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30 Dealer Service
MAN0654 (Rev. 10/19/2007)
GEARBOX REPAIR
Remove Gearbox from Cutter
Refer to Figure 18.
1. Disconnect and remove the rear driveline from the
gearbox.
2. Remove breather level plug (24) and siphon gear
lube from housing through this opening.
3. Remove 9 ga. wire and nut from vertical shaft and
remove crossbar (see Crossbar Removal, page
31).
4. Remove the six bolts that attach gearbox to cutter
and remove gearbox.
Disassemble Gearbox
Refer to Figure 18.
1. Remove plug from side of 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), 9 ga. wire (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 washer
(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 (6) by using a punch and
hammer from the top, outside the housing.
14. Support housing upside down (top cover surface)
and remove second 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.
Gearbox Assembly
Refer to Figure 18.
NOTE: Repair to this gearbox is limited to replacing
bearings, seals, and gaskets. Replacing gears, shafts,
and a housing is not cost effective. Purchasing a com-
plete gearbox is more economical.
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) in the housing,
using a round tube of the correct diameter and a
hand press.
4. Slide output shaft (4) through both bearings (6)
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 washer (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
correct diameter. Be sure not to damage the seal
lip.
Press in housing so that seal is recessed. Press
protective seal (8) until seated flush with housing.
Verify that the seal (8) is seated correctly.
8. Press bearing (7) into the housing, using a round
tube of the correct diameter and a hand press.
Secure with shim (13) and snap ring (10).
9. Secure snap ring (11) on input shaft (3) if not
already secure.
10. Place gear (1) through top of housing and align
gear (1) and gear (5) so that gear teeth are a
match.
11. While holding gear (1) in place, slide input shaft (3)
through gear (1) and bearing (7). Align splines on
shaft (3) and gear (1).
12. Slide spacer (12) over input shaft (3) and press
bearing (7) onto input shaft (3), using a round tube
of the correct diameter and a hand press.