FUEL
SYSTEM
The John Deere engines used on the DDB sets are
designed for use with ASTM No.2 Diesel
fuel.
They
will however, operate on diesel fuels within the
specifications delineated in the John Deere engine
manual.
FUEL
CONNECTIONS
Check local regulations governing the installation of
a fuel supply tank.
In any diesel engine installation,
fuel,
system cleanliness is of
utmost importance. Make every effort to prevent entrance of
moisture or contaminants of any
kind.
Do not use lines or fittings of
galvanized material.
A fuel lift in excess of 10-feet is not recommended
without a day tank installation, because of fuel
drainage. Horizontal run, if the supply tank is level
with the fuel pump should not exceed 25-feet.
However, a day tank is again recommended.
The fuel inlet is to the transfer pump and is threaded
for
1/8-ipch
pipe. Injector pump return line is com-
mon with the injectors' retum line, and requires a 1/8-
inch low pressure hose connection.
FIGURE 9. BATTERY CONNECTION
DAY
TANK
Generator set installations may be equipped with an
optional integral fuel Day tank. A float operated valve
controls fuel flow of up to 300 psi into the fuel tank.
The correct level is maintained to assure a constant
source of
fuel.
It is necessary to install an overflow
line between the Day tank and the main fuel tank.
Refer to the installations included with the tank. See
Figure 8 for an example of a Day tank installation.
BATTERY
Starting the plant requires 12-volt battery current.
Use two 6-volt (see specification) batteries for a
normal installation. Connect the batteries in series
(negative post of first battery to positive post of
second) as in Figure 9. Necessary battery cables are
on unit. Service the batteries as necessary. Infrequent
plant use (as in emergency standby service) may
allow the batteries to self-discharge to the point
where they cannot start the plant. If installing an
automatic transfer switch that has no built-in charge
circuit, connect a separate trickle charger. Onan
automatic transfer switches include such a battery
charging circuit.
WARNING
Do not smoke while servicing batteries. Lead
acid batteries give off explosive gases while.
being charged.
BATTERY,
HOT LOCATION
Batteries will self discharge very quickly when in-
stalled where the ambient temperature is consistently
above 90°F, such as in a boiler room. To lenghten
battery life, dilute the electrolyte from its normal 1.275
specific gravity reading at full charge to a 1.225
reading.
The cranking power is reduced slightly when
the electrolyte is so diluted, but if the temperature is
above 90° F, this should not be noticed. The lengthen-
ed battery life will be worth the effort.
1.
Fully charge the battery.
2.
With the battery still on charge, draw off the
electrolyte above the plates in each
cell.
DO NOT
ATTEMPT TO POUR OFF; use an hydrometer or
filler bulb and dispose of it in a safe manner. Avoid
skin or clothing contact with the electrolyte.
3. Refill each cell with distilled water, to normal
level.
4.
Continuecharging fori hourata4to6hourrate.
5. Test each
cell.
If the specific gravity is still above
1.255,
repeat steps 2, 3, and 4 until the reading is
reduced to
1.225.
Usually, repeating steps twice is
sufficient.
15
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