39
4. Remove clamps securing fuel filter to fuel lines.
5. Install new fuel filter to fuel lines with clamps
previously removed. Filter to be mounted so arrow
points toward carburetor.
Removing Debris From Engine
To ensure proper cooling, make sure the grass screen,
cooling fins and other external surfaces of the engine are
kept clean at all times.
Every 100 hours of operation (more often under extremely
dusty, dirty conditions) remove the blower housing and
other cooling shrouds and clean the cooling fins and
external surfaces as necessary. Make sure cooling shrouds
are reinstalled.
Note: Operating the engine with a blocked grass screen,
dirty or plugged cooling fins or cooling shrouds removed,
will cause engine damage due to overheating.
Adjusting Belt
Check condition and tension of pump drive belt after first
day of operation and every 200 operating hours thereafter.
Raise bed and position safety support on extended lift
cylinder to hold up bed.
1. Check tension by depressing belt at mid span of
crankshaft and pump pulleys with 22 lbs. of force. A
new belt should deflect .48–.58 in. A used belt should
deflect .55–.65 in. If deflection is incorrect, proceed to
next step. If correct, continue operation.
1
Figure 36
1. Pump belt
2. To adjust belt tension:
• Loosen nuts securing hydraulic pump to engine
frame.
• Rotate pump until desired belt tension is attained.
Tighten nuts.
Adjusting Choke
1. Raise bed and place safety support on extended lift
cylinder to hold up bed. Stop engine and engage
parking brake.
2. Loosen cable clamp screw securing cable to engine.
3. Push choke knob in to OFF position.
4. Push choke cable firmly toward operators side of
vehicle and tighten cable clamp screw.
Replacing Spark Plugs
Replace spark plugs after every 800 operating hours to
assure proper engine performance and reduce exhaust
emission level.
Correct spark plug to use is a Champion RC 12YC or
equivalent.
Recommended air gap is .040”.
Note: The spark plug usually lasts a long time; however,
the plug should be removed and checked whenever the
engine malfunctions.
1. Clean area around spark plugs so foreign matter cannot
fall into cylinder when spark plug is removed.
2. Pull spark plug wires off spark plugs and remove plugs
from cylinder head.
3. Check condition of side electrode, center electrode, and
center electrode insulator to assure there is no damage.
.040”
Figure 37
Important A cracked, fouled, dirty or otherwise
malfunctioning spark plug must be replaced. Do not sand
blast, scrape, or clean electrodes by using a wire brush
because grit may eventually release from the plug and fall
into the cylinder. The result is usually a damaged engine.
4. Set air gap between center and side of electrodes at
.040”. Install correctly gapped spark plug and tighten
plug to 18–22 ft–lb. If torque wrench is not used,
tighten plug firmly.
5. Install spark plug wires.
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