Craftsman 770-5875B, 247.796890 manual Adjustments, Maintenance, Engine Lubrication

ADJUSTMENTS

CARBURETOR ADJUSTMENT

If any adjustments are made to the engine while the engine if running {eg. car- buretor), keep clear of all moving parts Be careful of heated surfaces and muffler

Minor carburetor adjustment may be required to com- pensate for differences in fuel, temperature, altitude or toad

NOTE

A DIRTY AIR CLEANER WILL CAUSE

ENGINE TO RUN ROUGH BE CERTAIN

AIR CLEANER IS CLEAN AND ATTACH-

ED TO THE CARBURETOR BEFORE

ADJUSTING CARBURETOR DO NOT

MAKE UNNECESSARY ADJUSTMENTS

FACTORY SETTINGS ARE SATISFAC-

TORY FOR MOST APPLICATIONS AND

CONDITIONS.

Never attempt to change maximum engine speed It is pre-set at the factory and should be changed only by a qualified service technician who has the necessary equipment,

The carburetor may need re-adjusting if engine lacks

power or does not idle properly if adjustments are needed, proceed as follows.

To Adjust Carburetor:

1.Close needle valve (See figure 16) clockwise (("_ } finger tight only Forcing may cause damage_

Then open 1-!/2 turns counterclockwise (r'x)

2.Start engine and allow to warm for five minutes.

3With throttle in RUN position, close needle valve clockwise (;-_,) until engine starts to lose speed (lean mixture). Then slowly open needle valve

counterclockwise (f'_) until engine JUST BEGINS to run unevenly This mixture should be rich enough

for best performance under load. Place throttle control in IDLE position:

a_ If engine idtes, no further adjustment is necessary.

b tf engine idles too fast, turn idle speed

adiusting screw counterclockwise _(-",) until slower speed is obtained

c If engine dies, turn idle speed adjusting screw

1f4 turn clockwise ((-'_) Place throttle control in FAST position and restart engine

d Move throttle control to IDLE position If engine does not idle, repeat step c

Test the engine by operating the chipper-shredder. If engine tends to stall or die out, it dsually indicates that the mixture is slightly lean and it may be necessary to open ,f',) the needle valve slightly

to provide a richer mixture This richer mixture may cause a slight unevenness in idling.

Idle Speed

Throttle

Adjusting Screw

Stop

i

LThrottle

Needle Valve

FIGURE 16.

MAINTENANCE

Disconnect spark plug wire and ground it against the engine before performing any repairs or maintenance.

ENGINE LUBRICATION

Your four cycie engine will normally consume some oil; therefore check engine oil level regularly - approximately, every five hours of operation and before each usage Stop engine and wait several minutes before checking oil level. With engine level, the oil must be even with the oil fill (refer to figure 7) Change engine oil after the first two hours of operation, and every twenty, five hours thereafter

I_ Drain oil while engine is warm

a.Remove oil drain plug Refer to figure 7

b.Tip the chipper-shredder forward, and catch oil in a suitable container

c.When engine is drained of all oil, replace drain plug securely.

2Refif] with fresh oi! Above 32 °, use oil labeled

SAE 3OW or !0W30 Below 32 °, use oil labeled 5W20 Capacity is 1-1i4 pints Refer to "Gas and Oil FilFUp" on page 6

3.Replace oil fill plug