[C38] 5424 Transmission model

[Tom T.]

As a side note, transmissions and differentials will use a gear ratio that will not be an even ratio so that the gears will always mesh with a different position on each revolution.  This makes the gears wear evenly instead of possibly some gears wearing more than others and then causing a hum or vibration.  With an even ratio, any gear with a flaw would keep hammering that flaw into the same spot on the opposing gear.  With an odd ratio, the flaw will hit every tooth on the opposing gear making even wear.

On a differential, the pinion gear will never have a number of teeth that will evenly divide into the number of ring gear teeth.  Transmission gears work on the same logic.  When a transmission is referred to as a "2-1" ratio, they are using round numbers and are not using literal numbers.   A 1.85-1 could easily be called a "2-1" ratio for simplicity, even if incorrect.

Tom T.
Renata hull # 95
St. Pete, Fla  


----- Original Message ----- 
From: John Erlandson 
To: Catalina 38 Listserve
Sent: 5/2/2007 1:47:40 PM 
Subject: Re: [C38] 5424 Transmission model


I replaced my transmission a couple of years ago. It had a HBW100 and I replaced it with a ZF10M which is the updated model # I will have to check what the gear ratio was.
John-

----- Original Message ----- 
From: Max Soto 
To: Catalina 38 Listserve 
Sent: Friday, April 20, 2007 4:37 PM
Subject: [C38] 5424 Transmission model




Hi everybody, 

The list has been very quiet lately!!

I'm planning to pull out my transmission this weekend. Im going to try to rebuilt it.
The tag is gone so I'm not sure which model is it. I have a 1982 24hp Universal 5424 with a HURTH tranmission.
The manual says is a HBW 10, but I heard that is really a HBW 100.

Do any of you guys with this engines know the right model??
I know the ratio is supposed to be 2:1, but is really 1.85:1. I'm I right??

I'll appreciate your help.

Max Soto
C38 #198 Estancia 
Puntarenas, Costa Rica

 



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