Section 3 • Scheduled Maintenance Procedures
REV B
September 2016
3 - 10 GRC Part No. 227123
CHECKLIST B PROCEDURES
Models without maintenance-free or sealed
batteries:
9 Remove the battery vent caps and check the
specific gravity of each battery cell with a
hydrometer. Note the results.
10 Check the ambient air temperature and adjust
the specific gravity reading for each cell as
follows:
• Add 0.004 to the reading of each cell for
every 10° / 5.5° C above 80° F / 26.7° C.
• Subtract 0.004 from the reading of each cell for
every 10° / 5.5° C below 80° F / 26.7° C.
Result: All battery cells display an adjusted
specific gravity of 1.277 +/- 0.007. The battery
is fully charged. Proceed to step 14.
Result: One or more battery cells display a
specific gravity of 1.217 or below. Proceed to
step 11.
11 Perform an equalizing charge OR fully charge
the batteries and allow the batteries to rest at
least 6 hours.
12 Remove the battery vent caps and check the
specific gravity of each battery cell with a
hydrometer. Note the results.
13 Check the ambient air temperature and adjust
the specific gravity reading for each cell as
follows:
• Add 0.004 to the reading of each cell for
every 10° / 5.5° C above 80° F / 26.7° C.
• Subtract 0.004 from the reading of each cell for
every 10° / 5.5° C below 80° F / 26.7° C.
Result: All battery cells display a specific gravity
of 1.277 +/- 0.007. The battery is fully charged.
Proceed to step 14.
Result: One or more battery cells display a
specific gravity from 1.269 to 1.218. The battery
is still useable, but at a lower performance so
will need to be recharged more often. Proceed
to step 14.
Result: One or more battery cells display a
specific gravity from 1.217 to 1.173. The battery
is approaching the end of its life. Proceed to
step 14.
Result: The difference in specific gravity
readings between cells is greater than 0.1 OR
the specific gravity of one or more cells is 1.172
or less. Replace the battery.
14 Check the battery acid level. If needed,
replenish with distilled water to
1
/8 inch / 3 mm
below the bottom of the battery fill tube. Do not
overfill.
15 Install the vent caps and neutralize any
electrolyte that may have spilled.
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