Reverse lock valve

dozerII

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Oct 25, 2009
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Got a couple questions for the Pro's, I have a 1976 Mercruiser 120 motor #4479938, drive 4525102 and transom 572104
The trim pump was replaced by a P/O to the one in the pictures. Olydine.







First question is, with this pump do I need to use the reverse lock valve? I just did a complete rebuild on the boat and replaced all the hydraulic lines with high pressure.

If I don't need the reverse lock valve, big if, do I just join the two hoses that attach to the RLV? And do I just run the shift cables as they were to an inoperative valve?

Thanks in advance for ay help.
 

Bondo

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Apr 17, 2002
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70,958
Re: Reverse lock valve

Ayuh,.... That pump just needs two lines run straight to the hyd. manifold under the transom housin',....

Delete/ ignore the reverse valve,...
 

dozerII

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Re: Reverse lock valve

Ayuh,.... That pump just needs two lines run straight to the hyd. manifold under the transom housin',....

Delete/ ignore the reverse valve,...

Your the man Bondo,Thanks, so I just run the shift cables the way they were on the RLV?
 

dozerII

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Re: Reverse lock valve

One more question on this system, the P/O was running 10/30 in it I cleaned it our and refilled it with the same, is this acceptable or should I flush it and fill with ATF?

Thanks
 

Bondo

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Re: Reverse lock valve

One more question on this system, the P/O was running 10/30 in it I cleaned it our and refilled it with the same, is this acceptable or should I flush it and fill with ATF?

Thanks

Ayuh,... Yer choice,... Merc has recommended both over the years,...
 

fishrdan

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Jan 25, 2008
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Re: Reverse lock valve

I did that conversion and Bondo is spot-on, just by-pass the RLV while leaving the shift cables connected to it.

One thing though, I filled the RLV with oil and capped it off, so the pivot of the assembly wasn't running dry while shifting.
 

dozerII

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Oct 25, 2009
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6,527
Re: Reverse lock valve

I did that conversion and Bondo is spot-on, just by-pass the RLV while leaving the shift cables connected to it.

One thing though, I filled the RLV with oil and capped it off, so the pivot of the assembly wasn't running dry while shifting.

Thanks for the info.
 
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