692 parts · 30 makes
Swing Bearings
Slew rings and swing bearings for the house rotation circuit.
Know the part before you order.
The swing bearing carries the entire weight of the upper structure while it rotates. DYCO carries 692 distinct swing bearing part numbers across 30 manufacturers.
Request a swing bearing Find a dealer
Specified by DYCO: alloy grade, heat-treat target, seal and bearing grade. Country of origin, stated in writing. How a DYCO part is built →
Warranty — 1 year. Returns run 30 days from purchase, dealer to DYCO. A return and a warranty claim are different things — both are on the warranty and returns page →
No part number?
Measure the old bearing.
Send these nine numbers to your dealer, in millimeters, with the machine’s make and model. The dealer will confirm which replacement fits.
Outer ring
- 1Outside diameter
- 2Inside diameter
- 3Height
- 4Number of bolt holes
Inner ring
- 5Outside diameter
- 6Inside diameter, across the teeth
- 7Height
- 8Number of bolt holes
Gear
- 9Number of teeth
Before you buy one
Worn out, or bolted in wrong?
Before you replace a swing bearing, make sure the bearing is the problem.
Measure the play
Measure tipping clearance with a dial indicator, boom out, and compare it with the machine maker’s limit. Write it down: a second reading later shows how fast it is wearing. DYCO-TP-110 — Dimensional and Metallurgical Verification of Replacement Drive Units →
Check the mounting bolts
Loose or stretched bolts feel just like a worn bearing, and they cost far less to fix. A stretched bolt must be replaced, not re-torqued. DYCO-TP-109 — Preload and Fatigue in Slewing Ring and Final Drive Bolted Joints →
Teeth and raceway wear separately
Worn gear teeth do not mean a worn raceway, or the other way round. Check both before you decide what to buy. DYCO-TP-102 — Contact Fatigue, Pitting and Spalling in Planetary Gear Sets →
Keep it greased
Grease on schedule, until old grease pushes out past the seals. Water and grit that get past the seals pit the raceway. DYCO-TP-114 — Grease Lubrication of Slewing Rings: the Raceway and the Open Gear Mesh →
Ask how it is hardened
The raceway carries the load on a hardened layer a few millimeters deep. You cannot see it from outside, so ask how it is specified. DYCO-TP-105 — Induction-Hardened Raceways in Slewing Ring Bearings →
Machine down? Start with the number on the tag.
Send the part and your machine to a dealer from here, or email the make and model and we will point you at one who stocks it.