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Cat 980c wet brakes

J

Johnpenwell

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texas
Can anyone give me an idea on how big of a job changing these brakes are. We have a seal that is leaking by and filling the rear up with hyd. oil. I'd appreciate it if someone has any knowledge thanks in advance.
 
kshansen

kshansen

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Johnpenwell said:
Can anyone give me an idea on how big of a job changing these brakes are. We have a seal that is leaking by and filling the rear up with hyd. oil. I'd appreciate it if someone has any knowledge thanks in advance.
Click to expand...
Any chance of a full S/N to assure you get correct answer?

I did a quick look on SIS and there appear to be at least four different 980C serial number prefixes and who knows how many variations in each of them?
 
J

Johnpenwell

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texas
kshansen said:
Any chance of a full S/N to assure you get correct answer?

I did a quick look on SIS and there appear to be at least four different 980C serial number prefixes and who knows how many variations in each of them?
Click to expand...
I will try to get that information all I know is that it is the later model that has wet brakes.
 
kshansen

kshansen

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I've done that job a few times on a 980G not sure how different a 980 C would be.

Not a bad job on the "G" as long as you have means to lift and support the machine. But also not a job you can do before coffee for sure!

I had a 40 ton overhead crane, lots of blocking, heavy duty jack stands, fork-truck and small floor crane to work with along with other things, so when I say not a bad job you need to see everything is relative!
 
W

wornout wrench

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The C models have outboard brakes.
Been a long time since I did one, and we were lucky, we had a spare brake so would just unbolt and bolt the new one on. Rebuild the core when time.
I don't remember it being any kind of a hard job. The shop manual described the job in detail IIRC.

Once you get the S/N up, one of the other guys can get the information posted. Retirement caught up to me, I am no longer able to access any information, passwords have all been changed or cancelled.
 
kshansen

kshansen

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Bluox said:
980C All 4 serial numbers are the same machine .
Bob
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Ok, did not know that and try to not assume too much especially with Cat equipment!
I'll attach the file on the brake assembly to give an idea of the job. If more information is needed I can supply that too. One trick might be knowing which is the one that is leaking but that can be done with a hand pump. I personally would jump to the conclusion that if one on an axle is leaking the other is going to be following pretty soon!

Also if someone is going to be owning one of these machines a factory manual would be a excellent investment and a full serial number will get you a link to that information for a purchase. And NO! I don't get a nickle from Cat or anyone else for that or I would not have posted the file below that will give you 90% of the information you need to ix this loader!
 

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Nige

Nige

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G..G..G..Granville.........!! Fetch your cloth.
A quick and dirty method of finding which one is leaking is to blank the brake actuation line to one side of the machine, run it for a day or so, and see if the oil level in the axle changes. If the piston seal is leaking it will show up within a few hours as an oil level change.
If I did that I always blanked the other one and repeated the test just in case I'd won the lotto and they were both leaking..........

EDIT: That's not to say I wouldn't want to do both sides, but if only one side was leaking and the machine was required urgently I'd do that side first as a breakdown job then maybe plan to do the other side when the machine was down for a 2000-hr PM.
 
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kshansen

kshansen

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Yes many things one has to consider on a case like this!

First off might be how fast it is leaking. Say if you check oil and find level has gone up to where you drain off two gallons after a 1,000 hours of working that would be one thing. But if you checked level two days ago and now this afternoon you notice oil flowing out the breather on the axle that would be a whole different story!

Or if the oil is leaking so bad the brake pressure warning horn/light comes on while stopping as you pull up to the truck you are loading.
 
kshansen

kshansen

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I see that they are using air over hydraulics as opposed to straight hydraulics like the 980G's I worked on the last few years. But otherwise the wheel end brakes are very much the same.

One bad point of the air over hydraulics is there is a very limited supply of oil to work the brakes and once that is gone so are the brakes to that axle.

At least with the straight hydraulic systems you have a lot more oil to loose before the brakes go away!
 
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