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621 open bowl Scraper blown engine

mkosior2988

New Member
Joined
Jan 16, 2023
Messages
3
Location
USA
Hello there,

At the location we are at we have a 621 scraper with a suspected blown engine. It has been deemed that it’s a loss cause of a vehicle and we are just trying to move it from once location to another; however, they supposedly cannot get any power to the equipment to unlock the brakes.

We’re trying to figure out a way to be able to unlock the brakes or are we going to have to take it apart and get a crane involved.

Thanks in advance!
 

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kshansen

Senior Member
Joined
Mar 11, 2012
Messages
11,129
Location
Central New York, USA
Occupation
Retired Mechanic in Stone Quarry
I don’t believe a 621K has air brakes.
Just an idea, have you checked to see if the operators manual is in a pouch behind the operators seal or under it? I know every Cat machine I worked on from back in the 1970's had them from the factory. If we were caught running a machine without the operators manual in it we would be in big trouble from management and MSHA!

I only have access to parts information on SIS but can see that the 621K has the multi-disk wet brakes like other Cat equipment, and they are used as service and parking brakes. Parking would be spring applied and service would be most likely applied by oil pressure from and accumulator.

I'm only guessing that there may be a tool of some kind that would be used to manually release the brakes by compressing the springs. Just a word of caution if you find out how to release the brakes you will have no way to stop the machine.

If you don't know how to move this machine you should leave it to someone who does!

Also if the bowel is down moving it might also be a problem.
 

ahart

Senior Member
Joined
Nov 7, 2020
Messages
808
Location
Indiana
I understand, we’ve got a fleet of B models, F models, a couple Gs and 4 Ks, At least with the hydraulic brakes on the 627K scrapers, you can actually use the brakes. Most of the air brakes are semi functional at best.
 

Nige

Senior Member
Joined
Jun 22, 2011
Messages
28,984
Location
G..G..G..Granville.........!! Fetch your cloth.
I understand, we’ve got a fleet of B models, F models, a couple Gs and 4 Ks, At least with the hydraulic brakes on the 627K scrapers, you can actually use the brakes. Most of the air brakes are semi functional at best.
That pales into insignificance on the older models if you lost a steering pump when that quill drive broke....
Under those circumstances dropping the Big Yellow Brake was pretty much all the operator had left.
 

JD955SC

Senior Member
Joined
Mar 13, 2011
Messages
1,349
Location
The South
I understand, we’ve got a fleet of B models, F models, a couple Gs and 4 Ks, At least with the hydraulic brakes on the 627K scrapers, you can actually use the brakes. Most of the air brakes are semi functional at best.

Growing up around old junk with my Dad I didn’t know construction equipment had brakes from the factory I thought you just dropped the blade for everything slowing and stopping wise lol
 

Pops52

Senior Member
Joined
Jan 19, 2016
Messages
293
Location
Penn Valley, CA
Occupation
Worn out lowbed driver "retired"
Growing up around old junk with my Dad I didn’t know construction equipment had brakes from the factory I thought you just dropped the blade for everything slowing and stopping wise lol
I used to move an outfits Wabco 222s. One had zero brakes and the throttle stuck low at 1000 rpms. It was a joy and exciting to load on the lowbed....
 
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