DR Pro 475 Safety & Operating Instructions Manual page 26

Sheave
Figure 44
Belt
Sheave
Figure 45
.062 Thick
Spacers
Key
Washer
Bolt
Pulley
Figure 46a: Pro-475
Sheave
Bushing
Retaining
Bolts
Figure 46b: Pro-XL 575
DR ®
26 SELF-FEEDING WOOD 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.
Belt
3.
Clutch
Pulley
4.
Gap
Straightedge
Pro-475
Note: You must loosen the Belt Tensioning Bolt before performing this procedure.
Gap
Note: Ensure that there is always at least two .062 Spacers installed. Never use only
.73 Thick
one. One can go on the outside of the Pulley if necessary.
Spacer
Pro XL-575
Flywheel
Note: You must loosen the Belt Tensioning Bolt before performing this procedure.
Shaft
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).
Bushing
Key
Flywheel
Shaft
Remove the Belt (one Belt for Pro-475 or two for Pro XL-575) from the
Clutch and Sheave (Figure 44).
Install the new Belt (one Belt for Pro-475 or two for Pro XL-575) onto the
Sheave and Clutch.
Adjust the Belt Tensioner until the Belt is not sagging but not too tight
(Figure 44).
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).
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:
a) Remove the Pulley Bolt and Washer (Figure 46a).
b) Remove the Pulley and Key from the Shaft (Two .062 Spacers and
one .73 Spacer is still on Shaft).
c) Add or remove .062 Spacers as needed depending on how much
you need the Pulley to move in or out (Do not remove the .73
Spacer).
d) Install the Key and Pulley.
e) Add a patch of blue Loctite to the Bolt threads and secure the
Pulley with the Bolt and Thick Washer.
a) Remove the Bushing Retaining Bolts (Figure 46b).
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.