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Home > Ordnance Documents and other related manuals > > Troubleshooting - Od16720090
Figure 36. Master Relay and Batteries
Table 1. Specific Gravity --Cold Climate

Maintenance of the M88A1
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MAINTENANCE OF THE M88A1 - OD1672 - LESSON 3/TASK 2
with the STE/ICE (simplified test equipment for internal combustion engines)
or  a  multimeter,  the  fault  isolation  functions  described  in  this  task
prescribe the use of a multimeter.
For instructions on the use of the
multimeter, refer to paragraph 1-19, Section V, TM 9-2350-256-20.
It is
understood that troubleshooting any portion of the electrical system is a
complex procedure.  The troubleshooting procedure provided here will involve
only the performance of those fault isolation functions required for the
detection of a defective starter.
b.
Troubleshooting.  Listed below is an example of the correct procedure
unit personnel would follow for troubleshooting, maintenance, and repair of
the M88A1 starting system, specifically: ENGINE FAILS TO CRANK WHEN STARTER
SWITCH IS PRESSED.
Step 1.  Perform the battery serviceablilty test.  Testing the batteries for
serviceability  is  determined  by  checking  the  specific  gravity  of  the
electrolyte, and the terminal voltage.  Batteries are in good condition and
serviceable when all of the following are met: (If any criteria are not met,
the  batteries  should  be  recharged  and  checked  again.
If  the  correct
readings  are  not  obtained  after  recharging,  the  batteries  should  be
replaced.)
(1) Use a specific gravity thermometer to check the specific gravity of
the electrolyte in each battery; the specific gravity readings should be
between 1.250 and 1.300 corrected to 80 F.
In a tropical climate, the
specific battery reading should be between 1.200 and 1.225.
The specific
gravity between individual cells should not vary by more than .040.
To
ensure proper starting under cold climate conditions, the specific gravity
of a battery should be maintained between 1.275 and 1.300 corrected to 80
F.
The freezing point of a battery's electrolyte depends on its specific
gravity.
Care must be taken never to allow the specific gravity to drop
below that value at which electrolyte freezing would occur; this can be done
by keeping the batteries charged, or by increasing the acid concentration in
the  electrolyte.
The  electrolyte  freezing  temperature  versus  specific
gravity reading for the M88A1 recovery vehicle batteries is provided in
Table 1, on the following page.
82






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