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D3B Transmission parts sources?

BushMike

Active Member
Joined
Jan 12, 2026
Messages
33
Location
Western UP
Looking for info on reputable sources for replacement parts for the D3B transmission. If I end up pulling the engine for rebuild, I want to bring the tranny up to snuff at the same time. I think at a minimum, I want to replace all the clutch/disc plates, springs, piston rings and seals. Cant get my local CAT dealer to even return a phone call…..
 

AllDodge

Senior Member
Joined
Apr 2, 2011
Messages
2,582
Location
Kentucky
Looking for info on reputable sources for replacement parts for the D3B transmission. If I end up pulling the engine for rebuild, I want to bring the tranny up to snuff at the same time. I think at a minimum, I want to replace all the clutch/disc plates, springs, piston rings and seals. Cant get my local CAT dealer to even return a phone call…..
That's unusual, maybe call another one nearby
The parts can be looked up, but will need your serial number

Can get a Sis account and look up the parts your self
 

BushMike

Active Member
Joined
Jan 12, 2026
Messages
33
Location
Western UP
Nige,
I do have the original Cat Parts Manual SEBP-1252-02 (Dec 1988) as well as the original CAT factory service manual. I can certainly look up parts online and was hoping to get some feedback on preferred vendors.
 

Welder Dave

Senior Member
Joined
Oct 11, 2014
Messages
18,066
Location
Canada
Is there a problem with the transmission? I'd cut the filter apart and look for contamination before just tearing it apart. I have a 3F/1R in my 931B. The trans. came out with the engine. The shop that rebuilt the engine checked the screen and it was clean with no black flakes. They said that's a good indication the trans. is good. Never had any problems with the transmission. Machine has about 5600 hours on it.
 
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