Service and Adjustments

7.Use a screwdriver to move chain around guide bar.

8.If chain does not rotate, it is too tight. Slightly loosen bar clamp nut and loosen chain by turning the adjusting screw 1/4 turn counterclockwise. Retighten bar clamp nut.

9.If chain is too loose, it will sag below the guide bar and needs to be tightened fol- lowing above procedure.

WARNING: DO NOT operate the pruner if the chain is loose. If the pruner is op- erated with a loose chain, the chain could jump off the guide bar and result in serious in- jury.

CHECK CHAIN SHARPNESS

A sharp chain makes wood chips. A dull chain makes a sawdust powder and cuts slowly. See CHAIN SHARPENING in the SERVICE AND ADJUSTMENTS section.

BAR MAINTENANCE

If your pruner cuts to one side, has to be forced through the cut, or been run with an im- proper amount of bar lubrication it may be necessary to service your bar. A worn bar will damage your chain and make cutting difficult. After each use, ensure ON/STOP switch is in the STOP position, then clean all sawdust from the guide bar and sprocket hole.

To maintain guide bar:

SMove ON/STOP switch to the STOP posi- tion and disconnect spark plug (or discon- nect unit from power source).

S Loosen and remove bar clamp nut and chain brake. Remove bar and chain from pruner.

S Clean the oil holes and bar groove after each 5 hours of operation.

Remove Sawdust From

Guide Bar Groove

Oil Holes

S Burring of guide bar rails is a normal process of rail wear. Remove these burrs with a flat file.

SWhen rail top is uneven, use a flat file to re- store square edges and sides.

File Rail Edges

and Sides

Square

Worn Groove

Correct Groove

Replace guide bar when the groove is worn, the guide bar is bent or cracked, or when excess heating or burring of the rails occurs. If replacement is necessary, use only the guide bar specified for your pruner in the repair parts list.

LUBRICATION

Bar Oil

Fill Cap

SSee GUIDE BAR AND CHAIN OIL under the OPERATION section.

WARNING: Always stop unit and dis- connect spark plug wire (or disconnect unit from power source) before performing main- tenance, service, or adjustments except for carburetor adjustments.

CHAIN SHARPENING

WARNING: Improper chain sharpen- ing techniques and/or depth gauge mainte- nance will increase the chance of kickback which can result in serious injury.

WARNING: Wear protective gloves when handling chain. The chain is sharp and can cut you even when it is not moving.

Conditions which indicate the need for chain sharpening:

SReduction in size of wood chips. The size of the wood chip will decrease as the chain gets duller until it becomes more like a pow- der than a chip. Note that dead or rotted wood will not produce a good chip.

SSaw cuts to one side or at an angle. S Saw has to be forced through the cut.

Tools required:

S3/16 inch (4,5 mm) diameter round file and

file holder

SFlat file

SDepth gauge tool

TO SHARPEN CHAIN:

1.Move ON/STOP switch to the STOP posi- tion and disconnect spark plug (or discon- nect powerhead from power source).

2.Check chain for proper tension. Adjust chain tension if necessary. See CHECK CHAIN TENSION section.

3.Sharpen cutters.

STo sharpen the cutters, position the file holder level (90˚) so that it rests on the top edges of the cutter and depth gauge.

NOTE: The chain has both left and right hand cutters.

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