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Wabco scrapers at work

RZucker

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ok well im learning that this machine is not ready to work as i was hoping elevator runs but week one phase has 100 volt drop will not steer with elevator engaged but will steer fine other wise rectifier been switched to new style have 3 volts at rectifier where i should have like 70 volts the 104 to ground test indicated low voltage as well have a 111a book that im trying to use and learning about using volt meter im in way over my head seems like machine has a lot of potential located north east arkansas if you can help 870 335 5606 Lee
Sounds like several problems to me, need to find out if the weak phase starts at the generator output first, If the stator has a bad phase that can get expensive fast.
I will try to make some time to give you a call tomorrow and give you some ideas of things to check out.
 
Joined
Aug 30, 2019
Messages
9
Location
Smithville Arkansas
ok well im learning that this machine is not ready to work as i was hoping elevator runs but week one phase has 100 volt drop will not steer with elevator engaged but will steer fine other wise rectifier been switched to new style have 3 volts at rectifier where i should have like 70 volts the 104 to ground test indicated low voltage as well have a 111a book that im trying to use and learning about using volt meter im in way over my head seems like machine has a lot of potential located north east arkansas if you can help 870 335 5606 Lee

update im checking at the contact and then comparing to gen out put at generator and in getting same voltage at both places ..... but sometimes i see 230 230 160 ..... and then other times i test i will see like 165 165 165 it will be the same at both places ... im talking to a gentleman that says i need transformers ... any thoughts and does anyone have any ?
 
Joined
Aug 30, 2019
Messages
9
Location
Smithville Arkansas
update im checking at the contact and then comparing to gen out put at generator and in getting same voltage at both places ..... but sometimes i see 230 230 160 ..... and then other times i test i will see like 165 165 165 it will be the same at both places ... im talking to a gentleman that says i need transformers ... any thoughts and does anyone have any ?

another update ,,, looks like generator test good when unhooking transformer and testing gen alone bout 300 volts across all 3 phases
 

DMiller

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Feb 21, 2010
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16,432
Location
Hermann, Missouri
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Cheap "old" Geezer
Transformer could have a intermittent to ground or a failed winding Tap point. Are still a FEW and not sure if any around you electrical shops that will rewind the old ones. Last dry pack I had my hands on was rebuilt in East St Louis IL, they are long gone.
 

RZucker

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Transformer could have a intermittent to ground or a failed winding Tap point. Are still a FEW and not sure if any around you electrical shops that will rewind the old ones. Last dry pack I had my hands on was rebuilt in East St Louis IL, they are long gone.

Talked with the OP this afternoon for awhile and I'm leaning toward a diode failure in the booster rectifier. He says he's not getting any more than 24V DC at the field connections, with a load from an unloaded elevator that should go up to 60, even 80V from the starting surge. He mentioned the rectifier is converted to a diode bridge from the old plate rectifiers, but the bridge is in the old oil tank without cooling oil. Uncooled diodes are no Bueno. Later machines with diodes placed the diodes in the air cleaners for positive cooling. We'll see what he finds next. He's going to use some long leads on the multimeter to check the 3 phase harnesses.
 

weaknees

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May 20, 2008
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107
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NSW, Australia
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Earthmoving Contractor
This thread has been quiet for a while...
I am currently building a dam in Central NSW, using two 222G's. It's the first job since buying them, having some teething troubles but have shifted 50,000 ccm so far, 65,000 ccm to go.
 

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Maurice Muenks

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Aug 30, 2010
Messages
85
Location
Taos, Missouri USA
Occupation
Owner of an independant heavy equiptment repair bu
Uploading woes..
Just curious to on how your scrapers worked for you you on the production side of things. By the looks of the soil you are working with they should have done a good job. My dad had a C-Pull with a handcock scraper with a CPA6A serial number that he bought in 1964. It orginaly had the six teeth on the two middle cutting edge sections. The cutting edge was 4 thirty inch wide by eighteen long cutting edge pieces with the middle two being lower than the two outside ones. In 1970 he came across some new design edges from the Wabco dealer in Kansas City, Mo. USA that were 30 inch wide by 30 long. The dealer recomended he try a set of two for the middle edges and not install the teeth on them. The result was astonishing.
We would start the borrow area or cut at one side and move across the with of the borrow are running the outside of the left tire against the outside of the previous right wheel track until we got all the way across the area. Then we would come back and pick up the ridge that was left from the first time across. What that did was the new cutting edge stuck down about 4 to 5 inches, so when we came back and picked up the ridge we wrer picking up about 8 to 10 inches of dirt and not getting the sides edges in the ground draining horsepower. On the average we could load the scrapers over flowing with 20 yards of material in less than an minute. When the job was by the yard we could make great time. I still have that scraper and when I used it 10 years ago it still would load in under a minute. Once the new style edges were not adaviable any more we would weld worn out edges together so we would get the extended length on the two center ones. One thing in order to load that fast was the not let the RPM's drop lower than 1800 RPM so as not to bog the elevator down. And the another difference is the C-Pull had 2 motors on the elevator.
I was a teenager back then and only got to run a D-Pull which had a stick shift and was always always told STAY OUT OF THE C-Pull BORROW AREA, because picking up the ridges made my little machine load a lot easier. Now I'm 71 years old and just want to pass on any information that I learned from being around heavy equipment for over 60 years. In case you are wondering how that figures out I was running a Cat D-6 9u serial number when I was 10.
Hope this is helpful
Maurice
 

terex herder

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Nov 10, 2017
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1,779
Location
Kansas
I have a parts book, but it just identifies the parts, no mention of capacity. It can't be to large with a 4-71 for an engine. If you are looking to retrofit something current to work be aware it is a 120 hz system.
 
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