Combines With Fixed-Chain-Drive Feeder House

The header drive speed is varied by changing the speed of the lower feeder house shaft (A). Lower feeder house speed is changed by using one of three drive sprockets (B) located on the lower left-hand side of the feeder house.

If necessary, add or remove links from the chain when changing drive sprocket.

Be certain to align sprockets and adjust tightener (C) to obtain proper chain tension.

On 4425 combines, the header drive chain must be in the inner position (568 rpm) for corn. The outer position (497 rpm) is for platforms.

Chain drive 4420 feeder houses have three fixed speeds of 469, 618 and 755 RPM.

IMPORTANT: On 4420 Combines, the feeder house lower shaft speed, as shown in the following charts, is determined by the primary countershaft speed which must be 1500-1510 rpm. Check primary countershaft speed before changing the feeder house lower shaft speed.

The following charts give the approximate combine ground travel speed that should be used in relationship to the number of teeth in the sprocket used.

NOTE: The speed given in the charts is only a guide to use and is based on average conditions. Your particular field condition will determine which sprocket should be used.

A-Lower Feeder House Shaft
B-Drive Sprockets
C-Tightener

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NOTE: 4420 Combines are also furnished with an 18-tooth sprocket.

The range of row-crop head operating speeds on 4420 Combines with fixed chain drive feeder house can be changed by the position of row unit drive sprockets.

The higher speed positions of these sprockets are used only when travel speeds consistently exceed 6.4 mph (4.0 km/h).

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