 Joined: 14/08/2019(UTC) Posts: 30 Location: North Carolina, Durham
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Hi All, I bought a used Crocodile off eBay and it did not come with a manual. I looked on the Marklin site and it appears that it did not have one originally. The serial number starts off with H00 so I'm assuming that this Croc was manufactured in 2000. It has a parts list at: https://www.maerklin.de/...elnummer=3756&lang=2but the schematic labeled for a 3356. I'm assuming the model number changed but the internals did not. On the underside, there is a 120 degree angled lever. On the above schematic, it is just to the left of the number 33 (to the left of the 3356 label and below the right pantograph). Does anyone know what that lever does and what position it should be in for various functions??? It almost looks like it could be moved to draw power from the pantographs. Any help would be appreciated.
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Joined: 14/08/2019(UTC) Posts: 30 Location: North Carolina, Durham
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 Joined: 01/05/2016(UTC) Posts: 623 Location: Athens
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Hi
The lever is to change between rail and catenary operation.
In my pictures the lever is in the position to take power from the center rail on the rails.
The position in my photos is for the rails feed.
If you post a photo of the loco may be we can tell you witch exactly is.
Regards
Costas
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 1 user liked this useful post by ktsolias
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 Joined: 23/07/2014(UTC) Posts: 8,467 Location: ENGLAND, Didcot
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Originally Posted by: PeterF7  The 3356 has an old style analogue reversing unit. The 3756 is the same mechanically but has a digital decoder instead of the reversing unit.
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1 user liked this useful post by kiwiAlan
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Joined: 14/08/2019(UTC) Posts: 30 Location: North Carolina, Durham
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Hello ktsolias!! Thank you for your quick reply.  Attached is a photo of the switch position. The switch is to the left of the left yellow hand rail and above the prominent rail wheel. It is not easy to spot so I added an arrow where the point is directly on the switch. Is it possible for the switch to be in a "middle" position where it can draw current from both the center rail and the catenary? TIA 
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Joined: 14/08/2019(UTC) Posts: 30 Location: North Carolina, Durham
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Originally Posted by: kiwiAlan Originally Posted by: PeterF7 The 3356 has an old style analogue reversing unit. The 3756 is the same mechanically but has a digital decoder instead of the reversing unit. Also thank you for your quick reply!! It looks like the diagram has the reversing unit as I see parts labeled: Fahrtrichtungsschalter and Schaltschieberfeder for Direction switch and Switch slide spring, respectively. Does the cover have to be removed to change direction on the 3356? The reason I ask is that there appears to be some electronics on the unit just below the "49" in the attached diagram but the switch itself appears to be mechanical:  This looks like a good candidate for a motor/decoder upgrade. Does this affect the value of a Lok when one goes to sell it?
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Joined: 16/02/2004(UTC)
Posts: 15,442
Location: DE-NW
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Originally Posted by: PeterF7 The serial number starts off with H00 so I'm assuming that this Croc was manufactured in 2000. An orange serial number beginning with "H0" actually indicates year 2000. And it shows digital high-efficiency propulsion (37xx or 37xxx ref. number or equivalent loco from a starter set). Märklin number 3756, Koll number 3756.10. See also: https://www.marklin-user...comotive-s-serial-number |
Regards Tom --- "In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS  |
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Joined: 14/08/2019(UTC) Posts: 30 Location: North Carolina, Durham
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Originally Posted by: H0 Originally Posted by: PeterF7 The serial number starts off with H00 so I'm assuming that this Croc was manufactured in 2000. An orange serial number beginning with "H0" actually indicates year 2000. And it shows digital high-efficiency propulsion (37xx or 37xxx ref. number or equivalent loco from a starter set). Märklin number 3756, Koll number 3756.10. See also: https://www.marklin-user...comotive-s-serial-number I was wondering about whether it has a high efficiency propulsion system or not. The 3356 parts diagram shows a 3 - pole motor. This is what came up when I searched on "3756":  You can see the 3756 in the URL window and the 3356 on the parts sheet. Part #26 is a 3-pole motor. Koll's 2019 reference manual lists this Kroc as DIG * (High Performance Drive) which would imply a 5-pole motor and it would go along with what you and your link are indicating. A Lok built in 2000 would likely need to be upgraded at least electronically to take advantage of the newer features. Is it worth it? I see a lot of "yes" votes. BTW, I hope you shampooed your carpet!!! <-- ROFLBTCUTS 
