MacDon 974 FlexDraper - Manual (Page 58)

Form # 147083 Issue 01/07 56
MAINTENANCE/SERVICE
REEL AND REEL DRIVE
Reel Clearance To Cutterbar
Minimum finger to guard/cutterbar clearance is as follows:
• For 973 Headers: 5/8 inch (15 mm) at both ends
of cutterbar.
• For 30’ 974 Headers: 1-3/4” (45mm) at each end
and 2-1/4” (58mm) at center.
• For 36’ 974 Headers: 1-3/4” (45mm) at left end,
1” (25mm) at right end and 2-3/8” (60mm) at
center.
NOTE: Reel clearance to cutterbar is factory set as
above. Adjustment should not normally be required.
NOTE: For 974 Flex Header, place cutterbar in full frown
position to take measurements: Lower cutterbar onto two 6”
(150 mm) blocks placed just inboard of wing flex points.
Minimum clearance will occur at the hinge areas.
Check all possible points of contact between points (X).
Depending on reel fore-aft position, minimum clearance
can occur at guard tine, hold-down or cutterbar.
Check reel clearance whenever the reel fore-aft position
or finger pitch is changed.
When operating reel with an aggressive finger pitch, be
sure that fingers will not contact sickle when flexed back
by crop, as at (R).
To adjust reel clearance to cutterbar:
1. Raise header and engage header lift cylinder stops.
Lower header onto stops. Lower the reel fully.
2. Loosen and back off nut (A).
3. Turn nut (B) clockwise to increase clearance to
cutterbar, or counter-clockwise to decrease.
4. Tighten nut (A) against nut (B) to secure the position.
5. Repeat at opposite side.
Reel "Frown" Adjustment
The reel has been factory adjusted to give more
clearance at the center of the cutterbar than at the ends.
This compensates for flexing of the reel and header over
rough ground. For 974 Flex Header, use the adjustment
to provide adequate reel clearance at dividers
The "frown" is adjusted by repositioning the hardware
connecting reel finger tube arms to reel discs.
If reel is disassembled for service, adjust positioning of
hardware in holes (C) to maintain the proper profile.
NOTE: Take these measurements with the reel centered
over the cutterbar (see "Reel Position" in Operation
section). This will provide adequate clearance at all reel
fore-aft positions.
NOTE: This adjustment can also be used to compensate
for reel tube and cutterbar tolerances.
When adjusting, start with the reel arm set closest to the
center of the header, and work your way out to the ends,
allowing the reel arms to find a natural curve, and
positioning the hardware appropriately.
NOTE: In some locations, top and bottom bolts in the
same reel arm may not be in the same hole position.
(See photo.)
A
B
REEL CLEARANCE ADJUSTMENT
CHECK CLEARANCE TO SICKLE
R
Finger to Cutterbar clearance
(974 in full frown)
REEL "FROWN" ADJUSTMENT
C
C