Wallenstein BXT4224 Operator's Manual page 54

Service and Maintenance
9.9.5 Align the Rotor Sheave
The rotor sheave can become loose on the shaft and cause
drive-belt misalignment.
The numbers in brackets refer to Figure 30.
1. Remove the set screw (1) from the sheave (6).
Put the set screw aside. It is necessary for assembly.
2. Remove the sheave bolts (5).
3. Thread the sheave bolts into the puller holes (4) on the
sheave hub (2).
4. In an even pattern, turn each of the bolts clockwise in 1/4
turn increments.
5. Do step 4 until there is space between the sheave hub and
the sheave, and they can move on the shaft.
6. Lightly tap the sheave hub with a small rubber mallet to
move it on the shaft and align the drive belt.
7. Check the drive belt alignment.
For instructions, see Align the Drive Belt on page 52.
8. Do one of the following:
• If the belt alignment is correct, continue with step 9.
• If the belt alignment is not correct, do steps 6 through
8.
9. Remove the sheave bolts from the puller holes.
Turn them counterclockwise in 1/4 turn increments.
10. Install the sheave bolts in the sheave hub.
11. Do step 4 until the sheave bolts are tight.
12. Insert, and then tighten the set screw (1).
13. Do step 6 again.
14. Do one of the following:
• If the belt alignment is correct, continue with step 15.
• If the belt alignment is not correct, do steps 1 through
14.
15. Use a calibrated torque wrench to torque the three sheave
bolts to 19 lbf•ft (25 N•m).
16. Check the drive belt tension.
For instructions, see Set the Drive Belt Tension on page
52.
1
2
3
4
5
6
Figure 30 – Rotor sheave
1. Set screw
2. Sheave hub
3. Shaft key
54
BXT Series
Wood Chipper
02184
4. Puller holes
5. Sheave bolts
6. Sheave