MacDon PW7 Pick-Up Header - Manual (Page 39)

SECTION 4 - ADJUSTMENTS
Form 169149 Revision E 33
LOCK NUT
CHAIN
TENSION
BOLT
P00525
4.11 HEADER DRIVE CHAIN
ADJUSTMENT
DANGER : Lower header to the
ground or engage feeder house
locks, shut off combine, remove
ignition key, and wait for parts to stop
moving before performing this adjustment
NOTE: Check and adjust chain tension
after the first 3 hours of operation, and at
regular intervals thereafter.
Check header drive chain tension with a flat
screwdriver using the access hole on the left
side shield. See picture following.
Checking Chain Tension
The drive chain must be adjusted to give 1/2
inch to 3/4-inch deflection at the bottom with
approximately 10 lb (5kg) of force applied.
Drive Chain Deflection
Adjustment Procedure:
NOTE: It is not necessary to remove the side
panel for chain tension adjustment.
a) Loosen the 4 drive shaft bracket bolts only
enough to allow the bracket to slide in slots.
ATTENTION : Attempting to adjust chain
tension without loosening all 4 drive shaft
bracket nuts will damage the chain tension
bolt bracket.
Drive Shaft Bracket Bolts
b) Loosen the locknut on the chain tension bolt.
c) To relieve the chain tension, turn the chain
tension bolt counterclockwise.
d) To tighten the chain, turn the chain tension
bolt clockwise.
D00523
P00525
P00480