MacDon 873 Combine Adapter - Manual (Page 34)

Form # 147069 Issue 09/06 32
MAINTENANCE/SERVICE
RETRACTING TINE DRUM
Tine Pitch Adjustment – Tines should be fully extended
on the front side of the drum and full retracted on the rear
(feeder house) side.
Tine pitch can be adjusted to change the aggressiveness
of the tines. More aggressive tine pitch means the tines
stay extended for longer as they approach the feed chain
on the combine. Less aggressive means the tines retract
sooner.
IMPORTANT: Always maintain a minimum 3/8” (10 mm)
clearance to header and feed draper with top link fully
retracted and header floated up.
To adjust tine pitch, reposition bolts (A) in cam plate at
right side of adapter. Angling the cam plate further up at
the front decreases tine aggressiveness. Angling the cam
plate down at the front increases tine aggressiveness.
Tine Installation – Depending on deck size, some tines
may have been removed from the drum at the factory to
suit the recommended header side draper opening size.
Should header opening be widened to suit bulky crops,
install tines on outer ends of drum as required to aid
feeding. Always check clearances after adding tines, and
maintain 2” (50 mm) gap from tines to side drapers. When
adding or replacing tines, install hair-pin (C) as shown,
with head leading in direction of drum rotation and
clamping side of pin inboard. Tighten plastic guide
hardware to 75 in. lbs. (8.47 N.m).
Drum Fore-Aft Adjustment – Drum has been shipped in
the proper fore-aft range for your combine. See chart on
page 45. To adjust drum fore-aft position within this range,
loosen two mounting bolts (B) each side. Remove
mounting bolt for plastic deflector (rear bolt for 56” decks &
forward bolt for 38” & 45” decks). Loosen the second
deflector mounting bolt (both sides) and place deflector
bolt in appropriate hole as shown in chart on page 45.
Tighten all deflector hardware. In general, there should be
1 to 2 inches (25 to 50 mm) clearance between adapter
drum and combine feed drum, with combine feed drum
floated up.
NOTE: For best performance, dust shields should be
removed from combine whenever possible. If dust shields
are not removable, adapter drum should be within 1/4 to
3/4 inches (6 to 19 mm) of the dust shield.
IMPORTANT: To prevent damage to drum or feed draper,
always check drum clearance to header frame and feed
draper after adjusting header angle. Flattening the header
angle will reduce the clearance to the drum fingers.
Maintain a 3/8” (10 mm) clearance with top link fully
retracted and header floated up.
Windrowing – When laying a windrow out the end of the
header, move the drum back to clear header backsheet
when it is moved across the center opening. In some
cases it will also be necessary to remove one row of tines
from drum to provide adequate clearance.
For a complete list of steps to convert to windrowing
mode, see “End Delivery” in the Operation section of your
Header Operator’s Manual.
C
TINE INSTALLATION
NOTE: For 963, 973 and 974 Headers only, if
plugging occurs between drum and feed
draper in bulky crops, drum may be raised to
upper hole (E) in frame. Float down stop
must be in Position 2 (973/974) if making this
adjustment. See page 39. Check drum
clearance to header frame after adjusting
drum height.
TINE PITCH ADJUSTMENT
A
DRUM FORE-AFT ADJUSTMENT
B
E
B