MacDon 872 Combine Adapter - Manual (Page 71)

71
SHIM STORAGE
Installing Float Range Limiters for John Deere 50 Series,
Contour Master & New Holland TR Combines
Float range limiter shims must be installed on the adapter
when used with John Deere 50 Series* & Contour Master*
or New Holland TR** Model Combines to prevent damage
to retracting tine drum and/or header side drapers caused
by contact when operating at flat header angles.
* NOTE: John Deere 50 Series and Contour Master have
one float limiter shim per side factory installed.
** NOTE: On the New Holland TR, the tine drum can be
moved back toward the feeder house to reduce the number
of shims required to eliminate the contact noted above. If
this is done, check clearance to the feed chain before
operating. (See initial positioning of tine drum in the
Assembly section.)
Install float range limiter shims as follows:
1. Remove the adapter from the header with the leaf
springs unloaded (stored energy released). Follow the
procedure detailed in Steps 1 – 11 on previous two
pages.
2. Back off the float adjustment screw (B) until
hardware (A) at front of springs loosens.
3. Remove hardware (A), and raise float leg (G) away
from the leaf spring assembly.
4. Loosen coil spring by removing front bolt (C).
5. At back end, remove hardware securing top end of
float arm at (D).
6. Remove 4 ½” long bolt at (E) retaining the angle
which captures the rubber upper stops.
7. Install two or three shims (F) as desired (see note
below for details) and reassemble the upper stop
assembly using the 5 ½” long bolt at (E) in place of
the 4 ½”.
8. Reassemble top end of float arm, ensuring bushing
remains in hole in arm.
9. Reassemble coil spring and leaf springs to float leg.
10. Repeat procedure at other adapter float leg.
11. Engage float lock-out pins by installing adapter into
header or compressing leaf springs. See spring
compression procedure in Tech Manual.
NOTE:
•
Two shims provides 6 inches (150 mm) of float, but when
operating at flat header angles (less than 1” (25 mm) of
thread at both ends of mechanical center link), damage
can occur to the side drapers from contact with the
retracting tine drum supports. This will occur when the
drum is moved forward because of the dust shield on
the feeder house.
•
Three shims limits the float to 4” (100 mm) and ensures
no contact between drum supports and side drapers at
the flattest header angles.
•
If two shims are used, store the third shim between the
nut and upper stop angle as shown below.
E
F
D
A
C
G