Broken Gimbal Ring
#1
Broken Gimbal Ring
I had a friend of mine ask me to do some work on his boat he brought a mess of parts and asked me to finish installing the drive and motor. He started and ran out of time. It's an alpha one gen 2 and I believe the gimbal ring busted right in half by the limit switch and sender when I trimmed it all the way up. There was a loud bang. I got it apart putting a good used ring on it but I don't want it to happen again. Does anyone have thoughts on what may cause this? I was thinking trim cyls that are too long but it seems the gen 2 cylinders are longer than the gen 1. Any help is greatly appreciated
#4
Registered
Ayuh,.... I'd guess it was cracked before you got it,....
#5
Registered
Every alpha and bravo I have ever had or heard of has run the trim up till the pump overloaded and stopped without breaking anything. I have heard of people remove stuck drives by jamming the top of gimball ring and running g trim up to pop drive loose. There had to be a crack in that ring ahead of time.
#6
Gold Member
Gold Member
You don't disable the trailer switch,,you adjust it so the length of travel stops where you want it on the trim rams,
I believe the max safe trim ram length,,per mercruiser ,,center to center,, on a Bravo1 is 26.4 inches,, not sure on an Alpha drive
I believe the max safe trim ram length,,per mercruiser ,,center to center,, on a Bravo1 is 26.4 inches,, not sure on an Alpha drive
#7
Registered
It is a trim limit sender for use underway. The trailer switch overrides the trim limit. There is no trailer limit switch.you run it up till it stops. It won't break the gimball ring. A method to limit yourself is hit trailer button when drive is all the way down. Start counting. 10 to 15 seconds usually till it stops. Then stop a second or 2 before pump stops. As long as trim gauge works. With no trim gauge, hearing pump stop is the only way you are sure drive went up enough to drive up the ramp...
#8
Registered
It is a trim limit sender for use underway. The trailer switch overrides the trim limit. There is no trailer limit switch.you run it up till it stops. It won't break the gimball ring. A method to limit yourself is hit trailer button when drive is all the way down. Start counting. 10 to 15 seconds usually till it stops. Then stop a second or 2 before pump stops. As long as trim gauge works. With no trim gauge, hearing pump stop is the only way you are sure drive went up enough to drive up the ramp...
That way, next time ya wanta go boatin', it'll run the drive down, without havin' a "Heavy" friend jumpin' on the drive to break free the stuck valves in the pump,...
#9
Registered
iTrader: (1)
The cylinders should not go up far enough to make contact and this to happen so my first thought; are the cylinders for a Gen 2 or a Bravo?
Can also install spaces in the cylinders to limit the travel, but this is normally only used when the drive will make contact with the swim platform
Can also install spaces in the cylinders to limit the travel, but this is normally only used when the drive will make contact with the swim platform
#10
Banned
iTrader: (9)
The trim limit switch has nothing to do with breaking the GB ring period.
Wrong parts in the assembly is most likely the problem. which gimbal ring are you installing ? gen 1 alpha or gen 2 alpha gimbal ring what application do you have gen 1 or gen 2 alpha and yes trim cylinders are different from alpha gen 1 to gen 2. Just saying not to beat you up --- but prob wrong parts used in the install and prob wrong install procedures.
Have to ask do you have the correct service manual for your app ? that's were I would start and then make sure you have all the correct parts to install per your app.
Proper torque on the hinge pins ? Would look at that also
Wrong parts in the assembly is most likely the problem. which gimbal ring are you installing ? gen 1 alpha or gen 2 alpha gimbal ring what application do you have gen 1 or gen 2 alpha and yes trim cylinders are different from alpha gen 1 to gen 2. Just saying not to beat you up --- but prob wrong parts used in the install and prob wrong install procedures.
Have to ask do you have the correct service manual for your app ? that's were I would start and then make sure you have all the correct parts to install per your app.
Proper torque on the hinge pins ? Would look at that also
Last edited by BUP; 08-03-2017 at 09:40 AM.