Bravo 1 won't trim under power
 

Hello,
I have a new-to-me 97 Crownline 210ccr with a 454 MPI and Bravo 1 drive. The issue I am having is the drive will not trim up when under heavy throttle. In all other instances the trim/trailer trim all work as they should. I can trim up the drive at speed but only if I throttle down first. I can trim down at any speed/throttle position. Any suggestions? Thanks in advance!

David

I am having the exact same issues? Anyone know what might be going on? Pumps and drives trim flawlessly on land, all new wiring everywhere, nothing undersized that I know of.

The boat will be going to the dealer next week so I hope they figure it out. I will post the results.

There is a high and a low preasure side to the pump. The up is a higher preasure then the down. I wonder if they have the hydrolic lines reversed? This would allow it to work while not under load but once the drives are pushing the boat they would not have enough preausre.

Weak trim pump. Had the same issue on my old formula. Only way to get drive to trim up while underway was to pull that engines throttle back, trim up, then reapply throttle! Replaced pump and all was good. Doesn't take much pressure to raise the drive when not loaded, but when moving forward the thrust was too much and the pump couldn't overcome it.

Does the drive drop down by itself when it is trimmed up and then parked for few days?????

If so, it probably has a bad seal or valve in the pump.

I had this happen once I had my lines reversed switched them problem fixed.

BINGO

Thanks AUDIOFN for the tip. I will try that! That makes sense as the previous owner said the pump was new.

David

I tried switching the lines at the pump and I was optimistic as the lines were reversed (at least the colors were) according the the service manual. After switching the lines I could not get the drive to trim up at all. I thought I would bleed the lines and disconnected the starboard side up hose at the trim cylinder and hit the trim up. Only a few drops of fluid came out of the line. I then disconnected the port side up hose at the trim cylinder so both sides were open and it was the same story when trim up is pushed its just a couple drops of fluid. After about 15 seconds running the trim up, the fluid began to foam and bubble up through the vent in the reservoir cap.

Does this information provide a clue as to what the problem might be or just complicate it? Any help would be appreciated.

David

When You Switch The Lines It Will Work Back Wards Down Is Up ,,Up Is Down ,,,You Would Have To Change The Two Solenoid Trigger Wires Too ,,,

When you trim up the blue wires should see power. When down the green wires should see power. The wires that need to see power should be the large ones at the pump. Then the selenoids trigger wires have to match.

Lets get this wiring and plumbing figured out first.

As for the fluid foaming I would check at the pump for fluid then work my way out. Make sure you have the correct fluid in there. Some pumps say to use ATF others motor oil. If the fluid gets low then it will do that. The other thing that I saw do that is bad rams. Take your rams off your drive but leave them on the transom assembly. Then see if you can rotate the end both clockwise and counter clockwise by hand. If it is really hard or you need to put a pry bar in there your rams need to be rebuilt or replaced.

Good luck and let us know what you find.

Jon

The hydraulic lines and wires were reversed as was suggested. The fluid was also replaced. This seems to have solved the problem as the trim up was able to snap a 2,000 lb strap. The actual sea test will have to wait till next season. The work was completed at the shop the same time as Winterization.

Thanks to all that supplied their input on this.

David