Snowmobile Yamaha Phazer PZ50 (2007-2008 year). Instruction - part 29

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SECONDARY SHEAVE

Order

Job name/Part name

Q’ty

Remarks

Secondary sheave disassembly

Remove the parts in the order listed below.

1 Circlip

1

2 Washer

1

3 Spring 

seat

1

4 Secondary 

sheave 

spring

1

5 Sliding 

sheave

1

6 Washer

2

7 Fixed 

sheave

1

8 Bushing

1

For assembly, reverse the disassembly pro-
cedure.

1

2

3

4

8

7

5

6

7 Nm (0.7 m 

•

 kg, 5.1 ft 

•

 lb)

È:   

È

: 1 ESSO beacon 325 grease

or Aeroshell grease #7A

New

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DISASSEMBLY

WARNING

• Use extreme CAUTION when disassembling

the secondary sheave since serious injury
can occur due to the sudden release of spring
tension. Use the sheave compressor to con-
tain the spring tension before removing the
spring seat circlip.

• Do not attempt this procedure unless you

have the proper tools and understand the
instructions thoroughly.

INSPECTION

1. Inspect:

• Sliding sheave
• Fixed sheave
• Spring seat

Cracks/damage 

→ Replace.

2. Inspect:

• Bushing 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 (standard) free

length 

a 

Below specification 

→ Replace the secondary

sheave spring.

Secondary sheave spring (standard) 
free length:

85 mm (3.35 in)

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5. Measure:

• Ramp shoe thickness 

a 

Out of specification 

→ Replace the ramp

shoe.

Wear limit:

1.0 mm (0.04 in)

ASSEMBLY

1. Install:

• Secondary sheave spring 

1 

• Spring seat 2 

NOTE:

Hook the end of the secondary sheave spring into
the spring holes in the sliding sheave. Hook the
other end of the spring into the holes in the spring
seat.

Standard spring position:

A-1 (PZ50/PZ50GT/PZ50FX/PZ50VT/PZ50MP)
B-1 (PZ50M)

Installation steps:

CAUTION:

• Always use a new circlip.
• Turn in the screw for the sheave compressor

so that the spring seat splines engage with
the fixed sheave splines.

• Hold the spring seat 1 and turn the sliding

sheave  2 counterclockwise to the specified
twist angle 

a.

• Push down on the spring seat until the bolts

come through the holes.

• While pushing down on the spring seat, install

the washer and circlip.

Twist angle:

45° (PZ50/PZ50GT/PZ50FX)
55° (PZ50M)
50° (PZ50VT/PZ50MP)

1

2

a

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INSTALLATION

1. Lubricate:

• Splines (fixed sheave)

2. Tighten:

• Secondary sheave bolt

3. Adjust:

• Sheave offset
• Secondary sheave free play (clearance)

Refer to “SHEAVE OFFSET ADJUSTMENT”
in CHAPTER 2.

Recommended grease:

ESSO beacon 325 grease or 
Aeroshell grease #7A

T

 

R

.

.

Secondary sheave bolt:

60 Nm (6.0 m · kg, 43 ft · lb)