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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Cat D4 6u Zenith carburetor query

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Laddie1012

11-23-2022 23:58:53




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Hi guys.

I have a Cat D4 6u dozer started with petrol pony ...the Zenith carb is a TC4 model.

I have a problem with the mains jetting setup inside the carburetor float bowl.

There's a 2" long needle about 4mm diameter that is the mix adjustment needle.

At the moment the needle is sitting too high so the mix is way too rich and the pony is smoking and under powered...makes starts difficult. It will turn the diesel over uncompressed but will stall if the decompression is disengaged.

Some TC carburetor have this needle as a direct screw.

Mine has a spring load setup that I can't easily figure out.

The spring is lifting the needle out from the seat.

The mechanism to push down seems to be missing something.
Any ideas? Even bad ones...

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AJ.

11-24-2022 17:26:45




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 Re: Cat D4 6u Zenith carburetor query in reply to Laddie1012, 11-23-2022 23:58:53  
Try the carburettor shop at the link below for a repair kit, I do not know if all the parts you want are in the kit so check before you buy.

AJ

Link



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NIK OWEN

11-24-2022 16:15:21




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 Re: Cat D4 6u Zenith carburetor query in reply to Laddie1012, 11-23-2022 23:58:53  
PUT IT ON SHELF, OR BURY...GET A RIDING MOWER CHINESE CARB, GET MUFFLER SHOP 2 WELD U A 90 DEGREE FLANGE MOUNT...IT WILL ALWAYS WORK, & RITE...BE BLESSED, GRATEFUL, PREPARED...D69U



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dpendzic

11-24-2022 07:55:23




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 Re: Cat D4 6u Zenith carburetor query in reply to Laddie1012, 11-23-2022 23:58:53  
there are two types of main adjusting screws---one is the vertical screw that directly moves the needle up or down and the other is a horizontal screw that pushes on a 90 degree lever which lifts or lowers the needle---the lever often gets bent throwing the adjustmet off



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