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26 Dealer Service
MAN0810 (9/24/2009)
VERTICAL SHAFT SEAL REPAIR
(SPINDLE BOX)
Refer to Figure 11.
1. Disconnect and remove the driveline from the
gearbox.
2. Remove vent plug (3) and siphon gear lube from
housing through this opening.
3. Remove crossbar (See “CROSSBAR REMOVAL”
on page 31.).
4. Remove vertical shaft seal (16). Replace with new
seal (See “. Seal Installation” on page 25.).
Vertical seal should be recessed in housing. Hori-
zontal seal should be pressed flush with outside 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 REPAIR
Refer to Figure 11.
1. Disconnect and remove the driveline from the
gearbox.
2. Remove vent plug (3) and siphon gear lube from
housing through this opening.
3. If the leak occurred at either end of horizontal shaft,
remove oil cap (24) and/or oil seal (10). Replace
with new one (refer to . Seal Installation, page 25).
4. Fill gearbox with SAE 80W or 90W gear lube until it
runs out the level plug.
SPINDLE GEARBOX REPAIR
NOTE: Replacing gears, shafts, bearings, and seals
may not be cost effective. Purchasing a complete gear-
box may be more economical.
REMOVE GEARBOX FROM CUTTER
Refer to Figure 11.
1. Disconnect and remove the driveline from the
gearbox.
2. Remove vent plug (3) and siphon gear lube from
housing through this opening.
3. Remove cotter pin, washer, and nut from vertical
shaft and remove crossbar (see CROSSBAR
REMOVAL, page 31).
4. Remove the four bolts that attach gearbox to cutter
and remove gearbox. Gearbox is heavy; do not
attempt to move without mechanical assistance.
DISASSEMBLE GEARBOX
Refer to Figure 11.
1. Remove 3/8" plug from side of gearbox and pour
out gear oil.
2. Remove oil cap (24) (to be replaced).
3. Remove snap ring (9) and shim (5) from input shaft
(11).
4. Support gearbox in hand press and push on input
shaft (11) to remove bearing (23).
5. Remove top cover (4) from housing. Remove gear
(6) from inside housing.
6. Remove oil seal (10) from front of housing (to be
replaced).
7. Remove snap ring (9) and shim (5) from front of
housing (1).
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 (21), cotter pin (8), and washer (20)
are already removed with the crossbar. Remove
the protective screen (17) and seal (16).
11. Remove cotter pin (18), castle nut (12), and
washer (25) from output shaft (19).
12. Remove output shaft (19) by using a punch and
hammer and tap on top to drive down.
13. Remove gear (13) and shim (14) from inside
housing.
14. Remove bearing (15) by using a punch and
hammer from the top, outside the housing.
15. Support housing upside down (top cover surface)
and remove bearing (15) by using a punch and
hammer from the bottom side of the housing.
16. 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.
17. Inspect vertical and horizontal shafts for grooves,
nicks, or bumps in the areas where the seals seat.
Resurface any damage with emery cloth.
18. Inspect housing and caps for cracks or other
damage.