Pullers
Items are being added
KIT is adding items to this category. If you need a specific part, please send a quote request.
Frequently asked questions
How do I choose between two-jaw and three-jaw pullers?
Three-jaw pullers spread the load evenly and slip less, so they are the default for bearings and round pulleys. Two-jaw pullers are used where only two grip points exist or space is limited. Size by both the maximum spread and the reach depth of the jaws.
Will pulling a bearing damage it?
If the jaws pull on the outer ring while the inner ring is the tight fit on the shaft, the force passes through the rolling elements and brinells the raceways. Pull on the ring with the interference fit, and use a bearing separator when the inner ring cannot be gripped. A bearing removed this way should not be reused.
When is a hydraulic puller preferred over a mechanical one?
Mechanical pullers use a forcing screw turned with a wrench and suit small to medium parts. Hydraulic pullers use a ram to generate forces rated in tonnes, requiring less effort and avoiding damage to the forcing screw on tight gears and couplings.
Should the part be heated when using a puller?
Heating a bearing or hub expands the bore and reduces the pulling force, but temperature must be controlled, typically not above about 120 degrees C for bearings, to avoid losing hardness. Avoid open flame near rubber seals or grease.
Do pullers need maintenance?
Grease or oil the forcing screw thread regularly and keep it free of chips, since a dry thread raises friction and lowers the real pulling force. Check the jaw hooks for cracks, deformation or opened angles. Bent jaws slip off the part under load and must be replaced.
How do I size a puller to the part?
Measure the largest outside diameter to be gripped and the distance from the shaft end to the gripping point, then choose a puller whose spread and reach exceed both. The rated force, usually given in tonnes, must also suit the tightness of the fit. A puller much larger than the part is hard to center and tends to slip.
Is a guard needed when using a puller?
Yes, a part can release suddenly when the press fit lets go, and broken jaws or parts can fly. Use a guard or wrap the puller in a safety blanket, wear eye protection and do not stand in line with the puller axis.
Should the forcing screw tip sit in the shaft center hole?
The screw tip should bear in the shaft center hole or on a protective pad so the force stays centered and the shaft end face is not damaged. Off-center force tilts the puller and the jaws slip. For hollow or threaded shafts, use a suitable adapter cap.
