Craftsman 580.751781 owner manual Service and Adjustments, Engine Speed, Adjusting Valve Clearance

SERVICE AND ADJUSTMENTS

ENGINE SPEED

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 govemor_ DO NOT try to adjust the governed speed setting for the following reasons:

oHigh 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 temperature and piston should be at Top Dead Center (TDC) of compression stroke (both valves closed). Correct clearance is 0_05-0.1mm. Adjust valve clearance as fol- lows:

°Loosen the rocker arm jam nut. Use an allen 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, hold pivot ball stud with allen wrench and tighten rocker arm jam nut with crows fool Tighten am 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 becomes restricted or clogged with foreign materials, such as dirt, excessive 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 off the water supply. o Separate the wand from the gun_

=Remove nozzle from the end of the wand using a 2mm or 5/64 allen wrench (like the one included in the kit)_

oUse the wire included in the kit (Fig. 29) or a small paper

clip to free the foreign materials clogging or restricting the nozzle.

FEELER

ALLEN

0GAUGE

7LOOSEN

JAM NUT

FIGo 27

Tighten jam nut to

65-85inch-pounds

_-10 N-m).

FIG. 28

Insert wire into nozzle and turn back and forth to clear obstruction

FIG. 29

17