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TerraTrac 800-C trouble

P

PNW_Crawler

New User
Hello everyone.
I am looking at a late 50's Terratrac 800-C dozer. I am not familiar with this machine. This particular one has a track the stopped working. I've read that some of these have brake bands that control power distribution to the track an others have a pinion and planetary gear set.
How difficult is it to access and repair these issues? I am mechanically inclined and have ample tools.

Realistically trying to determine if it's worth the price and time to repair the machine or just keep looking for another crawler.
Than you.
 
Thanks for the link to the manual, WilBury. Yeah, the machine is definitely beastly! It looks quite impressive. It's not a D6 or anything, but seems adequate for some knock down/drag out work in my small forest.

I'd really like to know what I'm getting into *before* I buy it.
thx!
 
The 800 dose not have brake bands.
It uses a Hyd. brake system that activates either drum/shoe
Brakes, or later SN# models used a dry disc/plate assembly on
The front of the trans.

Either one also use a clutch cutout valve inside the main control
Valve on top of the trans.
So what happens is when a L or R pedal is applied fluid run to the brake and the valve.

I've seen some that had bad master Cyl. and would keep Pressure on the valve resulting in a neutral condition.

Also could be valve or spool problem in the valve body.

Worse case would be burnt or wore out clutch packs on that side.

Make sure the HI/Low lever is not in neutral for that side.

That transmission set up takes getting used to as it was way different than other crawlers.
It's basically a automotive type Auto Trans, with Hyd. clutch packs.

Most parts are hard to find and NLA.
Tom
 
Hi Tom,

Thank you for the reply and sorry for my delayed response.
So, the seller got the track working again, but says now the left brake doesn't engage. The machine runs, but the left brake won't work.

I understand your explanation of the hydraulic pressure actuating the brakes (I think)
I need to go look at some exploded views again.
So, the crankshaft attaches to a dry clutch (like my truck), then into a auto trans (like a C6) and power transmits L/R to the tracks?
The tracks are braked by hydraulic pressure from presumably an engine driven auxiliary pump?
A master cylinder piston that no longer seals against the bore would make perfect sense in that the fluid is there, but just pushes past the piston seal and never increases to engage the track brake mechanism.

Aside from that, can you think of anything else that would cause the left brake to fail to operate?

Many thanks again!
-Ryan
 
The trans valve contains a clutch cutout piston that is moved by brake pedal application so you are not trying to turn against track power, if the brake systen does not completely release its pressure the clutch disconnect does not return to the drive position, it has a torque converter, not a dry clutch and has a disk brake for each side. The machine should be driven and worked using the Hi/LO speeds in each track for turning, the brakes are not designed for long term turning, occasionally it is ok but there is so much of an advantage to both tracks being powered during a turn that turning with the brakes is undesirable. I know many Case crawlers (same basic transmission, as Case bought Terratrac) that the foot brakes have not worked in years. I have been retired for a few years now and I know parts are drying up but I would check with a Case dealer, most have the Terratrac info.

This post was edited by mEl on 05/04/2022 at 06:12 am.
 
Will the machine move straight ahead with no load or is the track locked up, if it is check that side final drive for metal as they were prone to knock the odd final out, its highly unlikely that more than one clutch would fail at a time, establish whether its lost drive or locked up.
AJ
 
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