Craftsman 247.77636 - Manual (Page 10)

Figure 
WARNING: Always stop engine, disconnect spark
plug, and ground against engine before cleaning,
lubricating or doing any kind of maintenance on your
machine.
Lubrication
1. Lubricate the chipper chute hinge a with light oil once a season.
2. Lubricate the pivot points on the chute deflector with light oil once a
season.
3. Refer to the Briggs & Stratton Owner/Operator manual packed with
your unit for engine lubrication instructions.
Engine Care
Refer to the Maintenance section of the Briggs & Stratton Owner/Op-
erator manual packed with your unit. Read and follow instructions
carefully.
1. Check
engine oil level before each use as instructed in the
separate engine manual.
2. Clean air cleaner’s precleaner every 25 hours under normal
conditions. Clean every few hours under extremely dusty condi-
tions. Replace the
air cleaner cartridge once a season. To service
the air cleaner, refer to the separate engine manual.
3. The spark plug should be cleaned and the gap reset once a
season. Refer to the separate engine manual for correct plug type
and gap specifications.
Chipper Shredder Care
Before each use, visually inspect your chipper shredder for loose (or
missing) nuts and bolts. Securely tighten (or replace) all hardware
before operating the chipper shredder.
Cleaning The Reduction Chamber
WARNING: The impeller’s shredder blade and chipper
blades are sharp. Wear leather work gloves to protect
your hands when cleaning out the reduction chamber.
If the reduction chamber becomes clogged with debris, the shredder
screen can be pivoted upward so that you can clean the surrounding
area. To do so, proceed as follows:
1. Stop engine, disconnect spark plug, and make certain the chipper
shredder has come to a complete stop.
WARNING: The muffler and surrounding area will be
hot if the engine has been running. Use caution and
protect your hands if working near the muffler.
2. a. If attached, remove debris bag. Remove the two wing knobs on
either side of the chute deflector and pivot the chute deflector
upward. See Figure 8.
b. Remove the hairpin clip from the clevis pin which extends
through the housing and shredder screen. See Figure 8.
Remove clevis pin.
c. Pivot the shredder screen upward and clean the surrounding
area by scraping away debris.
3. Confirm that the spark plug wire is disconnected and away from
spark plug. Pull on the starter rope two-to-three times to purge any
remaining debris from the reduction chamber
4. When the area is cleaned, pivot the shredder screen downward and
re-secure with the clevis pin and hairpin clip removed earlier.
5. Reattach the debris collection bag to the chute deflector, if desired.
Sharpening Or Replacing Chipper Blades
WARNING: The impeller’s chipper blades are sharp.
Wear leather work gloves to protect your hands.
1. Stop engine, disconnect spark plug, and make certain the chipper
shredder has come to a complete stop.
2. Pivot the shredder screen upward as instructed under the heading
Cleaning the Reduction Chamber.
3. a. Remove the chipper chute by removing three hex nuts and
washers which secure it to the impeller housing. See Figure 9.
• Rotate the impeller by hand until one of the two chipper blades is
visible through the impeller housing opening.
b. Remove the blade by removing the internal hex screws, lock
washers and hex nuts which secure it to the impeller.
NOTE: Use a 3/16” hex key (Allen) wrench on the outside of the blade
and a 1/2” box (or socket) wrench on the inside of the impeller. Hold
the Allen wrench stationary and rotate the box (or socket) wrench to
loosen the nut.
4. Install a replacement (or sharpened) blade (Part No. 742-0544A)
with the hardware removed earlier.
IMPORTANT: If sharpening the blade, protect hands by using gloves.
Follow the original angle of grind and make sure to remove an equal
amount from each blade.
5. To replace the other blade, rotate the impeller to expose the second
blade and repeat the steps above.
A
C
B
10
MAINTENENCE