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Old 03-08-2016, 09:52 PM   #1
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What gears you got?

Ok, let's see where this goes...

More threads on here about toilet paper than transmissions...

ZF?
Hurth?
Paragon?
Velvet Drive?
Capitol Marine?

In line, drop center, Vee?

What is your engine, transmission combo and what don't you like about the gears?
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Old 03-08-2016, 09:54 PM   #2
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Velvet drive CR2's behind my Lehman 135's. These are drop center, my particular model has the output shaft about 1.5 inches lower than the input shaft. There's really nothing I don't like about them. They're very reliable behind the Lehmans.

Ken
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Old 03-08-2016, 09:58 PM   #3
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"More threads on here about toilet paper than transmissions..." Very funny, but unfortunately very true!

Boat still in design phase:
- Dong I gear
- Agco Sisu prime mover

However, just happened across the fuel/load curves for a typical 40 yr old Gardner. They are more fuel efficient than our brand-new microcomputer controlled high-tech iron! Damn. Now it's got me second guessing my decision....
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Old 03-08-2016, 10:15 PM   #4
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ZF 280-1A
Center drop with 7 degree down angle
2.476:1
John Deere 4045TFM75 135 HP

Only complaint is that you can't get the 7 degree down angle in 3:1 ratio (available without down angle).
Many of the slower trawlers would benefit from 3.5:1 or 4:1 gears. The RPM of engines has steadily increased in the last 15 years but transmission ratios haven't kept up. A 3.5:1 would have been perfect for my setup allowing me to use a standard (28x28) prop.

Ted
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Old 03-08-2016, 10:39 PM   #5
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Volvo-Penta diesel with a volvo branded MS15A 8 degree down angle 2.63:1 trans. The trans appears to be a ZF15MA that has been painted green.
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Old 03-08-2016, 10:41 PM   #6
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Twin Disc 521
Reduction 3.034 to 1
Drop centre
Behind a Caterpillar D353 turbo, 390 hp @ 1225rpm

Good combo, just don't want to ever need to pick it up.

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Old 03-08-2016, 10:53 PM   #7
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Forward and Backward?

Only kidding, ZF 2.91:1 behind JD 6068 TFMs. I do the regular maintenance and really don't them much thought, so they must be doing OK.
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Old 03-08-2016, 10:54 PM   #8
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I've got VD.

More often I call my gear a BW. 2.57-1
I love the smooth and quiet shifting.
My VD has a much reduced (in size (width of gear)) for the hydraulic pump so the pump consumes less power ... probably 1.5 - 2hp. Also the clutch friction material is softer and contributes to the smoothness. These modifications were suggested by the gear rebuilder in view of the fact that the BW gear is set up to work w engines w more than five times as much power. I don't know how often this is done but I'm very happy w the gear.

The engine turns 3000rpm at wot and 2300 at cruise. A conventional 1 1/4" SS shaft is terminated w an 18" dia bronze prop and coupled to the gear via an R&D flexible coupling. There is an oil cooler and I use ATF lube oil.
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Old 03-08-2016, 11:00 PM   #9
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ZF 280PL 1.514:1 behind Cummins 6CTA 450. Not a down angle, but drop center.

No issues with gear in 2300hrs since new in 2004.
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Old 03-08-2016, 11:22 PM   #10
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Makobuilders.
The Gardner engines were brilliant engines, the only problem with them is that they smoke on start up until warm. If you get a good one they will last out your lifetime in a boat.
They made a 3,4,6, and 8 cylinder versions.
The 8 cylinder originally had a problem cooling the last 2 cylinders but a larger water pump fixed that.
Amazing really, they pioneered slow revving high torque and along came the Swedes with turbo high revving 3,000 rpm engines and took over the truck market, now they are all going back to Gardners 1950 rpm format.
Keep checking eBay in the UK, spares are still being made.
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Old 03-09-2016, 12:12 AM   #11
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Twin Disc MG 506, 2.96:1.

Older units, so no capacity for starter lock-out when in gear
No accessory take off, or trolling valve.

Notwithstanding the above they are still great gears
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Old 03-09-2016, 12:30 AM   #12
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Quote:
Originally Posted by Ted View Post
Twin Disc 521

Reduction 3.034 to 1

Drop centre

Behind a Caterpillar D353 turbo, 390 hp @ 1225rpm



Good combo, just don't want to ever need to pick it up.



Ted

Nice!


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Old 03-09-2016, 12:51 AM   #13
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D353T and TD521... Now that is some real machinery!!!

Kudos!!
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Old 03-09-2016, 01:26 AM   #14
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I would kill for a 6 cyl Gardner. Once you buy one, you have to polish them and once you've done that you need to take it out of your boat and put it in your living room, next to the 1970 Bonneville and the BSA Gold Star.

Oh right, rusty Twin Disc. Bulletproof.
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Old 03-09-2016, 01:28 AM   #15
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Quote:
Originally Posted by Insequent View Post
Twin Disc MG 506, 2.96:1.

Older units, so no capacity for starter lock-out when in gear
No accessory take off, or trolling valve.

Notwithstanding the above they are still great gears
+1

That's what I have too.
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Old 03-09-2016, 06:22 AM   #16
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Lehman 120, with Paragon box (am I the only one), with forwards and backwards, (who needs more?) and there's nothing to not love about them both.

And WTF is a drop centre FGS..?
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Old 03-09-2016, 07:31 AM   #17
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Deere 6090 main with ZF W325 drop center.

Deere 4045 wing with ZF 63-IV vee-drive
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Old 03-09-2016, 07:41 AM   #18
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And WTF is a drop centre FGS..?
Drop center refers to the output shaft being below the input shaft. The alternative is the two shafts being inline (at the same level).

Ted
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Old 03-09-2016, 08:10 AM   #19
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ZF, model 220 ratio 2.47 - 1
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Old 03-09-2016, 08:52 AM   #20
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Makobuilders.
The Gardner engines were brilliant engines, the only problem with them is that they smoke on start up until warm. If you get a good one they will last out your lifetime in a boat.
They made a 3,4,6, and 8 cylinder versions.
The 8 cylinder originally had a problem cooling the last 2 cylinders but a larger water pump fixed that.
Amazing really, they pioneered slow revving high torque and along came the Swedes with turbo high revving 3,000 rpm engines and took over the truck market, now they are all going back to Gardners 1950 rpm format.
Keep checking eBay in the UK, spares are still being made.
They made as well 5 cylinders version.
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