenance-free batteries produce little gas at normal
charging voltages.
TESTING MAINTENANCE-FREE BATTERIES
WHENEVER THE BATTERY IS PLACED ON CHARGE, WEAR SAFETY GLASSES.
DO NOT BREAK "LIVE" CIRCUITS AT THE BATTERY TERMINALS. Maintenance-
free batteries of the latest design incorporate flame arrester vents to reduce the
possibility of explosions caused by external sparks. Therefore, during charging,
the vents, if removable, should remain in place. A wet cloth should be placed
over the vent openings as an additional precaution.
Step 1 - Visual Inspection
Visually inspect the outside of the battery for obvious damage such as a cracked or broken
case or cover which would allow electrolyte loss. Check for terminal damage. If obvious
physical damage is found, replace the battery. If possible, determine the cause of damage
and correct.
Check the condition and size of the cables. Are the cable clamps tight? Check for
corrosion on the terminal or clamps. Clean corroded parts and/or tighten clamps if
necessary. Replace badly corroded cables or cables with defective terminals. Make certain
the negative cable is making a good connection where it is grounded to the engine and the
positive cable to the starter relay. If the "Visual Inspection" is satisfactory, proceed to Step 2.
Step 2 - Electrolyte Levels And State Of Charge
Check the electrolyte level in the cells if possible. The level can be seen through translucent
plastic cases. It can also be checked in batteries which are not sealed. If the electrolyte
level is below the tops of the plates in any cell, add water if the vents are removable. If the
battery is sealed, and water cannot be added to it, replace the battery and check the
charging system for a malfunction such as a high voltage regulator setting. Follow
instructions of manufacturer if the battery has a special indicating device.
If the level is O.K., unknown, or water can be added to the battery, and the stabilized open
circuit voltage is below 12.4 volts, charge the battery as described under "Charging". The
voltage is stabilized if the battery has stood overnight without being charged or discharged.
T300-1_T500-1_T780
Service / Parts
488 P/N 12261-683
REVISED: January 2015
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