Thread: Ian's Volvo TGB13 6x6

Originally Posted by roobar_and_custard

Hijack away, all good info. Nice to be able to transfer Volvo know how to 101s

Schematic of mine a bit like this...
Wheel to column, through shaft to bevel box. Bevel box facing rearward to power steering box with pitman arm reversed.

Hopefully, with all that, when I steer right (clockwise), the bevel box changes to anticlockwise which in turn causes the steering box to turn right too. Otherwise I'm in trouble...

Yeah, that's the trick - finding a box that moves the pitman arm in the right direction. I believe the GQ unit does this for the 101 and may also be suitable for your application. I'm going to play with one at a wreckers tomorrow and make sure it's right - I'll report back on my findings.

Just looking at your drawings, I think it needs to run the same as the 101, so you may be in luck.

Ian, after looking at you pic, I think you need a box that operates in the reverse to what the 101 needs. That would mean a GQ Patrol box would work for you.

....I Think..... Go and check one out at a wreckers, but I think I'm right...

I've drawn that picture a 100 times and I'm still not 100% sure - maybe 99%.

The best point of reference is the Series FC that DasLandRoverMan built, which as far as i can tell is exactly the same concept. I'm pretty sure that one worked fine with the pitman arm reversed - ie pointing forward on a backward box.

The only way I'll know for sure is to finish off the steering. I'll either end up with a nice conversion or a quirky fairground ride.

Note that AJs conversion has a reversed steering box (allegedly) and standard pitman arm position on a backward (ish) box...
Arrgh... now i'm all confused again....

Originally Posted by roobar_and_custard

I've drawn that picture a 100 times and I'm still not 100% sure - maybe 99%.

The best point of reference is the Series FC that DasLandRoverMan built, which as far as i can tell is exactly the same concept. I'm pretty sure that one worked fine with the pitman arm reversed - ie pointing forward on a backward box.

The only way I'll know for sure is to finish off the steering. I'll either end up with a nice conversion or a quirky fairground ride.

Note that AJs conversion has a reversed steering box (allegedly) and standard pitman arm position on a backward (ish) box...
Arrgh... now i'm all confused again....

It does. There are 2 different boxes that look similar - one (patrol) has the pitman arm facing forward and moves left as the input is turned left. The other box has the pitman arm pointing backwards and moves left as the input is turned left - the reverse of the Patrol box.

Make any more sense? Easiest way is to go to a wreckers and look how they work - it helped me a lot.

Standard land rover is turn right for right with the arm pointing forward, and turn right moves the arm left if it's backward.
This used the same bevel box as you have got for the job.

A left hooker with a RHD disco box mounted with the input facing forward and the pitman arm also facing forward will operate the steering correctly if the drag link is on the front of the axle.

Well I'm sure now. Checked the steering box (from a Disco) and confirmed rotation is correct.
Picture shows standard set-up as removed from Discovery, pitman arm in original position. Still need to remove and turn 180 degrees, which has the effect of reversing the steering direction.

And some progress on the remaining steering set-up.

Fitted boss and steeing wheel - position is pretty good really and heaps better than the original.

Cut the hole in the floor for a "bulkhead" bearing after lots of measuring, for the lower shaft to exit through the floor. And yes, it does work with the pedals.
Top of shaft needs to be supported (parts in post).
Needless to say, hole saw was too small, so after some 60 minutes of filing...

Murphys law dictated that the ideal location happened to line up with an underfloor reinforcement... exactly! What were the odds?

Lower shaft is currently made of wood (my favourite prototyping medium - see picture) to confirm the basics work ok.

Will need custom lower shaft to be made with the purchased coupling welded on and a spline to match the Freelander column - any recommendations on a suitable company who could help?

Cheers.
Ian.

And made up bracket in MDF for bevel box, but as yet this final(ish) version untried...