Hitachi CH50EA (ST) Bedienungsanleitung Seite 10

Spark plug (Fig. 3-3)
The spark plug condition is influenced by:
An incorrect carburetor setting.
Wrong fuel mixture (too much oil in the
gasoline)
A dirty air filter.
Hard running conditions (such as cold
weather).
These factors cause deposits on the spark plug
electrodes, which may result in malfunction and
starting difficulties. If the engine is low on
power, difficult to start or runs poorly at idling
speed, always check the spark plug first. If the
spark plug is dirty, clean it and check the
electrode gap. Readjust if necessary. The
correct gap is 0.6 mm (.024"). The spark plug
should be replaced after about 100 operation
hours or earlier if the electrodes are badly
eroded.
NOTE!
In some areas, local law requires using a
resistor spark plug to suppress ignition signals.
If this machine was originally equipped with
resistor spark plug, use same type of spark
plug for replacement.
Fig. 3-3
Fig. 3-5
Cutter blade (Fig. 3-4, 4B)
The blades are installed to the cutter guide with
the four or five bolts. Those bolts are tightened
with a clearance so that the cutters can move
smoothly.
When clearance is too small:
The cutters do not move properly and the
sliding surfaces may seize.
When clearance is too large:
The cutters are poor in sharpness.
To adjust the cutter clearance:
1. Loosen the cutter fixing nuts.
2. Fully tighten the cutter fixing bolts and then
loosen them approx. 1/2 turn.
3. With the bolts set at that position, tighten the
cutter fixing nuts.
Be sure to replace cutter guide fixing bolts
when they are loosened, worn or damaged.
Also be sure to replace damaged cutter blade.
NOTE!
Properly lubricate the cutter sliding surfaces
with machine oil.
Fig. 3-4
Fig. 3-6
Gear case (Fig. 3-5)
Apply a good quality lithium based grease
through the grease fitting until a small amount
comes out between the cutter blades and the
gear case.
NOTE!
Lubrication should be applied at 50 hour
intervals and more frequently with heavy
use.
Fuel filter (Fig. 3-6)
Remove the fuel filter from the fuel tank and
thoroughly wash it in solvent. After that, push
the filter into the tank completely.
NOTE !
If the filter is hard due to dust and dirt, replace
it.
G
B
Fig. 3-4B
GB-9