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#11790 - 06/29/13 08:34 AM Re: THE BEAST (tracked personal vehicle) [Re: Bountyhunter]
jeapadrenaline Offline
MBN member
Registered: 09/28/12
Posts: 251
Loc: bc, canada
lincoln, if you end up back at the IMT dealers, bring your camera. i would love to see pics of the bombardier, inside and out. the more the better.
as for throttle cable, turns out the biggest problem is actually the pedal assembly not having enough pull.
for lowering the drive speed, i am still puzzled due to the fact that i simply do not have any room to add anything, ie.modded transfer case or even chain and sprockets.

on a brighter note, i did get ignition, charging system wired up, including electric fan, oil gauge, tach, temp and volt gauge plus an alternator dummy light (amp light). found out my keyed ignition switch works intemittently so gotta replace it. no big deal.
when i installed the oil pressure sensor, i ended up cracking the housing that the oil filter spins onto. went to replace that housing, turns out its the oil pump. good thing i have two spare motors. leak is fixed.
had the beast running in the shop for nearly an hour, runs ok, smokes a bit when i hit the throttle, but i figure the rings may be a bit gummed up still. electric fan kicked in a few times, but kept temp at 190. oil is at 50 psi at idle and up to 70psi full throttle. voltage at 14 volts, but on startup need to blurp the throttle to excite the alternator, no biggie.
still has runnability issues on accelleration, i think she gets too much air (wide open carb). when i lightly over the throat with my hand, she stumbles a lot less when hitting the throttle, so today i think i will try and fit and install the air cleaner.
if this rain stops at all today, i may try another test drive, wish me luck.
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#11791 - 06/29/13 04:59 PM Re: THE BEAST (tracked personal vehicle) [Re: jeapadrenaline]
Lincoln Offline
MBN Enthusiast
Registered: 03/25/11
Posts: 591
Loc: Parry Sound Ontario Canada *****
I have no idea when I may go back there.....it would end up costing me money.. eek
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#11792 - 06/29/13 07:46 PM Re: THE BEAST (tracked personal vehicle) [Re: Lincoln]
jeapadrenaline Offline
MBN member
Registered: 09/28/12
Posts: 251
Loc: bc, canada
lincoln, no problem. if you do, a close up of drive system and suspension would be great. reason being as follows....

well, orderd a carb kit today. got impatient and dissasembled the carb and cleaned it anyways. runs a bit better, but the accellerator pump is shot i think.
anyways, went for a drve with it. not happy
ran off the tracks 4 times within 100 yards. poblem being, oo much traction for one. the other problem is that the walking beam suspension loosens up the track way too much. rear most wheels shouldbe stationarry to keep even track tension.
so i think i will modify the rear in sucha way that there is zero suspension. the only movement will be rearward, aka tightening the track.
i kinda doupt that the walking beam would be much smoother than solid anyways.
as for gearing, it deffinately is too fast, but once the engine runs smooth and accellerates the way it should, i think i can live with it for the time being.
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#11801 - 06/30/13 03:56 PM Re: THE BEAST (tracked personal vehicle) [Re: jeapadrenaline]
jeapadrenaline Offline
MBN member
Registered: 09/28/12
Posts: 251
Loc: bc, canada
well, its a sunny and hot sunday, so i spent some time in the shop.
suspension is no more, its all stiff now. had another carb thats in a bit beter shape, so i switched it. runs a bit better now.
also went for a boot around the yard. didn run off the tracks, but came close a couple of times. its a lot better, and no more rough than with the suspension.
the track tightening system that came with the machie was supposed to work on grease. well the tollerances arent close enough, so it pushes the grease out and releases the tension before i can fix them in position. i am going to mdify it and just use a large threaded rod to push the blocks out. for now i will just use a small jack to tighten the track. hopefully this will eliminate the track throw.
finally seeing some progress. smile smile
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#11803 - 06/30/13 09:57 PM Re: THE BEAST (tracked personal vehicle) [Re: jeapadrenaline]
poleframer Offline
MBN member
Registered: 02/25/10
Posts: 159
Loc: Cave Junction OR
Would there be room to mount a short jackshaft over the existing driveshaft, or next to it?
If you did that, and got rid of the driveshaft you could put a gear on the transmission yoke, chain to a gear on the jackshaft, then another gear on the differential yoke with chain to a second gear on the jackshaft, you would have a lot of gearing options to play with that way, and you wouldnt need very large gears to step down twice for a lot of reduction.
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#11813 - 07/02/13 07:43 PM Re: THE BEAST (tracked personal vehicle) [Re: poleframer]
Joey Offline
MBN member
Registered: 09/11/10
Posts: 181
Loc: Wabush, Labrador, Canada
hopefully someone with more experience with np203 transfercases can confirm but I THINK you might be able to pull gear reduction box off the front of a np203 transfer case , make a plate up to go where it used to bolt to the chain case to hold the bearing and oil into it, and get creative with the input and output shafts. You just might be able to make it work, I gave away a 203 a year ago but my buddy didnt use it, if he still has it I will get it and pull it apart to see if its a do-able idea before you go hunting for a transfer case.
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#11816 - 07/02/13 10:03 PM Re: THE BEAST (tracked personal vehicle) [Re: Joey]
Gator Offline
MBN Enthusiast
Registered: 02/15/10
Posts: 776
Loc: Corinth, MS *****
Gears of a np203



