Jump to content

Rear steer


Guest mr_wuffles

Recommended Posts

Guest mr_wuffles

Could you fit a front axle on the back for rear steer? I think you'd need to cut the ends of and rotate them for it to turn the right way but apart from that would there be any other problems? You need some sort of dual acting hydraulic ram as well. I work with trucks and alot of them have rear steer fitted but the DAF's system seem to break all the time.

Link to comment
Share on other sites

Guest diesel_jim

IIRC there was an Australian 130 in the comics a few years ago that had the rear steer done on it. think it might have had Macnamara CV's and parts.

Link to comment
Share on other sites

Not with Landie axles - but I'm planning to go rear steer on MogLite

Axles are strong enough, and they are modular, so the centre section stays the same for a front or a rear :)

Just go a big road trip to plan to get my 2nd front axle from Lancashire

Link to comment
Share on other sites

You also get the fun and games of drift :(

The coolest system Ive ever seen was fitted to Frazier crop sprayers (they used a modified Rover axle to give 4 wheel steering), it had a cool control system go get over the dift issue that monitored the rear axle position and constantly corrected it - it also gave the operator the option of using different steering modes

Crab steer - diagonal drive accross fields (hand for really soft soft)

Rear Follow - giving the tightest turning circle possible

Conventional - drove like a conventional thing on a conventional day

Rear Steer - Drive it like a fork lift

Its an option for mouse but to solve the drift issue (without using a missle guidance system) on the road I will have the system lock off so its only there when its needed.

Mogs give the easiest solution - simply change the ends of the axle and its done B)

Link to comment
Share on other sites

Not with Landie axles - but I'm planning to go rear steer on MogLite

Axles are strong enough, and they are modular, so the centre section stays the same for a front or a rear :)

Just go a big road trip to plan to get my 2nd front axle from Lancashire

Flinking Blip Andy!! :unsure:

It hasn't even seen the light of day and already you want to change it!!! :o:o

I tell you, there's no pleasing some people..... ;):lol::lol:

Oh, and last month you said we'd get more piccies of Moglite this monh.... well, it's this month so where 're the piccies.... :P:ph34r:

Link to comment
Share on other sites

IIRC it was Maxi Drive stuff using 101 CVs and special swivels. Not cheap!

You are correct. Maxi-Drive have had a rear-steer kit on offer for a while (but it isn't cheap). It uses 101CVs, swivel balls machined from 4340 that are series LR size outside and big enough inside to clear the 101 CV. And Series swivel outers - with a custom-made disc mount (I think).

Steering is via a hydraulic ram, and only works in Low Range (usually). The steering is locked in the straight-ahead position for road use. Plenty of info on how to set up the hydraulics on www.pirate4x4.com

Now that longfield cro-mo CVs (and others) are around it may be possible to do a rear-steer setup using normal front axle parts. The CVs probably won't handle too much road mileage though.

Link to comment
Share on other sites

Bishbosh - I don't think the photos will be long... I saw it at the weekend, and its looking pretty complete - and pretty BLING too! :D

Me likey.

For those interested, Dollythelw's comment about Mog axles being a straight swap of the ends refers to Mog 404 axles. Sadly, not what I have... : (

Ideas seem to be filtering in from other places - States, Oz... I expect this'll become more common in the UK too.

Al.

Link to comment
Share on other sites

Oh, and last month you said we'd get more piccies of Moglite this monh.... well, it's this month so where 're the piccies.... :P:ph34r:

Its the 2nd already - still got 26 days to go.

I promise there will be a big photo shoot/web-site re-work this month :)

PS Rear steer has always been in the grand plan, as has nitrous :ph34r:

But possibly not at the same time.

Link to comment
Share on other sites

Just curious as to how come they will break in 300 seconds when fitted on the rear but not when on the front? :unsure:

The rear axle always sees more load/stress. This is the reason many 4x4s (even constant 4x4s) have larger rear axle (with thicker halfshafts) than the front.

Link to comment
Share on other sites

The rear axle always sees more load/stress. This is the reason many 4x4s (even constant 4x4s) have larger rear axle (with thicker halfshafts) than the front.

I still don't see why. If it was rwd them yes, but not if 4wd drive where torque is shared equally (an assumption) between front and back. For the sale of this discussion I am also assuming a canvas top so the weight is on the front axle - steering/engine; not something heavily laden in the back. I can only guess the reason for the fatter rear axles is for load carrying. It's not a bicycel where you sit over the rear wheel. :(

Link to comment
Share on other sites

Anybody know what sort of ram would be up to the task? Something off a JCB or a truck rear axle?

I haven't looked at the setup for the rear yet, but for the front hydro assist its going to be a

1.75" bore ~

8" throw

Single ended - double action

I think the rear will need a little more power, so maybe 2", they seem to use double ended rams Stateside, but I've not looked at it in detail yet.

Link to comment
Share on other sites

Anybody know what sort of ram would be up to the task? Something off a JCB or a truck rear axle?

A company called Steerforth Sales in Farnham are handy for rams of any spec - very cheap too. I used 2" bore with 6" throw double ended rams.

Valves etc are easily sourced off scrap forklifts or commercial sweepers

I've built 3 four wheel steer cars for trials - 1 with Suzuki axles, one independent suspension and the last with Volvo portals.

It is useful to have an automatic re-centering system as well otherwise you spend too much time fiddling with the rear and not concentrating where you're going.

Link to comment
Share on other sites

I still don't see why. If it was rwd them yes, but not if 4wd drive where torque is shared equally (an assumption) between front and back. For the sale of this discussion I am also assuming a canvas top so the weight is on the front axle - steering/engine; not something heavily laden in the back. I can only guess the reason for the fatter rear axles is for load carrying. It's not a bicycel where you sit over the rear wheel. :(

Moglite has the right answer. When climbing hills (or doing just about anything not on flat ground) the rear axle always sees more of the load.

Look at a 1970's range rover classic they have identical diffs front and rear, and indentically-sized axles. The front diff is actally slightly weaker than the rear as it runs on the coast side of the teeth. But I know heaps of people who have broken range rover rear axles and diffs, but very few that have managed to break fronts (talking about stock or near stock vehicles here). If the load was shared equally, you would break front diffs and CVs before anything else.

Link to comment
Share on other sites

┬┐Habla Espanol?

there's lots of good piccies here or rear steer mog axled rangie running 44's.

http://www.mda4x4.com/preparaciones.htm

which i presume was their testbed for thier own 4x4. you might consider it a sort of bowler on steroids, although i'm not sure it has many landie parts in the final model.

http://www.mda4x4.com/8250.htm

there's some videos down the bottom of it crabbing and turning tight circles and driving over huge boulders etc.

Link to comment
Share on other sites

Steerforth are possibly the nicest people in hydraulics and seem not to have missed reading the number one rule of hydraulic sales "thow shalt rip off the customer"

Double ended gives equal power to both actions, its easy to calculate the amount of power the ram will give you providing you know the working pressure of your PAS pump

najw - have you still got the "pics" you did for the self centre?? I think we nattered a while ago about the ones you had on the 7.56 Volvo axles :D

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We use cookies to ensure you get the best experience. By using our website you agree to our Cookie Policy