Subaru Robin EX35 - Manual (Page 69)

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Key Location
When using the belt pulley with the extended boss on both side as shown in the illustration,
put the spacer so that the key stays in the keyway portion of the crankshaft.
Belt Pulley Installation
Install the belt pulley in the no over-hang condition as shown in the illustration.
Pulley fitting onto PTO shoulder
For proper pulley fitting onto PTO shoulder, make round chamfer at pulley corner.
Sharp edge of pulley corner strikes PTO shoulder. In this improper condition, bolt will be loosened,
and PTO damaged finally.
Spacer
Proper
Key
Key should be within this portion.
Improper
Key
Correct
Pulley
Incorrect
Pulley
Crankshaft (PTO)
Crankshaft (PTO)
Large over-hang
Proper Improper
Pulley
Crankshaft (PTO)
Pulley
Crankshaft (PTO)
Round chamfer for
proper fitting
Sharp edge striking
Fig.15-2
Fig.15-3
Fig.15-4