Shaft



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#11817 - 07/02/13 10:06 PM Re: THE BEAST (tracked personal vehicle) [Re: Gator]
Gator Offline
MBN Enthusiast
Registered: 02/15/10
Posts: 776
Loc: Corinth, MS *****
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#11822 - 07/03/13 11:40 AM Re: THE BEAST (tracked personal vehicle) [Re: Gator]
Joey Offline
MBN member
Registered: 09/11/10
Posts: 181
Loc: Wabush, Labrador, Canada
Gator what you have is the np205, a MUCH better case, fully gear driven. the 203 has a gear reduction box on front of a case which drives the front via a chain, has no 2wd just 4 and 4 lock. there is a differential between the front and rear output so the truck is awd. kits are available to bolt the 203 gear box on front of the 205 for a double reduction achieving a 4:1 ratio!!!

here is a 203 setup.


here is the reduction box removed from the unit.


and for the sake of conversation here is a 205 like gator has with the 203 reduction box on it.
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#11823 - 07/03/13 01:11 PM Re: THE BEAST (tracked personal vehicle) [Re: Joey]
Gator Offline
MBN Enthusiast
Registered: 02/15/10
Posts: 776
Loc: Corinth, MS *****
This is like déjà vu all over again. Bunkclimber knows what I mean. Bunk corrected me on this 2ish Yeats ago and in glancing back I screwed it up again.

Oh well ignore above pics......or buy a np205 and mate it to your 203 to get a double reduction. Yeah that is what I was going for..

BTW I still have the np203 that is shown on the first page of my thread. Similar to the one shown above. If you need it and have a way to get it I would give it to you cheap (read free)
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#11826 - 07/03/13 08:29 PM Re: THE BEAST (tracked personal vehicle) [Re: Gator]
jeapadrenaline Offline
MBN member
Registered: 09/28/12
Posts: 251
Loc: bc, canada
thanks guys, just what i am looking for. if i could ever keep the tracks on the beast.
i rebuilt the carb, runs MUCH better now. still have the throttle issue, but i will fix that someday when i have time.
tracks got tightened up, allmost singing tight, and they still fly off. wheel guides arent tall enough maybe. not sure.
kinda stumped.
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#11828 - 07/04/13 04:40 AM Re: THE BEAST (tracked personal vehicle) [Re: jeapadrenaline]
ktmtragic Offline
MBN member
Registered: 07/04/10
Posts: 235
Loc: Sydney Australia
Pump your fitting full of grease remove the grease nipple connect a fitting to your airline at low pressure and you have all the time in the world to tension track. How do I know hired a machine for the weekend same problem no one available Sunday. Worked great. Just increase air pressure SLOWLY
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#11830 - 07/04/13 07:33 AM Re: THE BEAST (tracked personal vehicle) [Re: ktmtragic]
jeapadrenaline Offline
MBN member
Registered: 09/28/12
Posts: 251
Loc: bc, canada
thanks ktmtragic, i actually removed the grease tensioner system as it was leaking everywhere. i have installed a large ready rod and use the nut ti tighten the track now.
its tight as all hell now, and they still walk off...
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#11843 - 07/07/13 01:04 PM Re: THE BEAST (tracked personal vehicle) [Re: jeapadrenaline]
jeapadrenaline Offline
MBN member
Registered: 09/28/12
Posts: 251
Loc: bc, canada
so,i am now in the process of reducing traction on the beasts tracks. removing 2 grouser bars at a time, drilling ou the outside hole and re-installing with shorter bolts, so the bolt heads aren't sticking out. hopefully that will fix the track throwing problem.
its a slow proess, but its easier and quicker than to fully remove the tracks.
once done, i will take it for a test drive andtry to set up my laptop to take a video on the webcam. crappy pic quality, but it will have to do. till next update, enjoy the weekend you guys.
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#11844 - 07/07/13 05:35 PM Re: THE BEAST (tracked personal vehicle) [Re: jeapadrenaline]
poleframer Offline
MBN member
Registered: 02/25/10
Posts: 159
Loc: Cave Junction OR
sounds like a plan, I was gonna suggest you have someone video you driving it, and watch whats happening when the tracks come off.
Maybe it needs some guides where the tracks go onto the sprockets, I'm guessing thats where they go off at, if you can keep them tracking going onto the sprockets they will probably track on the wheels ok, but hard to say.
With a video taken you can slow it down to see exactly whats going on.
Dont give up, that machine is so close, and will be great to have when you are slogging around in the snow come winter, I sure do love my tracked machine for winter use, it's the summertime stuff that does the most damage, my rubber tracks are 800 bucks a set, and gravel or rocky ground really tears the cleats off, but tracks are far superior to wheels in the snow.
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#11847 - 07/08/13 09:40 PM Re: THE BEAST (tracked personal vehicle) [Re: poleframer]
jeapadrenaline Offline
MBN member
Registered: 09/28/12
Posts: 251
Loc: bc, canada
ok, back to the transfercase and the guys who are in the know. what vehicles came with the np203 t-case? knowing that may help me track down an np203.

