Wallenstein BXT4224 Operator's Manual page 57

BXT Series
Wood Chipper
Figure 33 – Install a ledger knife
9.11.2 Sharpen a Ledger Knife
IMPORTANT! If the ledger knife gets hot during sharpening,
stop and wait for the ledger knife to cool.
1. Remove the ledger knife from the machine.
For instructions, see Replace a Ledger Knife on page 56.
2. Clean the ledger knife.
3. Examine the ledger knife for damage. If a ledger knife is
damaged, replace the ledger knife.
4. Put the ledger knife in a bench vice with the cutting edge
facing up.
Make sure that the ledger knife is clamped safely in the
bench vice.
5. Use a grinder to sharpen the cutting edge of the ledger knife
to a 90-degree angle. See Figure 34.
6. Do steps 4 and 5 for the opposite cutting edge.
90°
90°
Figure 34 – Sharpen a ledger knife
9.11.3 Set the Ledger Knife Clearance
1. Stop the engine. Wait for the rotor to stop turning.
For instructions, see Stop the Machine on page 32.
2. Remove the fastener and open the upper rotor housing.
3. Turn the rotor to align a rotor knife with the ledger knife.
Select the rotor knife that has the least space between the
rotor knife and the ledger knife.
4. Loosen the ledger knife fasteners.
5. Do one of the following:
• Insert a ledger knife clearance gauge between the rotor
knife and the ledger knife.
Move the ledger knife to set the position. Move the
ledger knife until the ledger knife touches the ledger
knife clearance gauge.
• Move the ledger knife to set the position. Move the
ledger knife to set the clearance between 1/32" and
1/16" (1 mm to 1.5 mm).
6. Tighten the ledger knife fasteners.
7. Use a calibrated torque wrench to torque the fasteners to
45 lbf•ft (63 N•m).
8. Do one of the following:
• If you are using a ledger knife clearance gauge, remove
it and then put it in the holder.
• If you are not using a ledger knife clearance gauge,
continue with step 9.
9. Close the upper rotor housing and install the fastener.
10. Use a calibrated torque wrench to torque the fastener to
80 lbf•ft (110 N•m).
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Service and Maintenance