Great Plains Gauge Wheel-Spindle - Manual (Page 14)

Great Plains Mfg., Inc.
14 Dual Gauge Wheel/Spindle Update
195-080M 04/10/2009
Align Sprocket and Keyless Hub
About Final Sprocket Position
Refer to Figure 22
The keyless hub assembly moves as it is tightened.
before beginning to tighten, identify which style of weld-
ment is present on your drill, and review the final target
clearances.
There are two major weldment variants present on drills
which are candidates for this update:
• Shallow Hub with Raised Inside End
Drills built before March 2009 are likely to have a
1 ⁄
4
in
(6mm) raised edge (shown as dotted line in the fig-
ure). The open end wrench supplied with the kit
may be used as a spacing gauge on this type drill.
• Shallow Hub with Flush Inside End
Drills built during and after March 2009 are likely to
have shallow weldment with an inside face that is
nearly flush with the gauge wheel assembly side
plates. An additional
3 ⁄
16
in (5mm) spacing gauge (not
included) is needed in this case. The majority of such
drills will already have keyless hubs, but these instruc-
tions still apply for a single- to dual-wheel upgrade.
The desired final clearance dimensions are shown in the
table at right.
After the keyless hub is tightened, there is provision for
adjusting the spindle position with the 2in washers in the
kit (plus any washers removed from the drill).
About Final Sprocket-to-Hub Position
Refer to Figure 23
The sprocket must be fully on the outside split cylinder of
the keyless hub. These instructions recommend that the
toothed face of the sprocket be aligned with the edge of
the hub cylinder at the nut end.
A small amount of hub cylinder may be exposed, but
revealing too much may allow the nut or inside collet to
strike a bearing seal.
61. Adjust position of sprocket on hub until
sprocket face aligns with edge of outer collet .
Figure 22
Final Sprocket Alignment
29471
flanged
side 1/32in (0.8mm) to 1/8in (3.2mm)
This gap keeps the sprocket from striking
the deep weldment during use.
sprocket
side 1/4in (6mm) minimum
This gap keeps the chain from striking the
shallow weldment or side plate during use.
f
s
15
f
s
r
r
15
Figure 23
Sprocket - Keyless Hub Alignment
29456
25 1
30
25 30
1