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| Alco Diesel locomotive gear ratios https://www.rypn.org/forums/viewtopic.php?f=1&t=33979 |
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| Author: | Jack A. Siffert [ Mon Oct 08, 2012 5:35 pm ] |
| Post subject: | Alco Diesel locomotive gear ratios |
Does any know what gear ratios (axle)were used on Alco freight and passenger units? Particularly a Canadian RS-18, A C-420 (American built) Canadian built C-424 and Canadian built FPA-4's A list of possible combinations for all Road and Road switchers would be helpful. Any information would be great. Thanks in Advance. |
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| Author: | BSOR Patarak [ Mon Oct 08, 2012 8:29 pm ] |
| Post subject: | Re: Alco Diesel locomotive gear ratios |
I have a Canadian Pacific MLW built RS-18 and C424 that both have 65:18 gearing and an Alco built C420 with 74:18. It is tough to generalize the gearing, as they may have been ordered differently, or modified by a railroad shop at some point in their life. I'd recommend counting the gear(s) on your units in question.... Pat Connors BSOR |
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| Author: | AlcoC420 [ Mon Oct 08, 2012 9:32 pm ] |
| Post subject: | Re: Alco Diesel locomotive gear ratios |
Alco used several gear ratios. I even know of one railroad that used GE wheel sets with the GE gear ratio. 74/18 65mph 65/18 75mph 64/19 80mph 62/21 92mph 60/23 104mph 58/25 117mph Most common is the 74/18 ratio. |
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| Author: | Jack A. Siffert [ Mon Oct 08, 2012 10:20 pm ] |
| Post subject: | Re: Alco Diesel locomotive gear ratios |
Is the 18 tooth pinion the same size on the 2 different ratios? In other words can you use either axle on the same pinion or did they change the base size and tooth profile for each ratio? |
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| Author: | artschwartz [ Tue Oct 09, 2012 12:13 am ] |
| Post subject: | Re: Alco Diesel locomotive gear ratios |
I suspect that the 74:18 gear ratio has a different pinion than the 65:18 ratio. Otherwise, the armature to axle distance would have to be different, a much more complex manufacturing challenge. |
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| Author: | NH0401 [ Tue Oct 09, 2012 8:57 am ] |
| Post subject: | Re: Alco Diesel locomotive gear ratios |
FPA-4's were geared from the factory for 92 mph top speed. All the bull and pinion gears used on Alcos were supplied by GE. They carry a GE P/N in the renewal parts book. 752E8 with 18t pinion are becoming scarce in the RTO market. 74/18 was superceeded by 81/22 ? when the Dash-7's were introduced. DPK |
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