Woods BRUSHBULL BB48XE Manuel D'utilisation page 18

GEARBOX REPAIR (Figure 18)
NOTE: Repair to this gearbox is limited to replacing bearings, seals, and gas-
kets. Replacing gears, shafts, and a housing is not cost effective. Purchasing a
complete gearbox is more economical.
Remove Gearbox from Cutter
1.
Disconnect and remove the rear driveline from the gearbox.
2.
Remove vent plug (27) 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 19).
4.
Remove the four bolts that attach gearbox to cutter and remove gearbox.
Disassemble Gearbox
1.
Remove 3/8" (9.53 mm) plug from side of gearbox and pour out gear oil.
2.
Remove oil cap (23) (to be replaced).
3.
Remove snap ring (12) and shim (15) from input shaft (3).
4.
Support gearbox in hand press and push on input shaft (3) to remove
bearing (9) and spacer (14).
5.
Remove top cover (25) from housing. Remove gear (1) from inside
housing.
6.
Remove oil seal (22) from front of housing (to be replaced).
7.
Remove snap ring (12) and shim (15) from front of housing (2).
8.
Remove input bearing (8) by using a punch and hammer from outside of
housing.
9.
Support housing in vise in a horizontal position.
10.
The castle nut (17), cotter pin (28), washer (18), and hub (24) are already
removed with the stump jumper/crossbar. Remove the snap ring (10),
washer (19), and seal (21).
11.
Remove cotter pin (11), castle nut (16), and washer (20) 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 (15) from inside housing.
14.
Remove bearing (7) 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.
Reassemble Gearbox
1.
Clean housing, paying specific attention to areas where gaskets will be
installed.
18 Dealer Service
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 & 7) in the housing, using a round tube of the
correct diameter and a hand press.
4.
Slide output shaft (4) through both bearings (6 & 7) until it rests against
bearing (6).
5.
Slide shim (15) over output shaft (4).
6.
Press gear (5) onto output shaft (4) and secure with washer (20), castle
nut (16), and cotter pin (11).
7.
Apply grease to lower seal lips (21) and press seal (21) 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. Insert protective washer (19)
by hand. Install snap ring (10) and position it together with dual lip seal
(21) by pressing it into position. Verify that snap ring is seated correctly.
8.
Press bearing (8) into the housing, using a round tube of the correct
diameter and a hand press. Secure with shim (15) and snap ring (12).
9.
Secure snap ring (13) 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 (8). Align splines on shaft (3) and gear (1).
12.
Slide spacer (14) over input shaft (3) and press bearing onto input shaft
(3), using a round tube of the correct diameter and a hand press.
13.
Slide shim (15) over input shaft (3) and secure with snap ring (12).
14.
Check input shaft end float by moving the input shaft (3) by hand. If end
float is higher than .305 mm (0.012"), insert shim between input shaft (3)
and rear bearing (8). Repeat until end float is less than .305 mm (0.012").
Check rotational torque by hand. The torque should be less than .749 N-
m (2.2 lbs-inch).
15.
Check that the gear backlash is between .152 and .406 mm (0.006 and
0.016"). You should not have to adjust the backlash.
16.
Press in input oil seal (22), using tube of correct diameter. Be careful not
to damage seal lip.
17.
Press oil cap (23) on to cover the rear of housing, using a tube of the
correct diameter.
18.
Check gearbox housing for leaks by plugging all holes except one. Apply
27.6 kPa (4 psi) compressed air and immerse the gearbox in water to
verify that there are no leaks.
19.
Remove gearbox from water and dry off with compressed air. Add SAE
80W or 90W EP oil until it runs out of side level hole. Tighten all plugs.
Reinstall Gearbox
NOTE:
Gearbox is heavy; do not attempt to move without mechanical
assistance.
1.
Set gearbox on cutter and fasten with bolts and nuts. Torque bolts as
follows:
BB48XE, BB60XE, BB72XE . . . . . . . . . . . . . . . . . . 237 N-m (175 lbs-ft)
BB84XE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407 N-m (300 lbs-ft)
2.
Attach crossbar (See Crossbar Installation, page 20).
MAN1254 (3/16/2018)