Ariens 939002 ST520 - Manual (Page 18)

GB - 18
To adjust traction clutch (Figure 19):
1. Loosen jam nut on traction clutch cable
adjustment barrel.
Turn adjustment barrel up the cable to decrease
the distance between clutch lever and handlebar.
Turn the adjustment barrel down the cable to
increase the distance between clutch lever and
handlebar.
2. Check traction clutch lever distance and repeat
adjustment steps if necessary.
3. Tighten jam nut on traction cable adjustment
barrel.
ATTACHMENT DRIVE BELT
REPLACEMENT
Remove Attachment Drive Belt
(Figures 20 and 21)
1. Shut off engine, remove key, disconnect spark
plug wire and allow unit to cool completely.
2. Remove two screws securing belt cover to unit
and remove belt cover.
3. Remove belt fingers by removing cap screws
mounting belt fingers to engine (Figure 21).
IMPORTANT: To avoid bending bottom cover, remove
the cover before separating the blower housing from
the unit.
4. Support Sno-Thro frame and housing.
5. Remove top two cap screws and loosen lower
two cap screws holding blower housing to frame
(one on each side).
6. Remove attachment drive belt from engine
sheave (it may be necessary to turn engine
sheave using recoil starter handle).
7. Separate housing from unit. Lower handlebar on
floor.
8. Remove attachment drive belt from lower pulley.
Replace Attachment Drive Belt
1. Place new belt onto lower pulley and while
holding brake out of way, tip unit together.
NOTE: Engage attachment clutch lever while
connecting housing to frame to hold brake out of the
way.
2. Secure blower housing to frame with cap screws
removed in step 5 of Remove Attachment Drive
Belt on page 18.
3. Place belt onto engine sheave.
4. Replace belt fingers.
IMPORTANT: BELT FINGERS MUST BE SET as
shown in Figure 22. Improper adjustment may cause
impeller to rotate while attachment clutch is
disengaged.
5. Adjust clutch per Attachment Clutch/Brake
Adjustment on page 16.
6. Replace belt cover and secure with cap screws.
7. Run-in the drive belt according to instructions in
Run-in Attachment Belt on page 8 and the check
attachment drive clutch adjustment. See
Attachment Clutch/Brake Adjustment on page 16.
CAUTION: Always support Sno-Thro frame
and housing when loosening the cap screws
holding them together. Never loosen cap
screws while unit is in service position.
Figure 19
1. Traction Clutch
Cable
2. Jam Nut
3. Adjustment Barrel
1
3
2
Figure 20
1. Discharge Chute
Handle
2. Belt Cover
3. Bottom Cover
4. Belt Cover Screw
5. Housing Bolt Holes
OS7240
1
2
3
4
5