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26 Dealer Service
MAN0805 (4/30/2009)
Vertical Shaft Seal Replacement (Figure 13)
1. Disconnect and remove the rear driveline from the
gearbox.
2. Remove vent plug (24) and siphon gear lube from
housing through this opening.
3. Remove crossbar (see page 30).
4. Remove protective seal (8) and vertical shaft seal
(18). Replace seal (18) with new seal.
Vertical seal should be recessed in housing. Hori-
zontal seal (19) should be pressed flush with out-
side of housing.
NOTE: Distortion to seal cage or damage to seal
lip will cause seal to leak.
5. Fill gearbox with SAE 80W or 90W gear lube until it
runs out the level plug.
6. Remove and replace any seal damaged in
installation.
Horizontal Shaft Seal Replacement (Figure 13)
1. Disconnect and remove the rear driveline from the
gearbox.
2. Remove vent plug (24) and siphon gear lube from
housing through this opening.
3. If the leak occurred at either end of horizontal shaft,
remove oil cap (20) and/or oil seal (19). Replace
with new one.
4. Fill gearbox with SAE 80W or 90W gear lube until it
runs out the level plug.
GEARBOX REPAIR
Removal from Cutter (Figure 13)
NOTE: Gearbox is heavy: do not attempt to move with-
out mechanical assistance.
1. Disconnect and remove the rear driveline from the
gearbox.
2. Remove cotter pin and nut from vertical shaft and
remove crossbar (see page 30).
3. Remove the six bolts that attach gearbox to cutter
and remove gearbox.
Disassembly (Figure 13)
1. Remove top cover (22) from gearbox and pour out
gear oil.
2. Remove oil cap (20) (to be replaced).
3. Remove snap ring (10) and shim (13) from input
shaft (3).
4. Support gearbox in hand press and push on input
shaft (3) to remove bearing (7).
5. Remove six cap screws (23) and top cover (22)
from housing. Remove gear (1) from inside
housing.
6. Remove oil seal (19) from front of housing (to be
replaced).
7. Remove snap ring (10) and shim (13) from front of
housing (2).
8. Remove input bearing (7) by using a punch and
hammer from outside of housing.
9. Support housing in vise in a horizontal position.
10. The castle nut (15), cotter pin (25), and hub are
already removed with the stump jumper/crossbar.
Remove the protective seal (8), and oil seal (18).
11. Remove cotter pin (9), castle nut (14), and shim
(17) from output shaft (4).
12. Remove output shaft (4) by using a punch and
hammer and tap on top to drive down. Remove
gear (5) and shim (16) from inside housing.
13. Remove bottom bearing (21) by using a punch and
hammer from the top, outside the housing.
14. Support housing upside down (top cover surface)
and remove bearing (6) by using a punch and
hammer from the bottom side of the housing.
15. Inspect gears for broken teeth and wear. Some
wear is normal and will show on loaded side.
Forged gear surfaces are rough when new. Check
that wear pattern is smooth.
16. Inspect vertical and horizontal shafts for grooves,
nicks, or bumps in the areas where the seals seat.
Resurface any damage with emery cloth.
17. Inspect housing and caps for cracks or other
damage.
Assembly (Figure 13)
1. Clean housing, paying specific attention to areas
where gaskets will be installed.
2. Wash housing and all components thoroughly.
Select a clean area for gearbox assembly. Replace
all seals, bearings, and gaskets. All parts must be
clean and lightly oiled before reassembling.
3. Insert both output bearings (6 & 21) in the housing,
using a round tube of the correct diameter and a
hand press.
4. Slide output shaft (4) through both bearings (6 &
21) until it rests against top bearing (6).
5. Slide shim (16) over output shaft (4).
6. Press gear (5) onto output shaft (4) and secure
with shim (17), castle nut (14), and cotter pin (9).
7. Apply grease to lower seal lips (18) and press seal
(18) over output shaft (4), using a tube of the