MTD 112-530A - Manual (Page 9)

CUTTING HEIGHT
The mower can be adjusted to four different cut­
ting heights. Cutting height adjustment is made
by removing and moving axie bolts to the desired
positions. Ail axle bolts must be mounted in the
same relative position to the deck. When wheels
are mounted to the deck, the bellevMIe washers
must be assembled with the cupped side towards
the deck. This is necessary to prevent the axle
bolts from loosening. When assembling the rear
wheel, bellevMIe washers are placed against the
threaded hole in the frame. See figure 13.
Beileviile
Washer
Axle Bolt
FIGURE 13.
THROTTLE
If adjustment becomes necessary, the throttle
control wire assembly can be reset as follows:
1. Loosen, but do not remove, screw securing
throttle control wire assembly at engine. See
figure 14.
2. Move throttle control lever on handle to
“CHOKE” position.
3. Move lever, to which control wire is fastened
at engine, to full open position. Retighten
screw
to secure throttle control wire
assembly.
i. t
If any adjustments are made to the
engine while the engine is running
(e.g. carburetor), disengage all
clutches and blades. Keep clear of
all moving parts and be careful of
heated surfaces and muffler.
CARBURETOR ADJUSTMENTS (See Figure 15)
Minor carburetor adjustment may be required to
compensate for differences in fuel, temperature,
altitude and load.
Initial Adjustment:
Turn needle valve clockwise to close it. Then open
2 turns. This initial adjustment will permit the
engine to be started and warmed up before mak­
ing final adjustment.
Final Adjustment:
With engine running at normal operating speed
(approximately 3000 RPM without load), turn nee­
dle valve clockwise until engine starts to lose
speed (lean mixture). Then slowly turn needle
valve
counterclockwise past the point of
smoothest operation, until engine just begins to
run unevenly. This mixture will give best perform­
ance under load.
To check adjustment, move engine control from
SLOW to FAST speed. If engine tends to stall or
die out, it usually indicates that the mixture is
slightly lean. It may be necessary to open the nee­
dle valve slightly to provide a richer mixture. This
richer mixture may cause a slight unevenness in
idling.
FIGURE 14. FIGUREIS.