- Ningbo Dongning Tools Co.,Ltd
- Professional Chinese Tools manufacturer on automotive speciality tools,bearing puller&heavy truck tools
- Address
- No.6 Falan Rd,Hengjie Town,Ningbo City,Zhejiang,China
- Phone
- +86-574-87216625
- info@nbdntools.com
OEM Automotive Tools Manufacturer | Bearing Pullers & Repair Tools Supplier
How to Match Puller Jaws to the Bearing or Gear Size
Direct Answer
Match puller jaws by verifying four things before loading: the jaws can reach behind the component, their spread covers it without overextension, their contact suits the available lip or groove, and the puller capacity exceeds the expected separation force.
Measure Reach First
Reach is the usable distance from the jaw head to the pulling surface. It must equal or exceed the distance needed to get fully behind the bearing, gear, or pulley.
Confirm Available Spread
Spread is the jaw opening needed around the component. Choose a puller that covers the part without placing the jaws at their unstable outer limit.
Match the Jaw Profile to the Contact
Thin jaws can enter limited clearance, while standard or curved jaws may provide a stronger seat on a groove or bearing race. Do not force thick jaws into a narrow gap.
Choose Two or Three Jaws by Access
Three jaws normally distribute load more evenly on round parts. Two jaws can be necessary in restricted spaces but require careful centering and equal engagement.
Engage Behind a Strong Surface
The jaw tips should bear on a solid shoulder, groove, race, or attachment. Never pull on a cage, seal, tooth edge, or a surface too thin to carry the load.
Align the Forcing Screw
Place the forcing screw squarely on the shaft center or a suitable protector. An off-center screw turns a straight pull into a damaging side load.
Verify Capacity and Condition
Use a puller whose rated capacity comfortably covers the task, especially for corroded or interference-fit parts. Inspect jaws and the forcing screw before use.
Adjust Before Applying Force
Hand-tighten the jaw arrangement, check that every jaw is seated at the same depth, and recheck alignment after initial load is applied.
Frequently Asked Question
Can larger jaws solve every problem? No. Oversized jaws may not seat well in the available clearance. Correct reach, spread, and contact are more important than size alone.
For application-specific puller selection, DNT Tools can help review bore size, access, reach, spread, and pulling method before service.
Are you looking for a reliable manufacturer of Automotive Tools&Hand Tools?
We can quickly provide customers with market analysis, technical support and customized services.subscription