Wallenstein BXTR5224, Operator'S Manual

Page: 54 / 68

Service and Maintenance
BXTR5224
Trailer Wood Chipper
54
6.16 Ledger Knife – Checking
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.
00154
Fig. 68 –
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.
6.16.1 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.
NOTE:
The actual clearance between the rotor blades
and the ledger knife is 1/32"–1/16" (.76–
1.52 mm).
Checking
1. Open the upper rotor housing.
CAUTION!
Risk of getting hands pinched or wedged
between lower rotor housing and rotor. Turn
rotor slowly and be aware of hand positioning.
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.
00153
Fig. 69 –
Checking ledger knife clearance
4. Turn the rotor past the ledger knife with the gauge inserted
between them to check clearance. The gauge should be
tight. Check all four knives.
Adjusting
5. Loosen the jam nuts on the outside of the ledger knife
support.