9.8 Ledger Knife Maintenance
WARNING!
Machine shown with shields removed for
illustrative purposes only. Never operate
machine with shields removed.
W001
Inspect the ledger knife for sharpness before each use.
Sharpen the ledger knife after every 50 hours of operation.
Material in the chipper is sheared off at the stationary ledger
knife when the rotor knives pass by.
The ledger knife can be turned or rotated, so that all four edges
on the long sides can be used. When the edge facing the rotor
knives becomes rounded over, remove the ledger knife, and then
install it with a different long edge facing the rotor knives.
When all four edges of the knife are rounded over, remove the
knife and sharpen it.
9.8.1 Sharpen the Ledger Knife
If the ledger knife has been sharpened on all corners and it is
no longer possible to set the correct clearance with the rotor
knives, replace the ledger knife.
1.
Sharpen both long edges of the knife at a 90° angle.
2.
Install the ledger knife and use the ledger knife clearance
gauge to set the correct clearance.
3.
Use a calibrated torque wrench to tighten the bolts to
33 lbf•ft (45 N•m)
.
01098
90°
90°
Fig. 34 –
Sharpen a ledger knife
9.8.2 Set the Ledger Knife Clearance
1.
Loosen the ledger knife bolts.
2.
Move the ledger knife forward (toward the rotor knives).
Snug the bolts by hand.
3.
Turn the rotor until one of the rotor knives is directly aligned
with the ledger knife.
4.
Use the ledger knife clearance gauge to set the clearance
between the two knives. Tap the ledger knife toward the
rotor blade.
If a ledger knife clearance gauge is not available, set the
clearance between 1/32 and 1/16" (1 to 1-1/2 mm).
5.
Use a calibrated torque wrench to tighten the bolts to
33 lbf•ft (45 N•m)
.
9.9 Chop Block Maintenance
Inspect the chop block for wear or damage before each use.
Rotate or replace the chop block after every 50 hours of
operation.
The chop block is bolted to the bottom of the rotor housing. The
purpose of the chop block is to help the shredder knives break
material into smaller pieces and turn it into mulch.
Inspect the chop block for damage, such as gouges, and bent or
missing teeth.
•
If the chop block teeth are worn on one side, turn the chop
block around and install it the opposite way.
•
If both sides of the teeth are worn or the chop block is
damaged, replace it.
01099
Fig. 35 –
Chop block in the rotor housing
BXMT3213
Trailer Chipper / Shredder
Service and Maintenance
43
