Toro Groundsmaster 3280-D Service Manual page 237

4. Disconnect P.T.O. drive shaft from gearbox (see
P.T.O. Drive Shaft Removal in Service and Repairs sec-
tion of Chapter 9 − P.T.O. System).
5. Remove four (4) cap screws (item 17) and lock wash-
ers (item 16) that secure gearbox assembly to gearbox
brackets.
6. Remove fasteners that secure left side gearbox
bracket (item 12) to deck mounting plate. Remove
bracket from deck.
7. Remove gearbox assembly with drive pulley at-
tached from deck. Drain lubricant from gearbox.
8. Remove two (2) set screws that secure taper lock
bushing to drive pulley on gearbox shaft.
9. Thread one of the removed set screws into threaded
hole of bushing (Fig. 10). Tighten set screw to loosen
bushing from pulley hub.
10.Slide bushing and pulley from gearbox shaft. Locate
and retrieve woodruff key.
11. If necessary, remove and replace oil seals and oil
caps in gearbox (Fig. 11).
NOTE: If internal gearbox wear or damage occurs,
gearbox replacement is necessary. Internal gearbox
components are not available.
Installation (Fig. 9)
1. If oil seals or seal caps were removed, use a press
to install seals or caps so they are flush with the gearbox
housing. With seals installed, rolling torque for gearbox
input shaft should be 5 to 10 in−lb (.56 to 1.13 N−m).
2. Clean gearbox output shaft, pulley ID and taper lock
bushing thoroughly.
3. Position woodruff key, pulley and then taper lock
bushing to gearbox output shaft. Slide bushing to shoul-
der on shaft. Align threaded holes of pulley with non−
threaded holes of bushing.
4. Lightly oil threads of set screws and install screws
into threads of pulley (Fig. 10). Alternately and evenly
tighten set screws to a torque of 175 in−lb (19.8 N−m).
5. Fill allen recess in set screws and bushing threads
with grease to prevent dirt from packing into crevices.
6. Position gearbox assembly with drive pulley at-
tached to deck.
7. Position and secure left side gearbox bracket (item
12) to deck mounting plate.
8. Secure gearbox assembly to gearbox brackets with
four (4) cap screws (item 17) and lock washers (item 16).
Groundsmaster 3280−D/3320
9. Connect P.T.O. drive shaft to gearbox (see P.T.O.
Drive Shaft Installation in Service and Repairs section
of Chapter 9 − P.T.O. System).
10.Install drive belt and belt covers to cutting deck (see
Cutting Unit Operator's Manual).
11. Torque plug in gearbox to 175 in−lb (19.8 N−m). Fill
gearbox with lubricant (see Cutting Unit Operator's
Manual). Install dipstick in gearbox and torque to 175 in−
lb (19.8 N−m).
1
1. Set screw installation position
2. Set screw removal position
175 in−lb
(19.8 N−m)
6
5
1. Oil cap
2. Dipstick
3. Oil cap
Page 10 − 13
2
1
Figure 10
175 in−lb
1
(19.8 N−m)
3
4
Figure 11
4. Gearbox
5. Oil seal
6. Plug
Cutting Units
2