Toro Greensmaster Flex 21, Service Manual, Page: 57 / 150

Greensmaster Flex 21 Traction and Reel Drive System (Rev. C) Page 4 – 29
11. Slide gearbox assembly to the right side of mower,
away from the engine. This should allow the left gearbox
axle to clear the frame and the gearbox to separate from
the engine gear. Rotate and angle gearbox assembly
and slide right side axle from frame to complete gearbox
removal.
12.Slide bearings and bearing flangettes from axle
shafts.
13.Remove and discard flange gasket from between
engine and gearbox.
Gearbox Installation
1. Park traction unit on a level surface. Make sure en-
gine is OFF. Remove high tension lead from the spark
plug.
2. Place new flange gasket on four setscrews installed
in engine mounting flange.
3. Slide bearings and bearing flangettes on gearbox
axles. Make sure that extended race of bearings is posi-
tioned toward outside of mower.
4. Insert gearbox short axle through frame on right side
of mower. By rotating the gearbox, position left axle into
frame and input flange of gearbox onto engine.
5. Install parking brake lever (with cable attached) to
brake shaft of gearbox noting location of alignment
splines on shaft and lever.
6. Rotate engine crankshaft slowly with recoil starter to
align crankshaft gear with gearbox input gear. Align
gearbox flange onto setscrews. Install and tighten four
flange nuts that secure gearbox to engine (Fig 39).
7. Secure extended race bearings and bearing flan-
gettes to frame with carriage bolts, flat washers and
flange nuts.
8. Check bearing alignment by rotating the long differ-
ential drive shaft. Shaft should rotate easily if alignment
is correct.
9. Tighten the bearing set screws to secure the bear-
ings to the gearbox axles. Torque set screws from 40 to
50 in–lb (4.5 to 5.7 N–m).
10.Apply anti–seize lubricant to bores of traction drive
pulleys. Install woodruff keys and place traction drive
pulleys onto gearbox axles (Fig. 38). Secure pulleys to
axles with pulley washers and flange nuts. Torque
flange nuts from 40 to 50 ft–lb (54 to 68 N–m).
11. Install traction belts, properly tension belts, and
install belt covers (see Traction Drive Belt Replacement
in this section).
1. Flange nut
2. Pulley washer
3. Pulley
4. Bearing flangette
5. Extended race bearing
6. Carriage bolt
7. Woodruff key
8. Gearbox axle
9. Flat washer
10. Flange nut
Figure 38
6
2
1
5
4
3
7
8
9
4
10
Anti–seize lubricant
40 to 50 ft–lb
(54 to 68 N–m)
1. Gearbox 2. Flange nut
Figure 39
1
2
12.Refill gearbox with proper amount of fluid (see
Change Gearbox Fluid in this section).
13.Install traction control and reel control cables to gear-
box (see Cable Replacement in the Service and Repairs
section of Chapter 6 – Chassis and Controls).
14.Adjust control cables (traction, reel and parking
brake) as needed (see Control Cable Adjustment in this
chapter).
15.Install transport wheels if they were attached (see
Wheels in the Service and Repairs section of Chapter 6
– Chassis and Controls).
Traction and Reel
Drive System