What Size Gear Puller Do I Need? How to Match Spread, Reach and Capacity
Measure the widest part you need to grip, then pick a puller whose maximum spread is larger than that measurement. Check that its reach is deeper than the distance from the part's edge to where the jaws will hook. Then choose a tonnage above what you expect to need, since rust and press fits add resistance.
Orion Motor Tech S00400Best overall
VEVOR YL-15THeavy-duty hydraulic pulling
VEVOR Hydraulic Gear Puller 15 TonLighter 15 ton hydraulicThe three numbers that set puller size
Puller size is not one number. It is three, and you need all of them to line up. Spread is how wide the jaws open. Reach is how far the jaws can extend down to grab behind the part. Capacity, rated in tons, is how much force the tool can apply.
Shoppers often look only at capacity. That is a common mistake. A strong puller with jaws that cannot open wide enough, or cannot reach far enough, will not work on your part at all. Start with spread and reach, then check capacity.
How to measure your part
A tape measure or calipers and a few minutes are all you need. The same steps work for a gear, a pulley, a bearing or a hub, so they also answer the jaw puller and pulley puller versions of this question.
Remember that the jaws must hook the part from the outside edge, or from the inside of a bore if you are pulling from within. Which one you pick changes the measurement.
- Measure the outside diameter of the part. This is the spread you need, and the puller's max spread must exceed it.
- Measure from the face of the part to the back edge where the jaws will hook. Add the length of shaft sticking out past the part. The puller's reach must cover this total.
- Note the shaft diameter and how far the part sits on it. Longer, tighter fits need more force.
- Check for a lip, a keyway or a nearby housing that could block a jaw. Tight spaces favor slim, three-jaw designs.
- Decide whether you will pull from the outside or the inside, because reversible jaws let you do either.
Matching spread and reach to common parts
Use the table below as a rough guide, then confirm with your own measurements. The example sizes come from the products on our best gear puller page, so you can see what real spec sheets look like.
Add some margin. If your pulley is 5.5 in across, a puller that opens to exactly 5.5 in leaves no room to seat the jaws. Aim for a spread comfortably above your measurement.
| Part size | Spread to look for | Example from our data |
|---|---|---|
| Small gear, small pulley, small bearing | Up to about 3 in | DURATECH 3-jaw: 3 in spread, 3.56 in reach |
| Small to medium pulleys and gears | About 4 in | CARVALAX 2T puller: 4 in spread, 4.5 in reach |
| Medium pulleys, crank pulleys, hubs | About 6 in | CARVALAX 5T puller: 6 in spread, 7.75 in reach |
| Larger gears and wide pulleys | About 8 in | Orion Motor Tech 8 in puller: 9.2 in reach |
| Large gears, hubs and flanges | Up to 12 in | VEVOR 15 ton models: 12 in max spread |
Picking the right capacity
Capacity is the force rating in tons. Small pulleys and loose bearings need little. Seized hubs, rusty shafts and large gears need much more. Among the models on our page that list capacity, ratings run from 3 ton to 15 ton.
Rust matters more than most people expect. A part that looks easy on paper can fight you if it has sat on a shaft for years. Pick a rating above what you expect to need, so you are not working the tool at its limit.
If the part will not move, do not just add more force. Stop and check that the jaws are seated square, the center screw is lined up with the shaft, and nothing else is holding the part in place.
Screw or hydraulic: which drive fits your job
A screw puller turns with a wrench or ratchet. It is lighter and simpler, and it suits small to medium jobs. The DURATECH 3 ton screw puller is a good example of a compact tool for small gears and pulleys.
A hydraulic puller builds force with a pump handle. It suits heavy, stuck parts and big components. The two VEVOR 15 ton hydraulic models on our list weigh 25 lb and 17 lb, so plan for a heavier tool to hold and position. If you want more detail on how these types compare, see our gear puller comparison.
Jaw count matters too. Three jaws spread force evenly and grip steadily. Two jaws can fit tighter spots and small bearings. Models with reversible two or three jaw setups, such as the CARVALAX kit, give you both options.
Safety before you pull
Pullers store a lot of force. Parts can release suddenly, and jaws can slip. Treat every pull with care.
Wear safety glasses or a face shield every time. Wear gloves, and keep your hands and face out of the line of the jaws. Never exceed the tool's rated capacity.
Do not use heat from a torch on a part near fuel lines, seals or grease without a plan for fire safety. Support heavy parts so they do not drop on your feet when they come free. Relieve hydraulic pressure slowly before you take the puller off the part.
Frequently asked questions
Can I use a bigger puller on a small part?
Often yes, as long as the jaws can still grip the part and the center screw lines up with the shaft. A very large puller can be awkward on a small part, and you may not be able to seat the jaws squarely.
Is a kit with several sizes better than one puller?
If you work on different parts, a kit saves you from owning mismatched tools. The Orion Motor Tech set has four sizes with spreads from 3 in to 8 in. A single puller makes sense when you only have one job in mind.
Do two jaws or three jaws pull better?
Three jaws spread force more evenly and grip steadier. Two jaws fit small bearings and tight spots. Pick based on how much room the part leaves around it.
What if my part is stuck even after it is set up correctly?
Stop and recheck the alignment first. A penetrating oil soak and a light tap on the screw head can help. If it still will not move, step up to a higher-capacity hydraulic tool rather than forcing a smaller one.