Adjusting Row Unit Drive Sprockets With Fixed Speed Drive (Forage Harvesters)
494 Corn Heads are driven from the right-hand side only and includes two 32-tooth sprockets as standard equipment.
Corn heads driven from both sides - 592, 594, 692, 693, 694, 892, 893, and 894 which include two 27-tooth and two 32-tooth sprockets set at 1:1 ration as standard equipment. 1092, 1290, 1291, and 1293 corn heads have two 19-tooth and two 23-tooth set at 1:1 ratio as standard equipment.
NOTE:
Drain oil and remove pan before changing or adjusting sprockets, see Remove/Install Oil and Pan in Service section.
For maximum operating speed, install large sprockets on drive shafts and small sprocket on driven shaft.
When changing sprocket location, secure sprockets to shafts and align sprockets for smooth operation (add or remove chain links as necessary).
Adjust tightener so chain will operate without climbing or jumping sprockets.
The following chart gives the approximate harvester travel speed that must be used with each sprocket combination.
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