Rb44

[mendiplogs]

Too much wonga Jon, poor tree cutter here, not a millionaire log salesman 😛

 

HI CHRIS this 3000 is not loads of money I've just google 1650 theres loads out there but you some to take as you no to look at them mate thanks jon

[TotalTreeCall]

Billy the ex army RB`s are the same vehicle with the exception of the twin wheel rear axle as the civvy ones. I have a couple of the twin wheeled ones and they are 7.5 ton gross with a 11 ton train weight. So really any RB will tow and carry the same as a 7.5 tonner but the plated weights would need to be uprated to those of the civillian ones. Note the max permissible weight of the rear axle at 5.6 tons, I dont think that will break with an arb type tipper body full of chip and they tow heavy trailers really well , so well in fact you need to keep checking your mirrors to see if its still on there. Spares are no problem at all, the brake parts are all available but not cheap so when I get time I will be looking at upgrading to discs all round.

 

Bob

 

http://arbtalk.co.uk/forum/attachment.php?attachmentid=168131&stc=1&d=1414830526

 

Bob, I am in the process of 'uprating' my RB from 5.3 tons to 6.6 tons. I am fitting the rear axle from a Dodge 50 S75 (which had air over hydraulic breaks) and will power these breaks with my current Vacuum over hydraulic breaking system. I have been told that if I then only fit the outer wheel onto this twin wheel axle (ax8) then I can get the truck uprated to 6.6 (because it will be vacuum breaks powering the 7.5 (originally air assisted) axle).

 

I have been told all this by Greg Wells who runs the Dodge 50 parts website etc...

 

Can I just ask, was yours a conversion done by Boughton, and are they running 'air assisted' breaks? or just vacuum over hydraulic with twin wheels fitted?

 

Jim.

[aspenarb]

Bob, I am in the process of 'uprating' my RB from 5.3 tons to 6.6 tons. I am fitting the rear axle from a Dodge 50 S75 (which had air over hydraulic breaks) and will power these breaks with my current Vacuum over hydraulic breaking system. I have been told that if I then only fit the outer wheel onto this twin wheel axle (ax8) then I can get the truck uprated to 6.6 (because it will be vacuum breaks powering the 7.5 (originally air assisted) axle).

 

I have been told all this by Greg Wells who runs the Dodge 50 parts website etc...

 

Can I just ask, was yours a conversion done by Boughton, and are they running 'air assisted' breaks? or just vacuum over hydraulic with twin wheels fitted?

 

Jim.

 

Jim the 7.5 tonners have air over hydraulics for brakes and are fitted with a spring brake (air) for secondary braking + air couplings for the trailers. Uprating is straightforward as long as the braking efficiency target can be met, its measured as function of plated weight so as soon as you are done run it down to a commercial brake tester and get a reading. It needs to be well in and not marginal or it will cause problems. I will be doing the same thing to the one below but will rob all the bits off one of the festering 7.5 tonners , I was thinking of a fifth wheel coupling and making this into a mini artic with a small crane behind the cab.

 

Bob

 

[TotalTreeCall]

Jim the 7.5 tonners have air over hydraulics for brakes and are fitted with a spring brake (air) for secondary braking + air couplings for the trailers. Uprating is straightforward as long as the braking efficiency target can be met, its measured as function of plated weight so as soon as you are done run it down to a commercial brake tester and get a reading. It needs to be well in and not marginal or it will cause problems. I will be doing the same thing to the one below but will rob all the bits off one of the festering 7.5 tonners , I was thinking of a fifth wheel coupling and making this into a mini artic with a small crane behind the cab.

 

Bob

 

 

Thanks Bob,

 

So your two 7.5 ton RB's have identical air breaks as the S75's then? Are they Boughton conversions or did Boughton actually build them to that spec originally (presumably using pretty much S75 components?) I'm only asking because I notice on the photo of the plate you uploaded a few pages back it say's Boughton "Conversion", I'm interested because obviously in a perfect world I would also rob all the air breaking parts of an S75 and convert my RB to Air over hydraulic at some point... So interesting to know if Boughton did a conversion on these or built some original off the shelf 7.5 tonners etc... Greg (dodge50.co.uk) only knows of one person who has done this conversion and reckons it was a pain of a job swapping over the entire breaking system to air.. Nice looking RB by the way!

 

Thanks for the advice, I am paying a lorry garage to change the axle and they do Lorry MOT's so will get them to test the breaking spec once done.. Presumably this is what the tester from DVSA will do to test and then authorise the 'uprating' to 6.6 ton.

[aspenarb]

Thanks Bob,

 

So your two 7.5 ton RB's have identical air breaks as the S75's then? Are they Boughton conversions or did Boughton actually build them to that spec originally (presumably using pretty much S75 components?) I'm only asking because I notice on the photo of the plate you uploaded a few pages back it say's Boughton "Conversion", I'm interested because obviously in a perfect world I would also rob all the air breaking parts of an S75 and convert my RB to Air over hydraulic at some point... So interesting to know if Boughton did a conversion on these or built some original off the shelf 7.5 tonners etc... Greg (dodge50.co.uk) only knows of one person who has done this conversion and reckons it was a pain of a job swapping over the entire breaking system to air.. Nice looking RB by the way!

 

Thanks for the advice, I am paying a lorry garage to change the axle and they do Lorry MOT's so will get them to test the breaking spec once done.. Presumably this is what the tester from DVSA will do to test and then authorise the 'uprating' to 6.6 ton.

 

I am not sure of the interchangeability of parts between the dodge version and the RB44`s. The ones I have all say Reynolds Boughton on the V5`s so they are not conversions. One thing that springs to mind swapping the axle is making sure it has the same diff ratio as your front axle, the last thing you want is that lot winding up when you select 4WD. Other than that how are you going to get the handbrake to release? the air brake axle needs air to get it to release. Also may be worth getting the train weight uprated at the same time, the 7.5 tonners can legally tow a 3.5 ton trailer. Are you AG registering it? I will be breaking one of them so let me know if you need any bits.

 

Bob

[TotalTreeCall]

Billy the ex army RB`s are the same vehicle with the exception of the twin wheel rear axle as the civvy ones. I have a couple of the twin wheeled ones and they are 7.5 ton gross with a 11 ton train weight. So really any RB will tow and carry the same as a 7.5 tonner but the plated weights would need to be uprated to those of the civillian ones. Note the max permissible weight of the rear axle at 5.6 tons, I dont think that will break with an arb type tipper body full of chip and they tow heavy trailers really well , so well in fact you need to keep checking your mirrors to see if its still on there. Spares are no problem at all, the brake parts are all available but not cheap so when I get time I will be looking at upgrading to discs all round.

 

Bob

 

http://arbtalk.co.uk/forum/attachment.php?attachmentid=168131&stc=1&d=1414830526

 

Hi Bob,

 

It is already registered as a special purpose vehicle (different to Ag) because it has a wood chipper permanently mounted + 3 point linkage + constant 4x4 and 4x4/road tyres etc..

 

I did get Greg to make sure that the dif ratios would be compatible when diffs locked etc, and he assures me that the AX8 axle off of a S75 will be fine.

 

He also reckons that others have managed to sort the hand brake and change it over to manual linkage etc.. He says he knows others who has done it..

 

In your pic (hopefully attached) it says "conversion" so maybe boughton converted some?? probably the same axle as I am putting on mine if twin wheel, only I am only gonna use the outer wheel and rate at 6.6 ton.. Thanks for advice about train weight I will ask the DVSA people about that. Also parts, yes very probably!