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TOPIC: GVM and GCM

GVM and GCM 01 Nov 2012 13:46 #324

Forum Home > On the Road > GVM and GCM

Rob
Member
Posts: 2
Hi I'm new to the forum. My name is Robert, I run Mission awareness tour for a Mission organisation we visit Aboriginal comunities in NSW, QLD and the NT. At the moment I use a Toyota Coaster Bus and tow a kitchen ,lugage trailer about 2t. Some of the places I visit are not really suiable for a Coaster so I'm in the process of looking into an Oka. I have some questions regarding the weight of the Oka bus that some of you may be able to help me with. My understanding is that the GCM is 7t if this is the case if the bus is fully loaded that only leaves 1.5t for the trailer. Can anyone tell me what the weight of a bus is with only fuel and no passengers? Also I would be interested to hear what other tour operators do to keep the whole rig legal in terms of weight.
We somtimes cover 8000kms in 2 weeks, how comfortable are the bus seats and in general how well do the OKAs ride? Also if the whole rig is 7t what speed on the flat is a realistic cruise speed?

Thanks for your time.

Rob
June 14, 2012 at 11:57 AM Flag Quote & Reply

Peter & Sandra James Oka 374
Member
Posts: 412
Tare on our van (bus body with two seats in the back and barn doors at the rear) was 4.2 t, I'd guess a bus body with all the seats is at least 4.5 or more. GVM is usually 5.5t on most with some buses and vans like ours having a 6t GVM. GCM on some is also 7.2t rather than 7t.
For what you are doing I'd stick with the Coaster, they are very tough and hundreds of them are used by remote indigenous communities and taken on tracks that many would hesitate to take a 4wd on let alone a laden bus. Parts and service would be more expensive on an Oka and less readily available with a far smaller seating capacity.
--
Oka 374 LT Van

June 15, 2012 at 7:59 AM Flag Quote & Reply

Pete Fox
Member
Posts: 140
Rob
An Oka in standard from can have the GVM and GCM upgraded. In my case this has been increased to 6600kg and 8400kg respectively.



I am currently towing a 2.2 tonne caravan without issue, my all up weight is about 7 tonne.
If I feel the need to lower the fuel level rapidly, on the flat I can cruise at 90-95kmh fairly comfortably, brick aerodynamics. I generally take it easy by travelling at 80kmh in 4th gear. This is due to the relatively high overall gearing with 305x19.5" tyres.

--
Peter Fox

OKA 266 Multi-cab.

Photobucket album



June 15, 2012 at 8:08 AM Flag Quote & Reply

Peter Davis & Serena Fraser
Member
Posts: 39
Peter what did you have to do to the truck to increase the GVM and gcm?
Peter Davis
June 15, 2012 at 6:13 PM Flag Quote & Reply

Peter_n_Margaret
Member
Posts: 198
I am not biased :-) but it appears that OKA ride is better than anything with the possible exception of a UniMog.
This is one of their very great strengths.
And they really are an extremely capable vehicle in terms of off road ability.
--
Cheers Peter, OKA196 Motorhome. www.oka4wd.com/xt196.htm



June 15, 2012 at 6:49 PM Flag Quote & Reply

Pete Fox
Member
Posts: 140
Peter
The uprating was done when I bought the truck. I spoke to Rex Ellis, the previous owner and he did no vehicle modifications. The engineer looked at the specs of the Dana axles and Oka springs etc and did the uprating based on those values. Just a paper audit really.
The only change was to specify 305 x 19.5 tyres.
IF you Google WDR Potts (the engineer) you will find some contact details. He is in Adelaide.
BTW I don't load to these weights but it is nice to know that I am legal all the time.
--
Peter Fox

OKA 266 Multi-cab.

Photobucket album



June 15, 2012 at 6:51 PM Flag Quote & Reply

Rob
Member
Posts: 2
Thankyou all for your replies and advice. Our Coaster has served us well, having said that since using it on some rough roads I have had to replace both upper and lower ball joints in the front suspension. The guy that does my wheel alignments on the bus said that he had never seen the wear like that in a Coaster and at $700 plus buck each time the cost of maintenance suddenley gets a bit expensive. I have heard of communities using Coaster but the comment was they get about 12 months out of them and they are stuffed. Maybe the older solid front end would be more durable. Another problem on the rough roads is the handling and if it rains you're in trouble, I have nearly been caught on a couple of occasions I'm also concerned about how long it will handle the constant load. I think that they are designed for around town and shorter runs. The cost of maintenance on our equipment is kept to a minimum because I do most of it myself. It would be good to hear what you think would be the main costs involved in running an Oka. I'm going to do up a proposal to give to my boss so if you have anything to share that would be great.
Rob
June 15, 2012 at 10:40 PM Flag Quote & Reply

Pete Fox
Member
Posts: 140
Rob
Talk to Paul Nott in Melbourne 0418125428.
He supplies kits to convert Coasters to 4WD. They are very durable apparently.
--
Peter Fox

OKA 266 Multi-cab.

Photobucket album



June 16, 2012 at 7:12 AM Flag Quote & Reply

len&rina
Member
Posts: 38
Pete Fox at June 15, 2012 at 8:08 AM
Rob
An Oka in standard from can have the GVM and GCM upgraded. In my case this has been increased to 6600kg and 8400kg respectively.



I am currently towing a 2.2 tonne caravan without issue, my all up weight is about 7 tonne.
If I feel the need to lower the fuel level rapidly, on the flat I can cruise at 90-95kmh fairly comfortably, brick aerodynamics. I generally take it easy by travelling at 80kmh in 4th gear. This is due to the relatively high overall gearing with 305x19.5" tyres.

Peter,when you had the GVM uprated,was there any explanation for upgrading to 305 tyres,or would 285s have sufficed.
Thanks Len
--


September 11, 2012 at 7:04 PM Flag Quote & Reply

Pete Fox
Member
Posts: 140
Len
this is just what is written on the plate, I don't know the reason behind it. It is obviously not the load carrying capacity of the tyres as 285's or even 265's would do it.
So I suspect it has to do with 305's being easier on the vehicle as these have a lot less harsher ride than the narrower ones.

--
Peter Fox

OKA 266 Multi-cab.

Photobucket album



September 11, 2012 at 7:38 PM Flag Quote & Reply

Chalkie
Member
Posts: 21
My LT is actually an HD. What is the "go" there?
September 14, 2012 at 6:04 PM Flag Quote & Reply

Hal Harvey
Site Owner
Posts: 510
Chalkie, why do you say HD?

Rob, I weighed my bus recently at 4680kg with one person on board, two spares, no water, 50 litres of fuel, and a little bit of gear on board. Ride is superb and far superior to most alternatives.

I'm fussy about seats and was happy with the originals until they were worn out. They're good.
--
Hal

September 17, 2012 at 11:49 AM Flag Quote & Reply

Chalkie
Member
Posts: 21
Compliance plate and rego paper states OKA HD MULTI BODY TRUCK.

GVM is 5500kg.
September 17, 2012 at 5:01 PM
David and Janet Ribbans - Oka 148
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