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30 Dealer Service
MAN0571 (Rev. 6/15/2007)
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 Repair (Figure 14)
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 (refer to Seal Installation, page 29).
4. Fill gearbox with SAE 80W or 90W gear lube until it
runs out the level plug.
SPINDLE GEARBOX REPAIR (Figure 14)
NOTE: Replacing gears, shafts, bearings, and seals
may not be cost effective. Purchasing a complete
gearbox may be more economical.
Remove Gearbox From Cutter
1. Disconnect and remove flex side driveline from the
gearbox.
2. Remove cotter pin and nut from vertical shaft and
remove crossbar (see Crossbar, page 34).
3. Remove breather level plug (24) and siphon gear
lube from housing through this opening.
4. Remove the six bolts that attach gearbox to cutter
and remove gear.
Disassemble Gearbox
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), 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 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 bottom 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.
Assemble Gearbox
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 seal lip.
8. 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.
9. 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).
10. Secure snap ring (11) on input shaft (3) if not
already secure.
11. Place gear (1) through top of housing and align
gear (1) and gear (5) so that gear teeth are a
match.