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3DDave: This seems a bit illogical, but the truth is my PC crashed just last month, and all files were lost. Let me do again and bring up here. MintJulep: yes, agreed.

added a thrust bearing above single tapered bearing will resist the movement of wheels at rib. And 2 bearings will handle all the forces, moments, The most resistant for prying moment is 2 wheels at rib support. Which is supportive to the top bearing to focus on rotating mechanism, and the...

@all: structure calculation is sufficient for load test, base metal is A572-50/yield strength 355 MPa, column OD 914 x 8mm thickness. Base plate 40mm, crane boom thickness 16mm. Pin & Wheel is S45C + PWHT. LittleInch: jib crane is sufficient with load test at 7 meters point of crane boom...

Hi MintJulep, i load tested at the closest point to center of column, start moving trolley to the farthest, and when it reached 7.5 meter, crane boom sagged down. And i start thinking about rotating mechanism had problem. Yeah, seem like the resistance to prying moment not good enough. I...

Hi geesaman, Thank you for your great advise.

Is this what we are referring to ?

Hi geesaman, Does it mean i need to add a bearing above taper bearing to preload?

Hi MintJulep, i failed during actual load test.

Hi Littleinch, Force at C and D are 765 kg ~ 7650N.

Hi rothers, See below analysis result.

Dear all, Please help me on this issue. i did load-testing for Jib Crane, some information as : Lifting height: 9.5 meters Crane radius : 8 meters SWL : 3 ton Single tapered roller bearing : dynamic load : 245 kN, static load : 365 kN I used single tapered roller bearing (SKF) with pin and...