Bravo XR drive breakage
Taking a survey as to what you have personally had happen to your XR drive if it broke.
I need to know what failed first, not the other parts it took out in the process. I am working on an improved upper gear set and also think the lowers are an issue for some as well. Thx |
The lowers seem to last longer then the uppers by a pretty good margin, you'll twist a prop shaft off before you loose the gears. I think in the upper the case is the problem though, not so much the gear set. Once you get any kind of HP and the case starts to deflect it game over for any gear set.
In mine i scrubbed teeth off the upper gear set on the left hand drive. Also noticed the top cap bolts were finger tight leading me to believe they had stretched and lost tolerance. Didne really take anything else out but the gear. |
On the boats I deal with,,,,, I would say about 3 to 1 uppers to lowers
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Your poll is wrong. :lolhit:
Should be: Broke XR Upper gears 1 time Broke XR Upper gears 5 times Broke XR Upper gears more than 10 times |
I dont know about you guys, but Merc never should have done away with the TRS drives........ Of course they would have never made millions selling replacement equipment for the bravo drives------ like hooking up twigs to a tractor motor and expecting them to last....
Jim |
imo,3 problems with xr uppers,1 the cases flex,gear contact pattern changes and then the teeth break.2,due to the physical size of the gears,it can only handel app 500 hp.3,the quality of material used in the gearsets is horable,no wonder they fail.
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Originally Posted by cigboat1
(Post 3834991)
I dont know about you guys, but Merc never should have done away with the TRS drives........ Of course they would have never made millions selling replacement equipment for the bravo drives------ like hooking up twigs to a tractor motor and expecting them to last....
Jim I agree would have loved to see a second generation TRS type drive. Simple robust drive with a solid trans for six to eight hundred hp range . . . . or in other words Konrad :D |
Originally Posted by cigboat1
(Post 3834991)
I dont know about you guys, but Merc never should have done away with the TRS drives........ Of course they would have never made millions selling replacement equipment for the bravo drives------ like hooking up twigs to a tractor motor and expecting them to last....
Jim |
Only have had 1 of my lower sets go and 1 lower set
on a friends boat...have a pile of uppers tho. |
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