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Two Stage Snowthrower Drive Systems Manual Introduction - 1 Introduction This manual will cover service to the auger and traction drive systems on small and intermediate frame 2 stage snowthrowers. Service information for Power Shift snowthrowers is contained in manual 492-0354. The models covered a...

Two Stage Snowthrower Drive Systems Manual 1 - 1 Chapter 1 — Auger Gearbox Service GENERAL INFORMATION The manual takes a systems approach. There are two versions of the auger gearbox and three versions of the traction drive system used among the various 2-stage models. For information on the auger ...

Auger Gearbox Service 1 - 2 Two Stage Snowthrower Drive Systems Manual Primary Method — Minimum Disassembly The following steps apply to all models. 1. Remove the belt cover. Loosen the belt guide on the engine crankshaft and remove the auger belt. DO NOT bend the belt guide out of the way (Figure 3...

Two Stage Snowthrower Drive Systems Manual 1 - 3 Auger Gearbox Service 5. Loosen the rear and remove the front capscrew securing the idler arm to the chassis. Figure 7 M-3331 6. Begin to pull the auger assembly out to the front. Note: The auger pulley and key have not yet been removed. However, if y...

Auger Gearbox Service 1 - 6 Two Stage Snowthrower Drive Systems Manual INSTALLATION Installation of the auger assembly into the auger housing can be done whether the auger housing and traction assemblies are connected or not. There is no significant time savings to either sequence. 1. All self-align...

Two Stage Snowthrower Drive Systems Manual 1 - 7 Auger Gearbox Service AUGER GEARBOX DISASSEMBLY / SERVICE Once the auger gearbox assembly is removed from the housing the repair process is the same for all models. The only variables are what type of lubricant is used (see the chart on Introduction p...

Auger Gearbox Service 1 - 8 Two Stage Snowthrower Drive Systems Manual 6. Clean the output shaft and slide the case halves off. Remove the seals from the case halves and discard the seals. 7. Clean and inspect the bushings in the case halves. If they are damaged or worn, press them out of the case h...

Two Stage Snowthrower Drive Systems Manual 1 - 9 Auger Gearbox Service Failure Analysis There are some misconceptions regarding these gearboxes that result in incorrectly identifying the causes of failure. The square cut ring on the impeller shaft is not really a seal. It is a wiper ring that has a ...

Auger Gearbox Service 1 - 10 Two Stage Snowthrower Drive Systems Manual 3. Insert the keys into the shaft and slide the large worm gear into place. Note: There is a large letter “R” and an arrow on one side of the gear. This gear MUST be installed such that the R and the arrow are on the right hand ...

Two Stage Snowthrower Drive Systems Manual 1 - 11 Auger Gearbox Service 7. Apply a VERY light coat of Loctite™ Blue #242 or quivalent to the outer diameter of the bearing. Loctite™ should not squeeze out when everything is tightened (Figure 33). Figure 33 2773-059 8. Some models use a gasket and som...

Two Stage Snowthrower Drive Systems Manual 2 - 1 Chapter 2 — Belts, Controls and Linkages INTRODUCTION All models use two belts. One to drive the auger and a second to drive the traction system. The auger drive uses a combination idler and brake to engage the belt for driving and to disengage the be...

Belts, Controls and Linkages 2 - 2 Two Stage Snowthrower Drive Systems Manual 7. The belt guide must be checked and adjusted. With the engine off, engage both the auger and traction controls. Adjust the belt guide so that there is approximately 1/8 inch (.3 cm) clearance between the belt guide and t...

Two Stage Snowthrower Drive Systems Manual 2 - 3 Belts, Controls and Linkages Replacing the Traction Belt — Lawn-Boy Models 28230, 28231 and Toro Models 38051, 38052, 38054, 38056, 38062, 38063, 38064, 38072, 38073 When the traction drive belt becomes worn, stretched, oil-soaked, or otherwise damage...

Two Stage Snowthrower Drive Systems Manual 2 - 5 Belts, Controls and Linkages 3. Loosen auger brake arm assembly by loosening rear screw and removing front screw (Figure 45). Figure 45 M-2678 4. Remove idler pulley spring (Figure 45). Let brake arm assembly hang free but out of the way. 5. Remove (2...

Belts, Controls and Linkages 2 - 6 Two Stage Snowthrower Drive Systems Manual 15. Reinstall (2) screws that secure auger brake arm assembly. Make sure tabs fit into holes in left side of machine (Figure 48). Figure 48 M-2678 16. While someone squeezes the auger/impeller control lever (Figure 49) aga...

Two Stage Snowthrower Drive Systems Manual 2 - 7 Belts, Controls and Linkages CONTROL AND LINKAGE ADJUSTMENT Note: Before making any control adjustments, verify that the handles are secured to the traction frame. If the handles move at all, the linkages will not maintain adjustment. Auger Control Ad...

Two Stage Snowthrower Drive Systems Manual 2 - 9 Belts, Controls and Linkages ADJUSTING TRACTION CONTROL Adjusting the Traction Control —Toro Models 38065, 38080, 38085 1. Move wheel drive control into No. 1, 1st gear. Position control lever so its front surface is 1/4 of an inch (6mm) from bottom o...

