214323 355 Revision A
5.6.5 Adjusting Tension on Gearbox Drive Chain
The gearbox drive chain tension is factory-set, but tension adjustments are required every 500 hours or annually
(whichever comes first). The gearbox drive chain, located inside the gearbox, requires no other regular
maintenance.
DANGER
To avoid bodily injury or death from unexpected start-up of machine, always stop engine and remove key
from ignition before leaving operator’s seat for any reason.
Figure 5.52: Chain Tensioner
1. Lower the header.
2. Stop the engine, and remove the key from the ignition.
3. Remove two bolts and chain adjusting cover (A).
Ensure there is no damage to gasket (B).
4. Remove retainer plate (C).
5. Tighten bolt (D) to 6.8 Nm (60 lbf∙in).
• For CNH / John Deere gearbox (MD #187475): Back
off bolt (D) 1-2/3 turns after tensioning.
• For Lexion/AGCO gearbox (MD #187502): Back off
bolt (D) 1/2 turn after tensioning.
6. Reinstall retainer plate (C).
7. Reinstall chain adjusting cover (A) and gasket (B).
Torque hardware to 9.5 Nm (84 lbf∙in).
MAINTENANCE AND SERVICING
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