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SECONDARY SHEAVE
SDN4270
SDN4280
SDN4290
SDN4300
4-11
DISASSEMBLY
WARNING
•
Use extreme CAUTION when disassembling
the secondary sheave since serious injury can
occur due to the sudden release of spring ten-
sion. Use the sheave compressor to contain the
spring tension before removing the nuts (spring
seat).
•
Do not attempt this procedure unless you have
the proper tools and understand the instruc-
tions thoroughly.
1. Remove:
•
Nuts (spring seat)
INSPECTION
1. Inspect:
•
Sliding sheave 1
•
Fixed sheave 2
•
Spring seat 3
Cracks/damage → Replace.
•
Stopper 4
Wear/damage → Replace.
2. Inspect:
•
Bushing (spring seat) 1
•
Sliding sheave (V-belt contact surface) 2
Scratches/wear/damage → Replace.
•
Sliding bushing 3
Unsymmetrical wear/damage → Replace.
3. Inspect:
•
Secondary sheave spring 1
Cracks/damage → Replace.
4. Measure:
•
Secondary sheave spring free length a
Below specification → Replace the second-
ary sheave spring.
Free length limit a:
75 mm (2.95 in)
POWR
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