Page 42
472H Potato Harvester Owner Operator’s Manual
3.22 HEX BORE SPROCKETS
The harvester comes with easy to change hex bore sprock-
ets. These hex bore sprockets drive the primary and sec-
ondary chains (See Fig. #60). The speed of these sprock-
ets can affect potato bruising by changing how much dirt
the primary and secondary belted chains carry. The chain
speed to ground speed ratio change by removing the hex
bore sprockets and replacing with the desired number of
tooth sprockets. When changing the hex bore sprockets,
follow this procedure.
1. Loosen chain tension by loosening the anchor
bolt on chain idler.
2. Loosen and remove the two nuts securing the hex bore
sprockets.
3. Slide the sprocket or sprockets off the hub to be changed.
See chart (Table #2) to determine what number of tooth
sprocket to use.
4. Replace with desired number of teeth sprocket and route
chain around sprocket.
WARNING
Place all controls in neutral or off, stop tractor engine,
set parking brake, remove ignition key, wait for all mov-
ing parts to stop, then properly block machine before
servicing, adjusting, unhooking, attaching, repairing, or
unplugging.
5. Move the chain idler to give the required chain tension
(1/4" to 1/2" sag).
6. Tighten the chain idler anchor bolt to its specified torque.
If the driver and driven sprockets are known, the ratios can
be found. Using the equation in section 3.24, the adjusted
ratio for increase or decrease in speed will specify the num-
ber of teeth to use.
Speed (in MPH) of the primary and the secondary can also
be determine by the equations on the next page.
NOTE
Chain may need links added or subtracted to acquire
the correct tension.
Table. #2
*
Shipped as standard, primary & secondary drive
Pa rt Num ber
De s c ription
0 4 11 -0 1 6 1 -1 2
SPKT R C 8 0 A 1 1 T H EX BOR E
0 4 11 -0 1 9 5 -1 2
SPKT R C 8 0 A 1 2 T H EX BOR E
0 4 11 -0 1 6 2 -1 2
SPKT R C 8 0 A 1 3 T H EX BOR E
0 4 11 -0 2 0 5 -1 2
SPKT R C 8 0 A 1 4 T H EX BOR E *
0 4 11 -0 1 6 3 -1 2
SPKT R C 8 0 A 1 5 T H EX BOR E
0 4 11 -0 1 6 4 -1 2
SPKT R C 8 0 A 1 6 T H EX BOR E
0 4 11 -0 1 6 5 -1 2
SPKT R C 8 0 A 1 7 T H EX BOR E
0 4 11 -0 1 6 6 -1 2
SPKT R C 8 0 A 1 8 T H EX BOR E
0 4 11 -0 1 6 7 -1 2
SPKT R C 8 0 A 1 9 T H EX BOR E
0 4 11 -0 1 6 8 -1 2
SPKT R C 8 0 A 2 0 T H EX BOR E
0 4 11 -0 1 6 9 -1 2
SPKT R C 8 0 A 2 1 T H EX BOR E
0 4 11 -0 1 7 0 -1 2
SPKT R C 8 0 A 2 2 T H EX BOR E
0 4 11 -0 1 7 1 -1 2
SPKT R C 8 0 A 2 4 T H EX BOR E
0 4 11 -0 1 7 2 -1 2
SPKT R C 8 0 A 2 6 T H EX BOR E
He x Bore Drive S p rocke ts
Fig. # 60
DRIVEN
SPROCKET
(SECOND AR Y
CHAIN )
SPKT RC 80 A 11T HEX BORE
SPKT RC 80 A 13T HEX BORE
SPKT RC 80 A 12T HEX BORE
0411-0162-00
0411-0195-00
0411-0161-00
PART NUMBER
DESCRIPTION
DRIVE
SPROCKET
DRIVEN
SPROCKET
(PR IMAR Y
CHAIN )
DOUBLE
DRIVE
SPROCKET
CHAIN
IDLER
HEX BORE DRIVE SPROCKETS
