28 DR
®
SELF-FEEDING CHIPPER
6. Remove the Belt from the Clutch and Sheave (Figure 44).
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. Install the new Belt onto the Sheave and Clutch.
2. Use a 1/2" Wrench to adjust the Belt Tensioner until the Belt is not
sagging but not too tight (Figure 44).
3. Check the alignment of the Clutch with the Sheave by placing a
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).
4. Check the gap from the Straightedge to the Belt near the Sheave and
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:
16.5 MODEL
a) Loosen the Flywheel Pulley Set Screws a few turns using a 1/8"
Allen Wrench (Figure 46a).
b) Move the Flywheel Pulley in or out to align the Belt with the
Straightedge.
Note: Make sure the Key stays in the Key slot of the Pulley.
c) Tighten the Set screws to secure the Pulley.
21.0 MODEL
a) Remove the Bushing Retaining Bolts with a 7/16" Wrench (Figure
46b).
Note: The Sheave Bushing has four holes. Two holes for securing the
Sheave to the Bushing (threads are in the Sheave) and two holes for separating the
Sheave from the Bushing (treads are in the Bushing).
b) Reinstall the two Bolts into the Bushing Threaded Holes next to
the two holes you just removed the Bolts from.
c) Slowly tighten the Bolts evenly and alternately (1/4 to 1/2 turn)
starting with the Bolt farthest from the Bushing Saw Slot (this acts as a Hub
puller) until the Bushing releases from the Flywheel Shaft.
d) When the Sheave is loose, remove the two Bolts and reinsert them
into the original Retaining Bolt holes by hand.
e) Using the Straightedge, align the Clutch and Sheave by moving the
Sheave Bushing in or out on the Flywheel Shaft.
Note: The Pulley will move slightly onto the Bushing when tightening the
Bolts. You may need to compensate for this movement when positioning the
Bushing on the Shaft.
f) Slowly tighten the Bushing Retaining Bolts evenly and alternately
(1/4 to 1/2 turn). The Bolts only need to be snug. Do not over tighten.
g) Recheck the alignment and adjust as needed.
Figure 46b: 21.0 Model
Flywheel
Shaft
Bushing
Retaining
Bolts
Sheave
Key
Bushing
Belt (21.0 has two)
Figure 44
Clutch Pulley
Clutch Pulley
Set Screws
Figure 46a: 16.5 Model
Flywheel
Pulley
Flywheel Shaft
Key
Belt
Straightedge
Gap
Clutch
Pulley
Sheave
Gap
Figure 45
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