Filter
Top Products
Dealer Service 31
MAN0826 (8/31/2010)
5. Remove vertical shaft seal (18). Replace with new
seal (see Seal Replacement, page 29).
Vertical seal should be recessed in housing. Horizontal
seal should be pressed flush with outside of housing.
NOTE: Distortion to seal cage or damage to seal lip will
cause seal to leak.
6. Fill gearbox with SAE 80W or 90W gear lube until it
runs out the level plug.
7. Assemble gearbox and pulley to gearbox stand.
Attach gearbox stand to mower deck.
Horizontal Leak Repair (Figure 17)
1. Disconnect and remove the 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 Replacement, page
29).
4. Fill gearbox with SAE 80W or 90W gear lube until it
runs out the level plug.
Gearbox Disassembly (Figure 17)
1. Remove top cover (22) from housing. Turn gearbox
upside down and pour out remaining gear oil from
gearbox.
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) and spacer (11).
5. 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) and cotter pin (25) are already
removed with the drive sheave. Remove the snap
ring (21), washer (8), and seal (18).
11. Remove cotter pin (9), castle nut (14), and washer
(8) from output shaft (4).
12. Remove output shaft (4) by using a punch and
hammer and tap on top to drive down.
13. Remove gear (5) and shim (16) from inside
housing.
14. Remove bearing (26) by using a punch and
hammer from the top, outside the housing.
15. Support housing upside down (top cover surface)
and remove bearing (6) 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.
Gearbox Reassembly (Figure 17)
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 output bearings (6 & 26) in the housing,
using a round tube of the correct diameter and a
hand press.
4. Slide output shaft (4) through both bearings (6 &
26) until it rests against 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
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.
8. Insert protective washer (8) by hand. Install snap
ring (21) and position it together with dual lip seal
(18) by pressing it into position. Verify that snap
ring 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.