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Snowcat Restoration & Modification Projects Forum Major Restorations, Upgrades, and Non-Stock Snowcat Modifications

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  #141  
Old 02-27-2014, 06:05 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

that is going to be a lot larger problem in wet snow than dry sugar like I usually operate in.
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  #142  
Old 02-28-2014, 12:33 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

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Originally Posted by turbinator62 View Post
I adjusted the clutch about three times but it kept popping out of gear when under load, or uphill. The last time I adjusted it, the adjustment hit the limit, and something popped inside and wouldn't lock at all. It was still drivable by holding the clutch handle back. I am guessing that the locking cams were worn out and finally broke. I'll pull the engine when I get it home this spring and fix it.

We get a lot of heavy wet snow in our area, especially after a warm spell. The rear end is so low that it has to push a lot of heavy snow under the tub, which uses a lot of power, and this rig doesn't have much to spare. There are springs with the same width and center distance available from SD Truck Springs for 20 bucks http://www.sdtrucksprings.com/index....roducts_id=331 with a 2" higher arch which would really help matters. They are 1/4 inch thick as opposed to 3/16 but I think I would remove the short helper and just use the two layers. I bought a couple already and will try them when I get it home. I would have to machine new bushings with a 1/2" hole but that is no big deal. This would also increase the approach angles on both ends and tighten the track. New spring above, old one (without top two layers) below.
Jeff, thanks for all the great photos, good to see you're having fun with your Imp.
I think you're on the 'right track' with springs, the original 3/16" thick leaves don't seem to be adequate even on a stock Imp, and yours has quite a bit more weight added. When I first rebuilt my 1402 I had the main leaves re-arched and added new secondary 1/4" leaves. Even that wasn't quite enogh, as it's sagged about an inch in the 30 years since then. I'll be interested to hear how these springs work for you, and how they affect track geometry and tension.
Keep up the fine efforts!
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  #143  
Old 02-28-2014, 01:30 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

Thanks. I'll post the mods to the springs in a couple of months. I won't be able to bring the cat back to my shop until late April.
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  #144  
Old 03-03-2014, 10:56 AM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

While at the cabin we got about 6 inches of new powder snow. Before we left I brushed off the windshield and a lot of snow collected between the grill and winch. Didn't think much about it. The defrost vent was still open from the trip up. You can see where this is going. When I started it up, all of the snow that was in front of the grill and that had filtered into the cooling air intake came out of the defrost vent and created an instant blizzard INSIDE the cab. Needles to say that item will now be on the preflight checklist!
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  #145  
Old 03-03-2014, 03:20 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

I don't know why snow vehicles that have a top speed of 10 or 20 mph need to have windshields that lay back for Mach 3 speeds. Here is a machine that we modified thirty years ago. The "Bassackward Sno-Cat" still runs fine and the visibility for the six way blade is great. Clearing the wind shield is not necessary unless there is wind. The wiper does not get much use. Looks ugly, works fine. Easy to load as the pontoons are right where you can see them.
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  #146  
Old 03-03-2014, 04:07 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

the Antarctic snow trac's were also equipped with frost free wind shields a forward sloped windshield would look pretty cool on my 2100 and make getting in and out a lot easier I always seem to get tangled up in the knobs in the overhead console
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  #147  
Old 03-03-2014, 04:57 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

That may be the craziest looking Tucker yet. Can you post up more pics of that and the story behind it?
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  #148  
Old 03-03-2014, 08:42 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

What DAVNET said !
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  #149  
Old 03-03-2014, 09:43 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

no need to turn around in that one. thanks for showing it.
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  #150  
Old 04-21-2014, 05:33 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

I got the new springs for my 1402 IMP today. These are a good 2" taller than the originals and are 1/4" thick rather than 3/16. My cat is heavier than it was stock and one of the original springs had broke. Ground clearance will also be improved. (Stock spring is in front.)
I got them from SD Truck Springs. They were only 21 bucks each. http://www.sdtrucksprings.com/index....roducts_id=331
They would work on the 1400, 1402, and 1404 IMP They come with 9/16" id bushings which have to be replaced with 1/2". I will machine them from 1" delrin plastic.

We just got back from Hawaii on the 15th, on the 16th my computer crashed, and on the 17th I got sick with the flu. What a week! Feeling better now and using an old laptop.

Hope to bring the cat back to the hangar in the next week or so and "Git er done!"
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  #151  
Old 04-21-2014, 06:45 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

So, more or less these should last you a life time, and be just perfect considering the extra weight of the cabs on the cat.

You assuming that you will get another inch of clearance as well? They are higher arched, are they not?

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  #152  
Old 04-21-2014, 07:17 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

I was considering the torsion axle conversion but for my use of my cat this is probably a much more suitable solution. I think I will order these as well when the cab comes off for paint and then these springs will go on as well. please take some before and after measurements and share the height you gain. I would think it would be in the neighborhood of 2".

