Great Plains 1007NT Assembly Instructions - Manual (Page 3)

Great Plains Mfg., Inc.
Installation Instructions 3
10/10/2008 202-582M
Exchange Gearbox Sprocket
Refer to Figure 4
11. Remove and save the snap ring:
800-141C SNAP RING EXT F/PEERLESS G.B.
on the 19T rear left hand gear sprocket . The snap
ring is re-used during this installation.
12. Remove and save 19T sprocket:
808-157C SPKT 40B19 X 36T SPLINE BORE
Store the 19T sprocket in the kit case for future pos-
sible use.
13. Select one new 12T sprocket:
808-160C SPKT 40B12 X 36T SPLINE BORE
Mount the 12T sprocket in the rear left hand posi-
tion formerly occupied by 19T sprocket . Secure
with the snap ring .
Install New Gearbox Chain
Refer to Figure 5
14. Select one new:
136-080D CHAIN RL #40 105 PITCHES
Mount this chain around the new sprocket , idlers
, and the transmission sprocket .
15. Adjust idlers to remove all but
7 ⁄
8
in (22mm) of
slack in the longest span of the chain just
mounted. Tighten bolts.
Remove Old N.G. Chain
Refer to Figure 6 and Figure 8 on page 4
16. Loosen the bolts and relax the idlers at .
17. Remove the existing 176-, 179- or 180--pitch chain:
136-168D CHAIN RL #40 176 PITCHES
136-211D CHAIN RL #40 179 PITCHES W/CON
that loops around the 24T auxiliary shaft sprocket
, forward idlers , aft idlers and the final drive
sprocket at the native Grass box. Store this chain
in the kit case for future possible use.
Figure 4
Output Sprocket Snap Ring
28389
15
21
56
15
21
21
56
56
21
15
Figure 5
Gearbox Old Chain (Top)
Gearbox New Chain (Bottom)
25160
108 pitch
105 pitch
19T
12T
U
D
B F
12
21
56
52
2
3
52
56
2 3
2
52
Figure 6
Native Grass Sprocket
25159
4
13
22
U
D
F
B
L
R
4
13
13
22 4 7
8