Cub Cadet 28HP Tank 53AB5JEZ630, Operator'S And Service Manual, Page: 20 / 36

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c. Store the battery with a full charge. A dis-
charged battery will freeze (refer to the table
below).
Specific Gravity Freezing Temp (°F)
1.265 -71
1.250 -62
1.200 -16
1.150 5
1.100 16
d. Recharge battery when ever the specific
gravity value is less than 1.225
3. Battery Removal
Warning:
When removing the cables from the battery fol-
low these steps to avoid a short between the
wrench and the frame.
a. Remove the Negative (black) cable.
b. Remove the Positive (red) cable.
c.
Release the hold down straps.
d. Remove the battery without tipping.
4. Installing the Battery
Note:
The battery is delivered from the factory
fully charged and filled with electrolyte.
a. Attach the Positive (red) cable.
b.
Attach the Negative (black) cable.
c. Attach the rubber battery strap.
5. Jump Starting
Warning:
Failure to use this starting procedure can cause
sparking, and the gases in the battery to
explode.
a. Attach the end of the red jumper cable to the
Positive terminal (+) of the charged battery.
b. Attach the other end of the red jumper cable
to the Positive terminal (+) of the low charge
battery.
c. Attach the end of the black jumper cable to
the Negative terminal of the charged battery.
d. Attach the other end of the black jumper
cable to the frame of the unit with the low
charge battery.
6. Fuses: There are two fuses located in the wiring
between the ignition and start switch and other
electrical components. This is a standard plug-in
type automotive fuse rated at 30 amp for the
main harness and 5 amp for the glow plug
switch and 30 amp for the radiator fan.
7. Safety Switches: There are three safety
switches in the electrical circuit which control the
engine. They are (1) the blade clutch switch, (2)
the steering lever/parking brake switch, (3) the
seat switch.They operate so that in order to start
the engine, the blade clutch switch must be off,
the parking brake must be engaged, and both
steering levers must be in the neutral position.
Once the engine is started, the seat must be
occupied and the parking brake must be
released before either of the steering levers can
be moved. Also, the seat must be occupied
before the blade clutch switch can cause the
blades to rotate.
8. Safety Switch Operation Checks: The follow-
ing operational checks should be made daily.
a. Blade Clutch Switch: Sit in the operator’s
seat. With both steering levers in the neutral
position and the parking brake engaged, turn
the blade clutch switch “on” and try to start
the engine. The engine should not start. If it
does, the blade clutch switch must be
replaced. If the engine does not start, turn
the blade clutch switch “off” and start the
engine. Now turn the blade clutch switch “on”
and the blades should rotate. If the blades do
not turn, the blade clutch switch must be
replaced, the seat switch must be replaced or
the electric PTO clutch must be repaired.
The air-gap should be checked every 100
hrs. (or less, if severe operating conditions
exist such as when there are many on/off
cycles, mulching operations, material collec-
tion systems used, and dusty/dirty condi-
tions), and the air-gap adjusted if more than
0.025". To inspect, remove the “negative”
cable from the battery and all sparkplug
wires. The air-gap should be checked with
feeler gages in the three slots of the BBC
(PTO Clutch). See page 24 for air gap adjust-
ment specs. There are three inspection slots
in the brake cover. To adjust, successively
tighten each of the three gap adjustment nuts
an equal amount. Insert a feeler gage (see
page 24 for specs) into each slot as the air
gap adjustment nut are tightened. The cor-
rect adjustment occurs when slight contact
with the feeler gage occurs. Engage the BBC
(PTO Clutch) a couple of times, and re-check
the air-gap. If it is not between the specs
listed on page 24, repeat the adjustment pro-
cedure.
b. Steering lever/Parking Brake Switch: Sit in
the operator’s seat. With both steering levers
in the neutral position and the blade clutch
switch “off”, release the parking brake and try