Hello Dandh

Jacking is typical when removal of wheels or bogies is required. You need to watch stability during jacking if there are any horizontal pivots about (it does not appear so from your sketch) and for wind conditions while on the jacks. This is because you may be removing your horizontal constraints from the rail head. In general, a detailed lifting study is performed if a jacking procedure has not been provided by the designers.

Finally, to minimise your risk with respect to what you may find once taking bogies apart, is to fabricate a new bogie with wheels and drives fully assembled. Replace an old one with it during one jacking. You can then return to operating while You refurbish the assembly that has just been removed and cycle it back into the machine during another jacking. Repeat the process until all units are replaced or refurbished. You may choose to fabricate more assemblies for replacement during a single jacking.

kind regards

Helmut Mayer ■

Hello Dandh

That is an intersting patent indeed, allowing you to lift a number of wheels off the rail on the run(?) in order to get around a radius that is tighter than what the long travel equipment is set up for.

Though, I don't think you will need anything as complex as that. Your trick will lie in providing a jacking pad from which the jack lifts the corner while retaining horizontal restraints to a required level. This would be a static thing fabricated from a few bits of rolled section.

regards ■

My posting seems to go AWOL

There are 2 ways of doing this.

Jack the machine up...use the "hooks" as they appear > need a cross beam to straddle the rail/bogeys and support either side.

I think U had an issue with civil works - need to resolve this...is there a maintenance position.

Be careful with pivot points, esp. those with are 360 deg. degrees of freedom. We have an OEM manaul that shows jacking under a free support beam with no lateral support!!

The OEM must have some details of boegy maintenance.

The other way is similar to the free patent.

Set up the machine pivots with limited travel eg weld in stops.

Drive the machine up onto some tapered wedges on the rail (one bogey set only) > if U havce set it up right, the other bogey on the same pivot will lift off the rails > presto.

Hi Helmut > the above procedure is what we did with the PHB shiploader to change the bearings. Need to ensure lateral guidance. U only need a millimeter clearance to change the wheelset etc....

The only other way is to weld on some side support beams close to the bogey and jack up locally to them.

Cheers

James ■

Hello Dandh

That reference was merely a way of saying 'from where you do the jacking'. The word 'corner' as used by us means such that your machine would be a three corner machine. Having said that, I used the word a little casually, and your operation likely will not require to jack a whole corner, but merely a particular group of wheels.

Whatever strategy you end up employing, please be sure to run it by someone who is suitably qualified and experienced to assess the relevant design risks and to advise you on appropriate measures.

regards ■

Your idea is OK and will work

I thought that U had civil support issues.

We employed the tapered wedges idea with success on our shiploader > no jacks required.

Cheers

James ■

Hello James

That is a nice idea with the wedges. I must pick your brain about that one one day.

Helmut ■