DR 16.5 Safety & Operating Instructions Manual page 28

Clutch Pulley
Belt (21.0 has two)
Figure 44
Belt
Sheave
Figure 45
Key
Figure 46a: 16.5 Model
Sheave
Bushing
Retaining
Bolts
Figure 46b: 21.0 Model
DR
28 ® SELF-FEEDING CHIPPER
6.
Clutch Pulley
INSTALLING AND ADJUSTING THE BELT
Note: The Belt Tensioning Adjusting Nut may need to be loosened up more per the
previous instructions "Removing the Belt" to enable you to install a new Belt.
1.
2.
sagging but not too tight (Figure 44).
3.
Straightedge flat across the Sheave outer surface and position the other end of
the above (not touching) the face of the Clutch Pulley (Figure 45).
Clutch
4.
Pulley
near the Clutch. If the gap is the same then no adjustment is needed. If the gap
is not the same then adjustment is necessary, correct the alignment as follows:
Gap
16.5 MODEL
Allen Wrench (Figure 46a).
Straightedge
Straightedge.
Gap
21.0 MODEL
46b).
Sheave to the Bushing (threads are in the Sheave) and two holes for separating the
Set Screws
Sheave from the Bushing (treads are in the Bushing).
the two holes you just removed the Bolts from.
Flywheel
Pulley
starting with the Bolt farthest from the Bushing Saw Slot (this acts as a Hub
puller) until the Bushing releases from the Flywheel Shaft.
Flywheel Shaft
into the original Retaining Bolt holes by hand.
Sheave Bushing in or out on the Flywheel Shaft.
Bushing
Bolts. You may need to compensate for this movement when positioning the
Bushing on the Shaft.
Key
(1/4 to 1/2 turn). The Bolts only need to be snug. Do not over tighten.
Flywheel
Shaft
Remove the Belt from the Clutch and Sheave (Figure 44).
Install the new Belt onto the Sheave and Clutch.
Use a 1/2" Wrench to adjust the Belt Tensioner until the Belt is not
Check the alignment of the Clutch with the Sheave by placing a
Check the gap from the Straightedge to the Belt near the Sheave and
a) Loosen the Flywheel Pulley Set Screws a few turns using a 1/8"
b) Move the Flywheel Pulley in or out to align the Belt with the
Note: Make sure the Key stays in the Key slot of the Pulley.
c) Tighten the Set screws to secure the Pulley.
a) Remove the Bushing Retaining Bolts with a 7/16" Wrench (Figure
Note: The Sheave Bushing has four holes. Two holes for securing the
b) Reinstall the two Bolts into the Bushing Threaded Holes next to
c) Slowly tighten the Bolts evenly and alternately (1/4 to 1/2 turn)
d) When the Sheave is loose, remove the two Bolts and reinsert them
e) Using the Straightedge, align the Clutch and Sheave by moving the
Note: The Pulley will move slightly onto the Bushing when tightening the
f) Slowly tighten the Bushing Retaining Bolts evenly and alternately
g) Recheck the alignment and adjust as needed.