i got one track modified, but ran out of bolts. nobody seems to stock more than 100 or so of any given size, so i'll be ordering some tomorrow, hopefully get the second track done before the next weekend arrives. and for me that means sunday/monday.
also found out, that the carb needs a bit more fine tuning yet. wont want to stay running at first startup, but once she warms up a bit she runs like a champ.
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#11848 - 07/09/13 03:25 AM Re: THE BEAST (tracked personal vehicle) [Re: jeapadrenaline]
bunkclimber Offline
MBN Old hand
Registered: 02/14/10
Posts: 1097
Loc: Maryland *****
The NP203 came in nearly every GM/Chevrolet back in the 70's-early 80's until the lighter weight,all aluminum NP208 replaced it around 1983.The 203 is common to full-size Blazers and 1/2T pickups,even some 3/4T pickups got em too.There were some production line variations,GM had problems with the adapters between the trans and the transfer case,there's a couple of versions out there.The 203 was usually behind an TH350 automatic,the stick shift pickup trucks mostly got the NP205.Dodge used the 203's and 205's as well,not sure on what input shaft spline arrangements they had.GM used a coarse spline for stick shifts and a fine spline male for TH-350 automatics,a female fine spline for the TH-400.It's becoming harder and harder to find ANY old 70's/80's vehicles anymore in yards,they are all crushed and long gone here.Ask at the yards,sometimes they have a sea container full of old transmissions and t-cases..Most ANY yard will pull these parts before crushing anything.A good NP205 pulled on a pallet goes for $350-500 here in MD,and they are getting harder and harder to find.The 203s had a bad reputation for chain wear,most always replaced with a 205. I already have my stockpile of NP205s,but no 203s..good old stuff that will never be made again..Literally a ton of iron on a pallet!


Originally Posted By: jeapadrenaline
ok, back to the transfercase and the guys who are in the know. what vehicles came with the np203 t-case? knowing that may help me track down an np203.


Edited by bunkclimber (07/09/13 03:35 AM)
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#11849 - 07/09/13 09:27 AM Re: THE BEAST (tracked personal vehicle) [Re: bunkclimber]
GLyford Offline
MBN member
Registered: 02/09/10
Posts: 377
Loc: central MA
The ranger/bronco-II guys make "doublers" out of the BW 1350 and/or 1354, which might be a little easier to find. The electric shift ones are cheapest and you don't have to use that bit if you're never going to shift it. Not sure what the relative size difference is compared to the NP...
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#11850 - 07/09/13 02:54 PM Re: THE BEAST (tracked personal vehicle) [Re: GLyford]
jeapadrenaline Offline
MBN member
Registered: 09/28/12
Posts: 251
Loc: bc, canada
So my guess would be that the bw 1350 and 1354 are found in rangers and bronco II???
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#11851 - 07/09/13 08:43 PM Re: THE BEAST (tracked personal vehicle) [Re: jeapadrenaline]
FabberMcGee Offline
MBN member
Registered: 03/14/10
Posts: 182
Loc: Fairbanks, Alaska
The New Process 203 and 205 are huge and heavy. Way more than you need for this little rig. The hot rod 4 x 4 guys say they will stand as much as 600 horsepower reliably.

The Borg-Warner would be a far easier to fit in your machine and no doubt plenty strong.
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