Twin Disc MG5075

[Lawrence Ross]

Need Help with what type of Torsional coupler to use with twin disc mg 5072 with a Cummings 480 ce in a motor yacht
Mine is going bad and i am trying to decide what to replace it with a centa or a vulkan type
I have 5,000 hours on the original 2005 unit now i do not know what is in there have not opened it up from the information i have gotten is looks like it maybe a centa cx109a??
Thanks all
Larry

Topic

[Lawrence Ross]

Twin Disc MG 5075 Torsional Coupling

Thanks Tony will do no damage just bad rubber blocks on the non pressure side wounder what they did? the pressure side rubber is very hard will call Centra on Monday

[Tony Athens]

Centa CF-DS Coupling

If there is zero damage to any of the aluminum /metal parts, your best option is to send the unit to Centa to have it rebuilt– Typically Under $500.. A new unit is available, but it’s over $1500.

FYI–None of them will last “forever”.. 5000 hours is above average.

Tony

[Lawrence Ross]

Twin Disc MG 5075 Torsional Coupling

Tony got it all apart attached are the pictures hope this helps

[Lawrence Ross]

Twin Disc MG 5075 Torsional Coupling

Tony got it apart enoff to get some numbers CENTRA ANTRIEBE D-42755HAAN the D might be O hard to see also CF-DS-45 SAE 11 1/2 0249 00
Hope this helps looks like the rubber bushing are all that it needs 8 black and 8 Brownish softer ones only had a small piece left of one also looks like 4 blue ones in the center are they available?

Question the siper part that is on the transmission output shaft will not come off is it just rusted on the splines
or is it pressed on if i could get that off i could get the rest out

took some pictures will post some

Thanks Larry

[Lawrence Ross]

Twin Disc MG 5075 Torsional Coupling

Thanks Tony
After cleaning the starboard tag and looking at the original survey from 2006 the Number on the survey is 5JA847 it might be 5JP 847 very hard to tell it is done by a hand engraver
the serial number is correct S14299
i would probley go with the Survey number as it most likely cleaner then only one year old
let me know if this works
Larry

[Tony Athens]

Twin Disc MG 5075 Torsional Coupling

This just came back from Twin Disc.. I am think you gave me a bad number?

MG5075

BOM S12671 Serial # 5JK897 – Serial number matched BOM.

BOM S14299 Serial # 5JK847 – Serial number does not match BOM. S/N 5JK847 refers to BOM S8875 which is a MG5061A

Lets double check the data tag..

Tony

[Tony Athens]

Twin Disc MG 5075 Torsional Coupling

Room needed to R&R the coupling–You might get lucky with 5 inches??

I just dropped a note to Twin Disc–let’s see what & when they come back to me.

Tony

[Lawrence Ross]

what coupling

Tony Thanks fro the fast reply Port Trany BOM S12671 Serial # 5JK897
Starboard Trany BOM S14299 Serial # 5JK847
Both are 2.53 Ratios
Hope this helps
Can you tell me how much clearance I would need moving the trany back or engine forward to seek in between to get the coupler unbolted with out having to remove anything from the boat engine room is a bit tight. looks like I could get about 4-6 inches space with out tooo much work
Thanks
I guess I know what I am doing fro Labor day weekend this Year

Larry

[Tony Athens]

What MG5075 coupling

Larry,

On your data tag you have a BOM.. Post the number and that will give me a start to whether I can get you an answer………………..Unfortunately, there are not less than 3 possibilities for that gear and Twin Disc records are less than perfect that way..

If you take it apart and post pics of both sides, then life is easy for me to tell you what you need…

Tony

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