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John Deere Combines 6620, Side Hill 6620, 7720, 8820. Hydraulic Operations and Tests - part 7

DIAL-A-MATIC HEADER HEIGHT CONTROL

11.0-12.8 VOLTS (Normal! battery voltage with engine shut off is 11.7-12.6 volts)

Test for voltage for three switch settings, with ignition switch on.

Remove screws securing instrument panel. In lower right hand corner on firewall is single pin connector on circuit box. Test for voltage with ignition switch on.

If combine has been in storage, rotate switch several times to clean contacts Clean single pin connector, otherwise replace switch

Clean 3 pin connector. Circuit breaker is secured by nuts inside circuit box.

Test for voltage at amplifier CPC connector. Feeder house must be lowered and ignition switch on

 Inspect chain on actuating switch for correct length. See operator's manual. Inspect rubber seal on switch. End of plunger must go through hole in rubber seal.

Test continuity of switch with feeder house lowered.

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