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 Joined: 13/05/2002(UTC) Posts: 676
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Originally Posted by: PeterF7 I was wondering about whether it has a high efficiency propulsion system or not. 3356 (3-pole motor / delta decoder) and 3756 (5-pole / 6090 decoder) were both produced approx. 1994-2004. Both have the 13305 road number as shown in your pic. If you want to be sure about the motor and decoder, you should open it. If not: - The orange H00 serial number proves that it is a 3756 5-pole, unless someone has ripped the motor and decoder - I suppose you have no box, as that would help: a white 3356 box vs. a grey 3756 box - If you test drive and start with full throttle: does it have gradual acceleration/deceleration? If so, it is a 3756 with 6090 decoder, if not, is is either a 3356, or a 3756 with acc/dec turned off. If still in doubt: just open it. You are correct that the download for 3756 in the Märklin database erroneously links to the 3356 sheet. That is just an error and does not tell you anything about your loco. |
*Bart |
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Joined: 01/05/2016(UTC) Posts: 623 Location: Athens
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Is the 3756 from 2000
In the serial No
H = Digital
Orange H00xxxx means 2000
Catalog 2000/01 page 100
Costas
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Joined: 16/02/2004(UTC)
Posts: 15,442
Location: DE-NW
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Originally Posted by: ktsolias H = Digital
Orange H00xxxx means 2000 Orange H0xxxxx means 2000, there is only the last digit of the year in an orange serial number. |
Regards Tom --- "In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS |
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Joined: 14/08/2019(UTC) Posts: 30 Location: North Carolina, Durham
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Hello Bart, ktsolias & H0,
Thank you all for responding so quickly!! it is much appreciated.
To answer your questions and respond to your comments:
The serial number is orange: H003xxxx
The box is gray.
I haven't had a chance yet to run the engine to test it out. While we are "social distancing", the "honey do" list was dusted off...
I'll let you all know sometime in the next few days.
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 Joined: 28/11/2007(UTC) Posts: 8,225 Location: Montreal, QC
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Originally Posted by: PeterF7 Is it possible for the switch to be in a "middle" position where it can draw current from both the center rail and the catenary? No, for the simple reason that you have the option of controlling trains from either the catenary or the track, which enabled separate control of different locomotives on an analog layout and bridging the two would link the two circuits and could damage the respective transformers and potentially result in live output from the plug of the other transformer (if unplugged). Regards Mike C
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Joined: 13/05/2002(UTC) Posts: 676
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Originally Posted by: PeterF7
The serial number is orange: H003xxxx
The box is gray.
No reasonable doubt that you have a 3756 with 5-pole motor and 6090 decoder. If your doubt was just based on the 3356 spare parts sheet that is linked to the 3756 record in the Märklin database - don't worry, that is just a link error. Originally Posted by: PeterF7
This looks like a good candidate for a motor/decoder upgrade. Does this affect the value of a Lok when one goes to sell it?
No need to upgrade a good old 5p/6090 - unless you insist on mfx or sound. There have been so many Croc versions released since 2007 with mfx and sound, that there won't be a huge market for an upgraded 3756 |
*Bart |
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Joined: 14/08/2019(UTC) Posts: 30 Location: North Carolina, Durham
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Originally Posted by: Bart No reasonable doubt that you have a 3756 with 5-pole motor and 6090 decoder. If your doubt was just based on the 3356 spare parts sheet that is linked to the 3756 record in the Märklin database - don't worry, that is just a link error. Originally Posted by: PeterF7
This looks like a good candidate for a motor/decoder upgrade. Does this affect the value of a Lok when one goes to sell it?
No need to upgrade a good old 5p/6090 - unless you insist on mfx or sound. There have been so many Croc versions released since 2007 with mfx and sound, that there won't be a huge market for an upgraded 3756 I sent an email off to customer service noting the error. I assume it will be on the low end of their priority list. I'm not intending that to be a slam but a realistic assessment. They have responded to my prior emails but it took awhile. I won't try to upgrade any time soon. Just enjoy it!! BTW, that's a beautiful blue Kroc you have. What model number is it?
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Joined: 13/05/2002(UTC) Posts: 676
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*Bart |
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