Page 64
472H Potato Harvester Owner Operator’s Manual
6.3 CHAIN PATTERNS
The straight/down/down pattern creates a shallow pocket. This pattern helps prevent rollback.
Using of two down rods extends the length of the pocket. Using an up rod with the down rods create a maximum opening
between the links. This up/down/down pattern breaks the surface and makes the belted chain more aggressive in soil
removal.
A long deep pocket such as created by the straight/down/straight/up will hold a considerable amount of material. This is
commonly used in rocky areas. The use of the straight link in the pattern cuts down on soil separation and closes the
opening versus the up/down pattern.
In general, when conditions are wet, more separation between soil and potatoes is desirable. Increase the pitch in wet
conditions to reduce the soil build up on the rods. Carrying more soil acts as a cushion protecting potatoes from damage by
the steel rods.
50 mm
UP
DN
STRAIGHT
1.71
50 mm
DN
STRAIGHT
1.53
1.53
STRAIGHT/DOWN/STRAIGHT/UP
50 mm
1.53
STRAIGHT
DN
1.5
3
1.7
1
1.47
1.47
1.53
Fig. #74
