Snap-on CAT3 - page 458

The ABC’s of Selecting the Right Puller
Features and Benefits
• Spring Tensioned and Self-locking Jaws –
Spring tension design holds jaws against object being
pulled, then adjusting or locking nut is tightened,
thus clamping the puller securely.
• Interchangeability –
Different jaws can be used
with yoke, thus allowing tremendous variety within the
Williams’ line.
• Jaws –
Jaws are forged for maximum strength. Forging
is a proven process to control dimensions and provide
the basis for precise heat-treating.
• Curved Jaw Design –
This allows for a secure grip,
flush to the object being pulled.
• Reversible Jaws –
Jaws can be reversed in a simple operation (no
nuts and bolts) by pulling up on the locking plate.
• Two-jaw Positions –
This feature helps avoid stresses created from
wedging action to allow straighter pull. One set of jaws and one
yoke actually provides capabilities of
three pullers.
• Pins are Forged as Part of the Jaw –
Allows easy interchange of
jaws; no nuts or bolts that can be misplaced.
• Part Numbers on Jaws –
Numbers are stamped on
jaws for easy identification and reorder.
• Parabolic curved anvil head –
A feature on the head of the pressure
screw for occasional hammer blows to “persuade” frozen gears and
pulleys. Designed to reduce mushrooming. Easily redressed with a
hand file.
• Hex Head on Screw –
This means that the pressure screw
can be turned with a standard hex wrench or socket – no
special tools needed.
• Roller threads –
Pressure screws have rolled threads (fine [nf] on
manual, course [nc] on hydraulic), instead of cut threads, making
them stronger and more durable.
• Replaceable Centering Point –
The centering point directs
power to help prevent cocking of the puller. Also allows easy,
almost friction-free, turning of the pressure screw. Generally,
only the centering point, and not the whole screw, need replacing,
saving your customer big dollars.
• Yoke –
Yoke is forged and precisely heat-treated for
maximum strength and maximum durability.
• Slide Hammer or Pressure Screws –
Yoke is compatible
with both slide hammer or pressure screw. It is also recommended
that a lubrication compound (NEVER-SEEZ
) be used on the
pressure screws.
• Slide Hammer –
Many of our pullers can be assembled with a
longer pressure screw to use slide hammer power. This fact is
especially useful in removing blind hole bearings.
A. What Type of Puller Do I Want to Use?
What would be the Combination that Works the Best?
Determine the “Reach”and “Spread” Needed
- The
puller’s reach must equal or exceed the same distance
on the part. The puller’s spread is the width of the part.
Estimate the Puller Tonnage
- Generally, if you
already have the correct “reach and spread,” you will
usually have the proper tonnage. If in doubt, use the
next larger size.
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