Service and Maintenance
BX52R, BX72R, BX102R
Tractor Wood Chipper
62
8.8 Ledger Knife
Observe ledger knife performance daily. Check the ledger
knife sharpness every 50 hours.
The ledger knife is bolted inside the lower rotor housing
assembly. As the rotor turns, material fed into the chipper is
sheared off at the ledger knife by the rotor blades.
When the corner of the ledger knife facing the rotor blade rounds
over, the blade can be removed and re-installed with a different
corner facing the rotor blade. Once all four corners have been
rounded, remove the knife to sharpen or replace it.
00874
Fig. 80 –
Ledger knife inside lower rotor housing
To obtain the best chipper performance, check the clearance
between the rotor blade and stationary ledger blade every 50
hours.
8.8.1 Ledger Knife Clearance
Use the ledger setting gauge to check knife clearance
. The
thickness of the gauge is the correct ledger blade clearance.
If spacing is in excess of the gauge thickness, adjust the
clearance.
The actual clearance between the rotor blades and
the ledger knife is 1/32"–1/16" (3/4–1-1/2 mm).
Checking
1.
Open the upper rotor housing.
CAUTION!
Wear heavy gloves, turn the rotor slowly, and be
aware of your hand positions. The rotor knives
are sharp and can cause cuts. Finger and hands
can become pinched or wedged between the
rotor and the rotor housing.
W032
2.
Turn the rotor by hand so that one rotor blade edge is next
to the ledger knife.
3.
Slide the end of the ledger gauge down between the rotor
blade and the ledger knife.
00875
Fig. 81 –
Inserting Gauge