Thanks for sharing!
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  #153  
Old 04-21-2014, 07:48 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

That's my concern as well... will that small lift give me not enough track?

To be honest.... I haven't even looked at the track adjustment. I'm ASSUMING that the front small idler wheel has a rough adjustment on it.

In my defense.. all of my efforts have been removing my C4. It's headed for rebuild as soon as I get home.

JP
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  #154  
Old 04-21-2014, 08:34 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

looking at them they look like they are going to make for a rough ride. they look like short little trailer springs
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  #155  
Old 04-21-2014, 08:47 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

Quote:
Originally Posted by anthonydoldd View Post
I was considering the torsion axle conversion but for my use of my cat this is probably a much more suitable solution. I think I will order these as well when the cab comes off for paint and then these springs will go on as well. please take some before and after measurements and share the height you gain. I would think it would be in the neighborhood of 2".

Thanks for sharing!
Hi Anthony. The new springs are way stiffer than the stock ones. I may end up taking out the top leaf. We'll see. If you aren't in a hurry to do it, wait and see how mine works out. I should have it done by the end of May. I also have to pull the engine to replace the clutch. I'll take lots of pictures.
It should give a good 2" of increased lift which I could use in the heavy wet stuff we get here sometimes.
When I rebuilt my tracks I went with 55 grousers rather than 54 with the lift in mind. I figured I could always shorten them if necessary. I have a pneumatic idler at max forward position and 50 psi. (It should be 80) It did tend to slip in the turns this winter. A rough trigonometric guess would be that I would have to move the idler back 1" or maybe not at all in my case. Total cost for the springs was about 200 bucks with shipping.
One concern I have is that the higher arch will result in a center distance increase when the spring is depressed, with the posibility that the two center tires could touch. I don't think they will because these springs are way stiffer. We'll know soon.
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  #156  
Old 04-21-2014, 09:19 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

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Originally Posted by Snowtrac Nome View Post
looking at them they look like they are going to make for a rough ride. they look like short little trailer springs
That's pretty much what they are. Compared to the Snotracks and the 1450 (5 1/4" leaves on 10 wheels) the stock 1402 and 1404 springs are WAY light (3 3/16" leaves on 4 wheels) when adjusted for vehicle weight and wheel count. The slight lift will also put more weight on the bogies and off the solid rear sprocket (no suspension) which tends to run on the ground on a 1402 and drop center grouser equiped 1404.

I do know the lighter springs have been known to break. The best way to find out is to try it.
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  #157  
Old 04-22-2014, 01:25 AM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

The post above should read (3 3/16 leaves on 8 wheels)
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  #158  
Old 04-22-2014, 03:07 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

I got the spring bushings machined today. These are made from 1" diameter Delrin. A 3' piece of stock was enough. The eye in the spring is a nominal 7/8" but as you can see, the 9/16 id bushings that came with the springs were made from 7/8 stock and have tape wrapped around them to keep them tight. So the new bushings were machined .890 OD, .500 ID and 1.770 long. They were easily driven into the eye with a hammer, Then reamed with a .501 reamer. Plastic tends to distort when press fit, so the hole was finish reamed after assembly. The axle on the 1402 is a 1/2" bolt.
Not much more I can do till I get it home.
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  #159  
Old 04-24-2014, 10:41 AM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

Jeff, it's inspiring to see such meticulous and well thought-out work. Thank you!
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  #160  
Old 05-14-2014, 12:25 AM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

I got the cat in the hangar this week and partially torn down. The wheels and springs are off. I am going to replace all of the wheel bearings since they were a little rough. Found enough bearings to do all of them on EBay for 50 bucks.

While adjusting the brakes I had quite a surprise. The transaxle on the 1402 is mounted on trunions and can rock side to side. While working on it I pushed down on one side and the left brake line broke in half! Whoa! The last time we drove it to the cabin we were 2 bumps away from having no steering or ability to stop.

The old brake lines were in pretty bad shape so I replaced them with Aeroquip Teflon stainless braided hoses and AN-4 stainless swivel fittings. I machined the inverted flare part of the banjo fitting with a -4 MS porting tool and tapped it for 7/16-20. I used a 90 on the left and a 45 on the right. It should last till I'm dead. Had this not happened in the shop that may have come sooner than I expected. I should have inspected this more closely last year. If you have a 1402 or 1404 with this type brake line I would really suggest you check it very thoroughly. When the transaxle rocks there is a focused bending moment on the small diameter tubing section of the brake line. Eventually it fatigued and broke.
The swivel fittings are much stronger in an application with motion.

After the brakes were done I started the engine and checked the brakes out. I had had a problem with the clutch on the last trip. With the engine running in 4th gear I applied both brakes to try to kill the engine. The wheels stopped and the engine grunted a little but kept running. The clutch is REALLY bad. I think some of the lack of performance was due to the clutch. We're lucky we made it back from the cabin. I have a complete new clutch assembly but the engine has to come out to replace it. I'll try to get going on that this weekend. When that's done I'll get the new springs on and see how the track fits.
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