7
-
12
7.14 Grabroll Speed
1.
Shift to park, disengage the PTO, lower the machine to the ground, relieve hydraulic pressure,
stop the engine, remove the ignition key, and wait for all moving parts to stop before dis-
mounting.
2.
Open the access door.
3.
Remove the grabroll bed drive belt according section 7.11.2
for the front drive belt or section 7.19.2 for the rear drive
belt.
4.
Remove the sheave (A), shown in Figures 7
-
25 and 7
-
26, by
first removing sheave bolts.
5.
Install the sheave bolts in the previously unused holes in
the taper lock hub. Evenly tighten bolts until the sheave is
loose.
6.
Remove the taper lock hub, key, and sheave from the shaft.
7.
Replace the drive sheave to obtain the desired
grabroll bed speed. Refer to Table 7
-
2 for grabroll
RPMs and part numbers.
8.
Place the sheave on the shaft.
IMPORTANT:
Ensure tapered surfaces are clean and
free of all lubricants.
9.
Place the taper lock hub on the shaft and then insert the
key into the shaft and hub.
10.
Start the bolts through the taper lock hub into
the sheave.
11.
Align sheave (A) with the other sheaves and
tighten evenly. Be sure the sheaves are aligned
with each other after tightening.
12.
Reinstall the grabroll bed drive belt.
13.
Close the access door before starting the machine.
NOTE:
Grabrolls turn at 552 RPM from the factory unless ordered otherwise. A larger shaft sheave
is available to speed the rolls to 606 RPM if mud collects on the grabrolls in muddy conditions. A
smaller drive sheave is available to slow down the grabrolls to 500 RPM during dry conditions to re-
duce crop damage. See Table 7
-
2 for sheave dimensions and part numbers.
A
Figure 7
-
26: Rear Grabroll Speed Adjustment
Figure 7
-
25: Front Grabroll Speed Adjustment
A
Sheave A Ouside Diameter Roll RPM
P/N
6.8*
7.15 in 182 mm
606
56647
6.2
6.55 in 166 mm
552
56646
5.6*
5.95 in 151 mm
500
53668
* Available from your authorized WIC dealer
Table 7
-
2: Grabroll Sheaves
*Available from your authorized Amity dealer
Summary of Contents for 2720
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