ASTEC RT130, Operator'S Manual, Page: 41 / 64

37 AU106984 G7B
ADJUSTMENT/MAINTENANCE
FUSE REPLACEMENT
RT130048B
The electrical system is protected by a 5-ampere fuse. If
the fuse burns out, neither the electric starter nor any
electrical function will operate. The engine can be started
manually if this fuse burns out, however, electrical
functions will not operate. Check this fuse if the electrical
functions do not operate.
The battery charging circuit is protected by another 5-
ampere fuse. If this fuse burns out, electrical functions
will operate but running the engine will not charge the
battery. Check this fuse if the battery is not being
charged.
1. Remove the nine screws from the engine cover.
2. Find three fuse holders in the wiring harness.
The first fuse holder from the alternator contains a diode.
Do not remove this diode. The second fuse holder from
the alternator (1) contains the battery charging circuit
fuse. The fuse holder closest to the ignition switch (2)
contains the electrical system fuse.
3. Remove the fuse cover, then pull out and inspect the
fuse.
4. If the fuse is burnt out, discard the burnt-out fuse.
Install a new 5-ampere fuse, and reinstall the fuse
cover.
NOTE:
Never use a fuse with a rating greater than 5
amperes. Serious damage to the electrical system or a fire
could result.
5. Reinstall the engine cover. Install the nine screws and
tighten securely.
Frequent fuse failure usually indicates a short circuit or an
overload in the electrical system. If a fuse burns out
frequently, take the machine to an authorized Astec
service dealer for repair.
SPARK PLUG SERVICE
Recommended spark plugs: BPR6ES (NGK)
W20EPR-U (DENSO)
The recommended spark plug is the correct heat range
for normal engine operating temperatures.
NOTE:
Incorrect spark plugs can cause engine damage.
1. Disconnect the spark plug cap, and remove any dirt
from around the spark plug area.
2. Remove the spark plug with a 13/16 inch spark plug
wrench.
RT130012
3. Inspect the spark plug. Replace it if damaged, badly
fouled, if the sealing washer is in poor condition, or if
the electrode is worn. Clean the spark plugs with a
wire brush if you are going to reuse them.
RT130013
4. Measure the spark plug electrode gap with a suitable
gauge. The gap should be 0.028 - 0.031 inch (0.70 -
0.80 mm). Correct the gap, if necessary, by carefully
bending the side electrode.
5. Install the spark plug carefully, by hand, to avoid
cross-threading.
6. After the spark plug seats, tighten with a 13/16 inch
spark plug wrench to compress the washer.
7. If reinstalling used spark plugs, tighten 1/8 - 1/4 turn
after the spark plug seats. If installing new spark
plugs, tighten 1/2 turn after the spark plug seats.
8. Attach the spark plug cap to the spark plug.
NOTE:
A loose spark plug can overheat and damage the
engine. Overtightening the spark plug can damage the
threads in the cylinder head.
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