Section 4 - ADJUSTMENTS & REPAIR
WARNING
DO NOT attempt any maintenance, adjustments or service with engine and blade running. STOP engine and blade. Disconnect spark plug wire and secure away from spark plug. Engine and components are HOT. Avoid serious burns, allow sufficient time for all components to cool. Wear heavy leather gloves when handling or working around cutting blades. Blades are extremely sharp and can cause severe injury. DO NOT use a cutting blade that shows signs of excessive wear or damage.
4.4.1.Engine Drive Belt Replacement (Stretch Type Belts)
(Continued From Previous Page)
IMPORTANT: DO NOT tip machine with carburetor or spark plug down. Oil from crankcase will saturate the air filter and cause the engine to be hard to start or not start at all. If contamination does occur, the air filter will have to be replaced.
3.Remove the driven disc. Refer to Section “Replacing Rubber Driven Disc Ring” for driven disc
assembly removal procedure.
4.Tilt mower up on its rear wheels and remove blade and blade hub. Assistance from another
person may be necessary to hold mower in the tilted position.
5.Hold the slotted end of the drive disc bolt with a screwdriver and remove the nut and internal tooth
lock washer. See Figure 4.16.
6.Remove the belt cover located under deck.
7.Lift the drive disc up and remove worn belt.
8.Loop one end of new belt over engine pulley and insert the other end through slot in deck. See Figure
PULLEY POSITION
| DRIVE DISC | |
SLOT IN END |
| |
OF DRIVE DISC |
| |
BOLT |
| |
| BUSHING | |
DECK BRACKET |
| |
(PARTIALLY | BOLT RETAINER | |
SHOWN) | ||
| ||
| INTERNAL TOOTH | |
| LOCKWASHER |
9.Loop the belt around the pulley on the bottom of the drive disc.
10.Reinstall drive disc and retaining hardware. IMPORTANT: 1) The square shoulder of the drive disc bolt must fit into the square hole of the bushing. 2) The square end of bushing must fit into the bracket slot.
11.Reinstall belt cover and tighten bolts securely.
12.Reinstall blade hub and cutter blade. Recommended torque for blade cap screw is 30 to 40 ft. lbs.
4.4.2.Transmission Poly-V Belt Replacement
1.Remove the driven disc. Refer to Section “Replacing Driven Disc Rubber Ring” for procedure.
2.Note the routing of the old belt around the three pulleys before removing it. See Figure 4.17.
3.Place new
4.Work belt onto top of idler pulley.
5.Twist belt sideways and pull it upward between the differential bracket and drive pulley and then down into the pulley groove. Make sure the
| IDLER |
DRIVE | PULLEY |
DIFFERENTIAL | |
PULLEY | BRACKET |
| |
| BELT |
HEX SHAFT |
|
BELT GUIDE | DRIVEN |
| PULLEY |
ROUTING OF
FIGURE 4.17
NUT
FIGURE 4.16
17