Disc Speed; Ground Speed - MacDon R85 Operator's Manual

6.10.8 Disc Speed

The disc header can be used to cut a variety of
crops and for the best cutting results, a range of
disc speeds is recommended for each type of
crop and condition. See table below.
CROP
Alfalfa
Sudan, Sorghum,
Haygrazer, Timothy
Short Grass
Disc speeds are set and adjusted from the cab
using without shutting down the windrower.
Refer to your MacDon Self-Propelled Windrower
Operator's Manual.
1.6 3.2 4.8
35
30
25
20
15
10
5
0
1
Form # 169455
OPERATION
CONDITION DISC RPM
Heavy 2300-2500
Light 1600-2000
Tall & Stemmy
2300-2500
Dense 2500
Thin 1800-2000
kilometers/hour
6.4 8.0 9.7 11.3 12.9 14.5 16.1 17.7 19.3 20.9 22.5 24.1 25.7
2 3 4 5 6
6.10.9

Ground Speed

Reduce speed when turning, crossing
slopes, or when travelling over rough
ground.
a. Choose a ground speed that allows the cutterbar
and conditioner to cut the crop smoothly and
evenly.
speed and ground speed to suit your specific
crop.
Windrower Operator's Manual for changing
ground speed.
b. In tough cutting conditions, such as native
grasses, the disc speed will need to be
increased.
c. In light crops the header speed can be reduced
while maintaining ground speed.
Operating the header at the minimum disc
speed will extend the wear life of cutting
components.
d. The chart below indicates the relationship
between ground speed and area cut for two
header sizes.
Example: At ground speed of 13 mph (21 km/h), the
area cut would be approximately 20 acres (8
hectares) per hour.
7 8 9 10 11 12 13 14 15 16
miles/hour
35
CAUTION
Try different combinations of header
Refer to your MacDon Self-Propelled
NOTE
14
12
10
8
6
4
2
0
Revision A