Craftsman 580.751651 - Manual (Page 17)

SERVICE AND ADJUSTMENTS
ENGINE SPEED
A CAUTION: ENGINE SPEED WAS PROPERLY AD­
JUSTED AT THE FACTORY AND SHOULD RE­
QUIRE NO ADDITIONAL ADJUSTMENT. DO NOT
ATTEMPT TO CHANGE ENGINE SPEED. IF YOU
BELIEVE THE ENGINE IS RUNNING TOO FAST OR
TOO SLOW, TAKE YOUR PRESSURE WASHER TO
SEARS AUTHORIZED SERVICE CENTER FOR RE­
PAIR AND ADJUSTMENT. CHANGING ENGINE
GOVERNED SPEED WILL VOID ENGINE WAR­
RANTY.
Your pressure washer runs at a constant speed. This
constant operating speed is maintained by a mechanical,
flyweight type, fixed speed governor, DO NOT try to adjust
the governed speed setting for the following reasons:
* High engine speeds are dangerous and increase the
risk of personal Injury or damage to equipment.
Low engine speeds impose a heavy load on the engine
when sufficient engine power is not available and may
shorten engine life.
ADJUSTING VALVE CLEARANCE
After the first 50 hours of operation, you should adjust the
valve clearance in the engine.
When adjusting valve clearance, engine should be at room
>mperature and piston should be at Top Dead Center
. TDC) of compression stroke (both valves closed). Correct
learance is 0.05-0.1 mm. Adjust vaive clearance as fol-
ws:
• Loosen file rocker arm jam nut. Use an alien wrench
to turn the pivot ball stud while checking clearance
between the rocker arm and the valve stem with a feeler
gauge (Fig. 27).
• When valve clearance is correct, hoid pivot ball stud
with alien wrench and tighten rocker arm jam nut with
crows
foot. Tighten jam nut to 65-85 inch-pounds
torque. After tightening jam nut, recheck valve clear­
ance to make sure it did not change (Fig. 28).
NOZZLE MAINTENANCE
If the nozzle beojmes restricted or clogged with foreign
materials,
such as dirt, excessiw pump pressure may
develop. A partially clogged nozzle can cause a pulsing
sensation during use. This generally is not a pump related
problem, but rather a clogged or partially restricted nozzle.
If the nozzle becomes clogged or partially restricted, Imme­
diately clean the nozzle with the kit included with your
pressure washer by following these instructions:
* Shut off the engine and turn oft file water supply.
• Separate the wand from the gun.
♦ Remove nozzle from the end of the wand using a 2mm
or 5/64 alien wrench (like the one included in the kit).
Use the wire Included in the kit (Fig. 29) or a small paper
clip to free the foreign materials clogging or restricting
the nozzle.
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