How do you test a slewing bearing?
One of the most basic indicators of slewing ring bearing problems is the condition of the lubricant. If metal particles or flakes are apparent, some form of wear is taking place. Grinding, popping, or clicking noises from the bearing typically mean there is inadequate lubrication and/or excessive wear in the raceway.
How does a slewing bearing work?
Slewing bearings comprise an inner ring and an outer ring, one of which usually incorporates a gear. Together with attachment holes in both rings, they enable an optimized power transmission with a simple and quick connection between adjacent machine components.
What is crane rocking test?
The rocking test comprises the measurement of the deflection between the crane pedestal and the rotating crane housing in the way of the slewing ring using a dial test indicator to determine the bearing clearances.
What are ring bearings used for?
A slewing bearing or slew[ing] ring (also called a turntable bearing) is a rotational rolling-element bearing that typically supports a heavy but slow-turning or slowly-oscillating loads in combination (axial, radial and moment loads), often a horizontal platform such as a conventional crane, a swing yarder, or the …
What is a slewing bearing used for?
What is a slewing crane?
In crane movement terms, a slewing crane lifts its load, suspends that load in mid-air, and then rotates it via a boom rotating mechanism. Non-slewing cranes, on the other hand, lack a rotating base section.
How long does a swing bearing last?
Wheel bearings have an average lifespan of 136,000 to 160,000 km (approximately 85,000 to 100,000 miles).
What is slew on excavator?
Slewing refers to rotating the excavator’s house assembly. Unlike a conventional backhoe, the operator can slew the entire house and workgroup upon the undercarriage for spoil placement.
What is rocking test of crane & how frequently you should perform it?
every six months
-‘Rocking tests’ are carried out every six months and that the results are recorded and monitored in order to ensure the wear tolerances remain within the limits. – The ship is adjusted to have least possible trim, preferably on even keel. – Bad weather / Windy situations are avoided.
How to avoid slewing ring failure with these six tips?
More than 96% of slewing ring failure could be avoided by following simple maintenance tips. Grease regularly. Apply a liberal shot of extreme-pressure grease to the fittings around the bearing’s circumference at intervals recommended in the operator’s manual. Purge with grease.
What to do if your ring bearing is failing?
Purged grease can help carry any contaminants out of the bearing. Inspect the grease. Rub some of the purged grease between your thumb and forefinger. If you see or feel grit or metal chips in it, there may be a bearing problem. Honor load charts. Even slight overloads can dimple the bearing race.
What’s the best way to grease ring bearing?
Apply a liberal shot of extreme-pressure grease to the fittings around the bearing’s circumference at intervals recommended in the operator’s manual. Purge with grease. Pump grease into the bearing until you see old grease squeeze past the seal.