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4.5
SPARK PLUG(S)
Reset the spark plug(s) gap or replace the spark plug(s) as neces-
sary. See the Service Schedule section for maintenance require-
ments.
1.
Clean the area around the base of the spark plug(s) to keep
dirt and debris out of the engine.
2.
Remove the spark plug(s) and check the condition. Replace
the spark plug(s) if worn or if reuse is questionable. See the
Service Schedule section for recommended inspection. Clean
by scraping or washing using a wire brush and commercial
solvent. Do not blast the spark plug(s) to clean.
3.
Check the spark plug gap using a wire feeler gauge. Adjust the
gap to 0.76 mm (0.030 inch) for 8, 10 and 20kW; and 1.02
mm (0.040 inch) for 14 and 17kW by carefully bending the
ground electrode (Figure 4.8).
Figure 4.8 – Setting the Spark Plug Gap
SET PLUG GAP AT 0.76 mm (.030 inch) - 8, 10 &
20kW; 1.02 mm (.040 inch) - 14 & 17kW
4.6
BATTERY MAINTENANCE
The battery should be inspected per the "Service Schedule" sec-
tion. The following procedure should be followed for inspection:
1.
Inspect the battery posts and cables for tightness and corro-
sion. Tighten and clean as necessary.
2.
Check the battery fluid level of unsealed batteries and, if nec-
essary, fill with Distilled Water Only. Do not use tap water in
batteries.
3.
Have the state of charge and condition checked. This should
be done with an automotive-type battery hydrometer.
DANGER
Do not dispose of the battery in a fire. The
battery is capable of exploding.
A battery presents a risk of electrical shock
and high short circuit current. The following pre-
cautions are to be observed when working on
batteries:
• Remove the 7.5A fuse from the generator control
panel.
• Remove watches, rings or other metal objects;
• Use tools with insulated handles;
• Wear rubber gloves and boots;
• Do not lay tools or metal parts on top of the
battery; and
Section 4 — Maintenance
Air-cooled Generators
• Disconnect charging source prior to connecting or
disconnecting battery terminals.
Do not open or mutilate the battery. Released
electrolyte has been known to be harmful to the
skin and eyes, and to be toxic.
The electrolyte is a dilute sulfuric acid that is
harmful to the skin and eyes. It is electrically
conductive and corrosive. The following
procedures are to be observed:
• Wear full eye protection and protective clothing;
• Where electrolyte contacts the skin, wash it off
immediately with water;
• Where electrolyte contacts the eyes, flush thor-
oughly and immediately with water and seek medi-
cal attention; and
• Spilled electrolyte is to be washed down with an
acid neutralizing agent. A common practice is to
use a solution of 1 pound (500 grams) bicarbonate
of soda to 1 gallon (4 liters) of water. The bicar-
bonate of soda solution is to be added until the
evidence of reaction (foaming) has ceased. The
resulting liquid is to be flushed with water and the
area dried.
Lead-acid batteries present a risk of fire
because they generate hydrogen gas. The
following procedures are to be followed:
• DO NOT SMOKE when near the battery;
• DO NOT cause flame or spark in battery area; and
• Discharge static electricity from body before
touching the battery by first touching a grounded
metal surface.
Be sure the AUTO/OFF/MANUAL switch is set to
the OFF position before connecting the battery
cables. If the switch is set to AUTO or MANUAL,
the generator can crank and start as soon as
the battery cables are connected.
Be sure the utility power supply is turned off
and the 7.5A fuse is removed from the generator
control panel, or sparking may occur at the bat-
tery posts as the cables are attached and cause
an explosion.
4.7
ADJUSTING GH-410/GT-530/
990/999 VALVE CLEARANCE
After the first six (6) months of operation, check the valve clear-
ance in the engine, adjust if necessary.
Important: If feeling uncomfortable about doing this procedure
or the proper tools are not available, please contact the Dealer for
service assistance. This is a very important step to ensure longest
life for the engine.
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