Two Stage Snowthrower Drive Systems Manual 2 - 11 Belts, Controls and Linkages ADJUSTING THE TRACTION ROD — LAWN-BOY MODELS 28230, 28231 AND TORO MODELS 38051, 38052, 38054, 38056, 38062, 38063, 38064 1. Thread the locking flange nut (flange side up) onto the bottom of the traction control rod, belo...

Belts, Controls and Linkages 2 - 12 Two Stage Snowthrower Drive Systems Manual ADJUSTING THE SPEED SELECTOR If the snowthrower is slow, the No.1 speed selection has no speed, or the speed selector does not move into the No. 3 speed selection, adjust the speed selector linkage. 1. Disconnect the wire...

Two Stage Snowthrower Drive Systems Manual 3 - 1 Chapter 3 — Traction Drive Systems INTRODUCTION All models use some variation of a friction drive. The engine drives a belt, which causes a drive plate(s) to rotate. As this belt is constantly tensioned, the belt and drive plate turn whenever the engi...

Traction Drive Systems 3 - 2 Two Stage Snowthrower Drive Systems Manual TROUBLESHOOTING THE TRACTION DRIVE — ALL MODELS Drive slipping: 1. Verify adjustment of traction drive linkage. 2. Make sure the engagement spring and idler spring are in place and undamaged. 3. Verify that the drive plate and f...

Traction Drive Systems 3 - 4 Two Stage Snowthrower Drive Systems Manual E. If the eyebolt, or traction drive hub is to be replaced, remove the snap ring on the hub (Figure 78). Figure 78 2768-040 F. The small sprocket is retained to the hex shaft with a key and set screw. G. The large sprocket just ...

Two Stage Snowthrower Drive Systems Manual 3 - 5 Traction Drive Systems Assembly 1. Slide the pillow block bearing, reverse plate (with the hub side away from the pulley), thrust washer, bearing (hub side facing the reverse plate), thrust washer, and spacer onto the drive shaft. Drive the roll pin t...

Two Stage Snowthrower Drive Systems Manual 3 - 7 Traction Drive Systems 6. Next, tension the pivot assembly. With the unit upright, use a screwdriver to stretch the traction spring and hook it into the hole provided (Figure 86). Figure 86 MVC-714 7. Slip one thrust washer on each end of the axle and...

Traction Drive Systems 3 - 8 Two Stage Snowthrower Drive Systems Manual 6. Remove 4 self-tapping screws that secure the axle bearings to the traction frame. Lift the axle and bearings out (Figure 89). Slide the bearings and thrust washers off the axle. Figure 89 2773-074 7. Disconnect the shift rod ...

Traction Drive Systems 3 - 10 Two Stage Snowthrower Drive Systems Manual ASSEMBLY — LAWN-BOY MODELS 28230, 23231 AND TORO MODELS 38051, 38052, 38054, 38056, 38062, 38063, 38064, 38072, 38073 Assembly Tips 1. Before assembling something with a new bushing, wipe the bushing with a clean shop towel. Th...

Two Stage Snowthrower Drive Systems Manual 3 - 11 Traction Drive Systems 5. Install the friction plate spring into the front frame assembly. Note some models just have a hole in the frame. Others have a tab bent outward to hook the spring into (Figure 100). Hook the lower end of the spring into the ...

Two Stage Snowthrower Drive Systems Manual 3 - 13 Traction Drive Systems 17. Install the friction wheel and sliding bracket. The friction wheel should be on your left (Figure 109). Figure 109 2773-081 The gear quadrant must be free to pivot. The first tooth on the quadrant should go into the hole in...

Traction Drive Systems 3 - 14 Two Stage Snowthrower Drive Systems Manual 21. If the lower traction rod was removed, reinstall it now. Slide the end through the traction bracket then install the spring and locknut. Turn the locknut on until the spring is compressed to approximately 2 ¼” (5.7 cm) long...

Two Stage Snowthrower Drive Systems Manual 3 - 15 Traction Drive Systems 6. To remove the intermediate shaft, loosen the retaining bolts and remove the chain. Loctite™ Red #271 is used to secure these bolts. Remove the shaft (Figure 116). Figure 116 0054-009 7. To remove the axle and friction plate ...

Two Stage Snowthrower Drive Systems Manual 3 - 17 Traction Drive Systems SUB ASSEMBLY REPAIR —TORO MODELS 38066, 38078, 38083, 38084, 38086 This section will cover the disassembly and repair of the traction shaft/friction wheel and the axle and friction plate assembly after they have been removed fr...

Traction Drive Systems 3 - 18 Two Stage Snowthrower Drive Systems Manual 6. There are 2 versions of the hub and slider. The early models use a normal thrust washer on either side of the slider. Later models use a thrust washer with an internal key that fits into a keyway cut into the shaft portion o...

Two Stage Snowthrower Drive Systems Manual 3 - 19 Traction Drive Systems Axle and Friction Plate Assembly Assemble in reverse order. The following are notes to assist you: 1. Install the snap ring into the grove in the pulley and shaft. The sharp edge of the snap ring should face the pulley. Install...