MacDon 4000 Mower Conditioner - Manual (Page 26)

26
OPERATION
OPERATING VARIABLES (continued)
2. REEL SPEED
For best feeding of the crop into the
conditioning rolls, reel speed should be just
faster than ground speed. This gently sweeps
material across knife into the rolls.
The reel speed is factory set at 63 rpm. See
chart below for reel speed options.
position of:
rpm tine tip speed
mph (km/h) yoke
plate (B)
shim (F)
53 6.6 (10.6) inside inside
56 7.0 (11.3) inside outside
60 7.5 (12.0) outside inside
63 7.9 (12.7) outside outside
In down and tangled crops, a faster reel speed
will result in a more even stubble height.
To change reel speed:
a. Loosen reel drive belt enough that it can be
removed from drive pulley (A) at main
gearbox. See "Reel Drive Belt" in
"Maintenance/Service" section for tension
adjustment procedure. Do not pry belt over
pulley.
b. Scratch an alignment mark on pulley half (A)
and yoke plate (B) to maintain roll timing on
re-assembly. Do not use pulley half (E) for
alignment.
c. Remove three bolts (C).
d. Collapse the driveline at the telescoping shaft
(D) and remove pulley half (E).
NOTE: Shim (F) is open one side and can be
removed once bolts are removed.
e. Re-assemble for desired reel speed,
positioning yoke plate (B) and shim (F) inside
or outside pulley halves as indicated in chart
above. Remember to align marks before
tightening bolts.
f. Replace belt and adjust belt tension.
53 RPM REEL SPEED
63 RPM REEL SPEED
REEL DRIVE PULLEY ASSEMBLY
A