Trouble shooting New Suzuki 9.9 High trust trim issue?

[Tony Fox]

While helping a friend break in a new Suzuki 9.9 high thrust yesterday we encountered a strange issue. Out of water the trim/tilt unit worked great(full range/no sound). While motoring in the water it would not trim out above 1/2 throttle. We would slow it down and then try and it worked that way no problem. We then trimmed out and sped up to above half throttle and trimmed it in and there is a terrible screeching whine. It is mounted on a Thunder Jet offshore bracket kicker plate so I thought that maybe the terrible sound might be harmonic resonance, but that was just too pronounced. There was still the issue of the lack of ability to trim out above 1/2 throttle. It was shipped here New in box, we added Engine oil and checked the lower unit oil and it did have lower unit oil in it. Is there a chance that it ships without trim unit oil? Are we maybe overlooking something simple? Any assistance prior to taking the whole boat in to the shop would be greatly appreciated. Thank you in advance, Tony PDX

[Stu. Ozi Skeeter]

HI Tony.
I have not seen a 9.9 with trim or tilt here in Australia , we have only just got the DF 9.9 Fourstroke.
I would check the oil for tilt and trim , it may be low and or have air in it and maybe cavitating ,it may need to be bleed out.
It may not have enough hydrualic presure to counter act the thrust force of the engine at high rpm.

Stu.

[Tony Fox]

Hey thanks for responding mate. I have figured it out . It is actually not a Trim/Tilt unit. It was designed for tilt only basically limitiing the strength of the hydraulic unit. With the high thrust of the 9.9 at higher speeds , It was just too much on the unit. Perhaps if the boat was just a little rower it might not have that issue. While using it as a AUX. it was just hurtin it. Thank you again for taking the time. Cheers, Tony Portland, OR.

[Stu. Ozi Skeeter]

Thanks Tony.
I was sort of on the right track .
Good to see its all sorted out.


Stu.