No trim under full throttle
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No trim under full throttle

  1. #1
    BUN
    BUN is offline
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    Default No trim under full throttle

    Need a little help guys. Other than my Nordic, I own a 2004 Glastron GX 235. Its a 23 foot bowrider powered by a 5.7L volvo penta (350 chevy) and has a SX-M outdrive. I am running a 4 blade stainless prop on her now. Here comes the problem! Once i get out of the hole and plane out i can't trim up under full throttle. If i back the throttle back down about three quarters of the way i can trim up. It will trim down under full throttle if i am trimmed up though. Just sitting it trims up and down no porblem. I have bled and filled the trim reservoir and lines, replaced o-rings, and all the fuses and relays for the trim motor/pump. Last year, the trim pump blew the relays and i found out that the quick connects for the trim pump were corroded. To fix this i hardwired the pump in, removing the quick connects and crimping on new connectors and covering in heat shrink and waterproofing. I haven't been able to find anyone that knows how to fix this problem. The last thing i can think of is replacing the trim pump and thats about 700 bucks. Any thoughts?

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  3. #2
    a.k.a. "Mean Pair" Nice Pair's Avatar
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    Quote Originally Posted by BUN View Post
    Need a little help guys. Other than my Nordic, I own a 2004 Glastron GX 235. Its a 23 foot bowrider powered by a 5.7L volvo penta (350 chevy) and has a SX-M outdrive. I am running a 4 blade stainless prop on her now. Here comes the problem! Once i get out of the hole and plane out i can't trim up under full throttle. If i back the throttle back down about three quarters of the way i can trim up. It will trim down under full throttle if i am trimmed up though. Just sitting it trims up and down no porblem. I have bled and filled the trim reservoir and lines, replaced o-rings, and all the fuses and relays for the trim motor/pump. Last year, the trim pump blew the relays and i found out that the quick connects for the trim pump were corroded. To fix this i hardwired the pump in, removing the quick connects and crimping on new connectors and covering in heat shrink and waterproofing. I haven't been able to find anyone that knows how to fix this problem. The last thing i can think of is replacing the trim pump and thats about 700 bucks. Any thoughts?
    Lots of possibilities, Tired motor on pump, low pressure(worn pump gears), low pressure (by-pass valve in pump) loss of working pressure (oil bypassing seals in rams)
    A quality shop or dealer should be able to diagnos this for you. Good luck.



  4. #3
    Bass Lake Dream'n "Flat" foot'n's Avatar
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    Have you checked the wires in the throttle control? Maybe when the throttle handle is in the full forward position it's opened a wire. With the engine off, operate the trim while cycling the throttle (be sure it's throttle only, don't put it in gear without the engine running) from idle to WOT. See if the trim cuts out.
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