Évaluations - 4, GPA: 3.5 ( )

Fabricant : MTD Taille : 13.65 mb Nom Fichier : d473b935-3c81-4501-842b-02ff3f4458ab.pdf Langue d'enseignement:

IMPORTANT: With clutch lever engaged, belt finger on the side opposite the belt idler should be less than 1/8 in. (3 mm) from belt, but not touching the belt. Adjust belt finger as necessary. 5. Check adjustment. See Attachment Clutch/Brake Adjustment on page 30. 6. Reconnect chute crank and secure with spring clip (921011, 012, 013, 014, 015, 016, 019, 020) or hair pin (921017, 018). Reconnect chute lock cable and deflector cable (921017, 018). 7. Replace belt cover. TRACTION DRIVE BELT REPLACEMENT NOTE: Replacement will be easier with housing and frame tipped apart and bottom cover off. 1. Remove attachment drive belts (see Attachment Drive Belt Replacement on page 33). 2. To gain belt clearance, remove swing gate spacer and slide drive plate over so that finger clears stop hole in frame and can swing past it. See Figure 47. CAUTION: Always support Sno- Thro frame and blower housing when loosening the cap screws holding them together. Never loosen cap screws while unit is in service position. Figure 45 921011, 012, 013, 014, 015, 016, 019, 020 921017, 018 1. Belt Cover 2. Chute Gear Cover 3. Discharge Chute Rod 4. Chute Lock Cable 1 2 3 4 1 3 2 WARNING: AUGER / IMPELLER MUST STOP within 5 seconds when attachment clutch lever is released or unit damage or serious injury may result. Figure 46 OS7198 1. Traction Drive Belt 2. Engine Sheave 3. Attachment Drive Belts 4. Belt Finger 5. Attachment Belt Idler 6. Attachment Idler Adjustment Nut 7. Traction Belt Idler 2 1 4 3 5 6 7 GB - 35 3. Pull idler away from traction drive belt and remove belt from idler pulley, engine sheave and driven pulley (it may be necessary to turn engine pulley using recoil handle). 4. Install new traction drive belt onto driven pulley and engine sheave. 5. Swing drive plate toward friction disc until finger lines up with stop hole in frame. Slide drive plate over, inserting finger into stop hole. Reinstall drive plate spacer. NOTE: Make sure the drive plate assembly return spring remains connected to the frame and nylon bushing is in drive plate pivot hole. 6. Replace attachment drive belt (See Attachment Drive Belt Replacement on page 33). FRICTION DISC REPLACEMENT 1. Shut off engine, remove key, disconnect spark plug wire and allow unit to cool completely. 2. Place unit into service position on a level surface. 3. Remove both wheels. 4. Remove bottom cover by removing six hex bolts. 5. Disconnect pivot pin from the speed selector arm. Save the hardware for reinstallation. 6. Remove spring clip pin nearest drive sprocket from hex shaft. 7. Remove left bearing flange from frame. 8. Slide hex shaft to the left to remove pinion sprocket and friction disc assembly from hex shaft. NOTE: Be sure to save washers between bearing and sliding fork for re-assembly. 9. Remove friction disc assembly from frame. 10. Remove three screws holding friction disc to carrier bearing. 11. Remove old friction disc. Put the new friction disc in place, cup side to carrier bearing. 12. Reinstall three screws onto new friction disc and carrier bearing. Torque to 5 – 6 lbf-ft (22.2 – 26.7 N•m). 13. Insert new friction disc assembly into frame. Install washers onto carrier bearing and slide into speed selector arm. 14. Slide hex shaft through new friction disc assembly. Install pinion sprocket onto hex shaft and slide shaft into right bearing. 15. Install left bearing using hardware removed in step 7. 16. Reinstall clip pin into hex shaft. 17. Connect pivot pin to speed selector arm (see Discharge Chute on page 29). 18. Replace bottom cover. 19. Install wheels. 20. Return unit to upright position. 21. Connect spark plug wire to spark plug. 22. Adjust traction drive clutch (see Traction Drive Clutch Adjustment on page 32). Figure 47 OS7144 1. Spacer 2. Drive Plate Assembly 3. Traction Belt Idler 4. Attachment Drive Belts 5. Traction Drive Belt 6. Engine Sheave 7. Friction Disc 8. Drive Plate Finger 2 3 5 6 1 7 4 8 GB - 36 TRACK TENSION ADJUSTMENT (921014, 015, 016) Check the track tension by applying pressure on the track midway between the upper and rear track rollers. Deflection should be approximately 3/8 in. (9.6 mm). See Figure 49. If deflection is excessive, tighten the track tension. If unit pulls to the left or right when a straight path is desired adjust the track tension. If the unit is pulling to the left, tighten the left track adjuster. If the unit is pulling to the right, tighten the right track adjuster. To adjust (Figure 50): 1. Tighten the adjuster nut to tighten the track tension. Loosen the adjuster nut to reduce track tension. 2. Check that unit tracks straight with no pulling to either side. HEIGHT ADJUSTER CABLE ADJUSTMENT (921014, 015, 016) 1. Make sure that height adjustment lock finger is fully engaged (Figure 51). 2. Loosen jam nut on cable adjustment barrel. 3. Turn the adjustment barrel to remove all cable slack and bring the overtravel arm until it makes slight contact with the right end of the slot in the height adjuster lock finger....

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