komatsu d50a repower

[tassie devil]

hi all,seems like a good forum with a lot of experience.
just what i need ,so here is a question with a bit of history added in.

an old freind gave me a 14 tonne d50 dozer,[komatsu] built around 1966 from what i can gather,he paid 30 000 pounds for it then.
anyway the motor is really shot and as luck happens a freind also gave me a ford lehman diesel of similar horsepower but revs around 2000 rpm,the original 4 cyl d 120 had a max of 1200 rpm.

anyway as the bell housing on the ford is 10 mm or 3/8 too small to fit the original twin plate hyd actuated clutch assembly that was in the dozer onto the ford, im considering a dry type ex truck clutch to drive the 3 speed dozer transmission or should i say gear box.

so what are my chances do you think,
i only will use it for myself clearing a small acreage mainly in low gear.
the clutch i intend to try is off an old international 6 yard truck powered by a v8 petrol.

so come on fellows call me a stupid penny thrift,
or tell me that the idea might even work.

 

[banjodunn]

G'day tas and welcome to TBN Don't know how well it will go as your travelling speeds will be higher but hey it can't hurt to try the clucth should work but not sure for how long as you are on and of the clutch a fair bit on a dozer you don't know until you try and if it is onlly going to cost you time and little money then it is worth a shot. Good luck and keep us informed




Jon

 

[tassie devil]

thanks banjo
i will have a crack at it as time is cheap at the moment,but with the wife expecting twins it may take a year or two.

now im thinking if i were to incorporate the gearbok from the truck[as its short and will fit easily] into the equation i would have a lot more chance of getting the right ratio.would also have a shorter drive shaft then.
maybe lock it in second but would it work,i cant see why not and then the load on the clutch would be less,..

and does torque delivery play much part in a clutch size?
the truck is an old inter butter box that i have rusting away but is mech sound,and i was even thinking of trying the v8 inter motor in it but not sure of torque rates and rpm would be too high

anyway i will keep throwing ideas out until ive got something im reasonably sure might work.

 

[banjodunn]

G'day Tas not sure of the HP of your ford diesel but the old acco would have been around the 120 130 mark they used the same clutch behind them as they did with the perkins so if you are about the same as the old 6.354 you should have no probs. If you have got the eng out you can check the ratio of the orig box by marking the input shaft and output and counting how many rev's it takes of the input to one of the output then do the same with the truck box and you will get an idea how close you will be. Good luck with it where are you?


Jon

 

[tassie devil]

im on the west coast,near strahan
the original engine was around 100 hp i am told,and the clutch was a direct drive set up. the komatsu engine had two hyd pumps,one for the blade and one for clutch cooling and operation.

it would be easier to mount the inter engine in if i could select the gear ratio that gave around 600 to 1000 trans input rpm when engine ran around 1800 or so as i imagine that would be around the max torque curve

the butter box has a real low 1st,its a crash type box with a driveline circular brake.i know the dozer weighs 14 t,the truck loaded would of been around ten t or so

maybe i should fit it up,lock dozer trans in 1st or 2nd then use the inter box to change direction etc,it may put less load on it all?

 

[banjodunn]

G'day tas you are prob better off locking the acco box in about third and using the dozer box to change ratio's those old boxes are pretty good and strong and by using third you will be slightly under driving the dozer trans and giving yourself a bit more torque the best way would be to mount everything up and try it out to see what is the best ratio i don't think you will need to run in top as direct will be a bit quick me thinks. Strahan is a lovely part of the isle i have done a bit of touring there and have got friends in bridgenorth. Keep us informed of your progress


Jon