October 2008 "3072ES / 3772ES / 3772ES HD" Service & Parts Manual
Page 2-4
BATTERIES
CHARGING BATTERIES CREATES EXPLOSIVE HYDROGEN GAS. KEEP SPARKS,
FLAMES AND SMOKING MATERIALS AWAY FROM BATTERIES.
ALWAYS WEAR SAFETY GLASSES WHEN WORKING WITH BATTERIES.
BATTERY FLUID IS CORROSIVE. THOROUGHLY RINSE SPILLED FLUID WITH
CLEAN WATER.
REPLACE WITH MANUFACTURER APPROVED BATTERIES.
BEFORE DISCONNECTING THE BATTERY NEGATIVE (–) LEAD, MAKE SURE THAT
ALL SWITCHES ARE OFF. IF ON, A SPARK WILL OCCUR AT THE GROUND
TERMINAL THAT COULD IGNITE HYDROGEN GAS VAPORS.
Eight (8), 6 Volts DC batteries supply the 48 Volts DC electrical power required to operate the electri-
cal circuits.
One 12 Volts DC battery supplies power to operate the emergency lowering circuit for the 3772ES.
Battery Maintenance (in storage)
Follow these procedures for maintenance of battery on a machine not in use:
• Keep battery clean. Electrolyte of “wet” lead acid type flooded batteries should be checked
regularly and kept at proper level.
• Never stack one battery directly on top of another because post or container damage can
result. If batteries are stored individually, place supporting boards between layers. Rotate stock
so that oldest batteries are used first.
• “Wet” batteries should be kept fully charged. A “wet” battery, while in storage, should be re-
charged to full charge at recommended intervals. Leaving the MEC charger connected to an
un-switched AC power source during prolonged storage will maintain battery voltage automati-
cally.
A battery fully (100%) charged at 80° F (26.6° C)
- drops to 65% at 32 °F (0° C)
- drops to 40% at 0° F (–32° C)
Recommended Intervals
If Stored At: Recharge:
Below 40° F (4° C) None required
Above 60° F (15° C) Every month
40°-60° F (4°-15° C) Every 2 months
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