Koehring 2N Crane-Shovel Crawler Mtd. USMC

Koehring 2N Crane-Shovel Crawler Mtd. USMC The story of finding and restoring a 1968 2N Koehring Crawler Crane, 12-1/2 ton capacity, in northern CA. Stories and photos of other 2N crawler cranes welcome.

Update on the 2N. I have been slowly going over the crane, lubing, freeing up tight joints, adjusting the frictions and ...
02/01/2025

Update on the 2N. I have been slowly going over the crane, lubing, freeing up tight joints, adjusting the frictions and brakes. All has gone well until I tried to work the jaw clutch for the "sprag disconnect". I tried applying PB Blaster, heat and beat, to the triangular bell crank/interlock but it would not pivot. Out comes the smoke wrench, and I burned off the two mounting bolts for pivot mount, and removed the whole assembly. Now working from a vise, more heat and beat was applied, and the pivot came loose. I earlier mentioned the inter lock feature that this assembly is part of. The purpose of the interlock is a safety between the boom sprag disconnect and the the boom dog. The sprag clutch cannot be disconnected unless the boom hoist dog is engaged, and vis versa, the boom hoist dog cannot be released unless the boom sprag clutch is engaged. This is to prevent a "Live boom" situation. You can bypass this interlock, but it is not advised. The reason for the sprag clutch disconnect is so the draw-works can be run backwards. The problem with running the draw-works backwards is the boom hoist sprag will catch, and if the load is heavy enough, you will start "booming up". If you have a load on the hook, and you want it to come down thru the brake slowly you can do the following. The load is hanging in the air, engage the hoist friction. Disconnect the master clutch, engage the boom hoist dog, disconnect the sprag clutch. Now you can ease off the hoist brake, and the hoist drum will turn the draw-works for a controlled load lowering. When I get the bell crank installed, I will update with more photos. One thing about this crane is you have to have an assortment of shortened/bent/modified wrenches to work on them.

Parts is Parts. The 2N I accuired I had to knock out 20' of boom extentions for the move. Today I made a trip to the Hil...
08/24/2024

Parts is Parts. The 2N I accuired I had to knock out 20' of boom extentions for the move. Today I made a trip to the Hillside of abondonment to reteive the 20' section, plus two more tip sections, one butt section with a tagline winder, and two 5' extentions. Interesting note one of the 5' sections has the factory tag for what machine it was built for, which is the 2N. The tag installer messed up and installed a tag for a 10' extention not the 5' that it is. I also recovered the two overhaul weights, and a 12 ton 4 part block. The next trip I will pickup a clamshell, a dragline bucket, and a spare engine/TC unit.

It finally happend today. Loaded the mighty 2N from its hillside grave of abandonment, to a good home with a shop, and l...
08/20/2024

It finally happend today. Loaded the mighty 2N from its hillside grave of abandonment, to a good home with a shop, and light useage. Thanks to the driver Seth, from Canyon Rock, for a great job on the move.

So a little history of Me and 2N cranes. I am a crane operator for Power Engineering based in Alameda, CA. I operate th...
05/30/2024

So a little history of Me and 2N cranes. I am a crane operator for Power Engineering based in Alameda, CA. I operate the 250 ton derrick barge DB Pacific, in the SF bay. Previously working for Cooper Crane of Novato CA, I started as the transport operator, then assistant mechanic, then Lead mechanic. At Cooper Crane I was first introduced to a Koehring 2N crawler crane by transporting it from job to job. After becoming one of the mechanics, I starting working on, and operating it. In the late 2000's California's CARB demanded that heavy epuipment engines be upgraded to CARB compliance. The Koehring 2N was the first crane at Cooper Crane to recieve this compliance upgrade. I removed the stock 3-71 Detroit diesel engine, and retrofitted a Cummins 4BT. Fast forward to July 2023. I started at a new jobsite for Power Engineering at Chevron Point Orient pier removal. To get to the DB Pacific, that was on anchors at Pt Orient, we had to get on work boats at Pt San Pablo Yacht Harbor, and go by water out to the barge each day. On my way to work I noticed a small crawler crane resting in the brush just off the road down into the yacht harbor. I was pretty sure it was a 2N just like the one at Cooper Crane. I would have to check this out after work. After work the yard foreman at the yacht harbor asked if I was a diesel mechanic, and if I could look at their 40 ton Hass excavator that they could not start. I said ok, and by the way, what is the story on the crawler crane? He said "If you can get the Hass running, you can have the crane". What? Yes that was he said. Intrigued by that, I had to see the crane more. Crashing through 100 feet of Scotch Broom brush, I finally made it to the crane. It was indeed a Koehing 2N crawler crane, just like the one at Cooper Crane, but in much better condition. First step, clear a path to, and around the crane. To be continued

05/30/2024

The story of finding and restoring a 1968 2N Koehring Crawler Crane, 12-1/2 ton capacity, in northern CA. Stories and photos of other 2N crawler cranes welcome.

Here is another 2N unit. Not sure where, or when, the photo was taken.
05/27/2024

Here is another 2N unit. Not sure where, or when, the photo was taken.

Looking around Google, I found this 2N. A qoute from the information on the photo as follows. "a USMC koehring model2N M...
05/27/2024

Looking around Google, I found this 2N. A qoute from the information on the photo as follows. "a USMC koehring model
2N M66 with 315 hours on the meter. 3-71 detroit with an allison torque." This crane was in Eastern Oregon About April 2010.

First photos for walkaround accessment. After cutting down the thick brush around the crane, I was able to take these p...
05/26/2024

First photos for walkaround accessment. After cutting down the thick brush around the crane, I was able to take these photos. The crane is really good condition, with minimal rust. The track were like new. There is still paint on the drum lagging. No wear on the fairlead rollers. A first glace going thur the cab, I thought the hour meter said 3007 Hrs. After getting home, and reviewing the photos, I realized the hour meter said 300.7 hrs!!! That explained the lack of wear signs.

This is the story of a Koehring 2N Crawler crane I found in Northern CA in July 2023. The crane was sitting abandon on a...
05/26/2024

This is the story of a Koehring 2N Crawler crane I found in Northern CA in July 2023. The crane was sitting abandon on a hillside at San Pablo Yacht Harbor.

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Rohnert Park, CA
94928

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