25
Torque Taper Lock Assembly
After first 10 hours of operation torque set screws securing
taper lock bushings to driven pulleys to 37 ft. lbs.
(50 N
⋅
m) (2 each pulley) (Fig. 29).
1
2
Figure 29
1. Bushing set screws
2. Bolt (M12)
Every 50 hours of operation, perform the following
maintenance procedure to ensure proper bearing clamp
load. Failure to perform this maintenance procedure can
lead to premature failure of crank shaft assembly resulting
in an extensive repair.
Note:
An upgraded crank assembly is available after
January 1, 2005 that does not require this maintenance
procedure. See your Toro distributor for further
information.
1.
Remove belt tension from crank assembly.
2.
Position stomper arm on pulley side of crank assembly
at bottom dead center.
3.
Remove M12 bolt securing the taper lock assembly to
the opposing crank arm (Fig. 29)
4.
Remove taper lock bushing set screws from bushing.
Install set screws in the removal holes and tighten until
taper lock bushing is free from pulley. Remove
setscrews from removal holes.
5.
Use the ”thick” assembly washer located in the frame
under the bolt that holds the manual tube and torque
the M12 bolt to 59–73 ft–lbs (80–100 Nm).
6.
Install setscrews in taper lock bushing and secure.
Torque setscrews in an alternating method to 37 ft–lbs
(50 Nm).
7.
Remove M12 bolt and replace the assembly washer
with original ”thin” washer. Re–torque M12 bolt to
59–73 ft–lbs (80–100 Nm).
8.
Re–install belt tension.
Torque Jackshaft Set Screws
After first 10 hours of operation and every 50 hours
thereafter, torque set screws securing drive shafts to gear
box shafts to 20–25 ft. lbs. (26–32 N
⋅
m) (4 each side)
(Fig. 30).
1
1
Figure 30
1. Drive shaft set screws
Adjusting Belt Tension
Make sure belts are properly tensioned to ensure correct
operation of unit and unnecessary wear.
1.
Proper belt tension is attained by compressing idler
spring to a length of 3 inches (76 mm).
2.
To adjust belt tension, proceed as follows:
A. Loosen jam nut securing idler tube to tensioner arm
(Fig. 31).
