Construction and other equipment

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excavator

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=37739
Printed Date: 02 May 2025 at 7:21pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: excavator

Posted By: farmer0_1
Subject: excavator
Date Posted: 22 Sep 2011 at 2:53pm

looking for some input on a cat 312 trackhoe. it doesn't have a thumb under 4000 hours i notice that the prices on these series is low compared to other breeds. are they junk? http://www.machinerytrader.com/listingsdetail/detail.aspx?OHID=7717323& hope this is not improper to post this way. i would like to buy and i am looking for issues.

Replies:

Posted By: Coke-in-MN
Date Posted: 22 Sep 2011 at 3:31pm

The Caterpillar 312 hydraulic excavator was introduced in 1992 in Japan and France.

The 312 has a Cat 3054 http://www.ritchiewiki.com/wiki/index.php/Turbocharger - turbocharged , http://www.ritchiewiki.com/wiki/index.php/diesel_engine - diesel engine producing 84 flywheel http://www.ritchiewiki.com/wiki/index.php/horsepower - horsepower (FWHP). It comes standard with a variable flow http://www.ritchiewiki.com/wiki/index.php/hydraulic - hydraulic system with a power and work mode selector, pilot activated control, horsepower summation control, high level of operator comfort, large cross-section design for the http://www.ritchiewiki.com/wiki/index.php/boom - boom and http://www.ritchiewiki.com/wiki/index.php/stick - stick , modified X-shaped carbody, increased stick and http://www.ritchiewiki.com/wiki/index.php/bucket - bucket force, and increased pressure in the travel circuit.

The 312 was manufactured in Japan, with a 6KG or 7DK serial number prefix; and in France, with a 6BL prefix.

Production ended in Japan in 1996; it was replaced by the http://www.ritchiewiki.com/wiki/index.php/Caterpillar_312B - Caterpillar 312B .

Based on data from the sales database of http://www.ritchiewiki.com/wiki/index.php/Ritchie_Bros._Auctioneers - Ritchie Bros. Auctioneers , it is estimated that more than 11,700 Caterpillar 312 hydraulic excavators have been produced.

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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."

Posted By: Tony.Or
Date Posted: 22 Sep 2011 at 4:46pm

Call around and check on parts before buying , Cat may be only source for parts, also make sure it isn`t a grey market machine repainted & decaled. Tony

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Posted By: Ages Cat
Date Posted: 22 Sep 2011 at 5:06pm

It may be worth your while to run oil samples on the engine and hydraulic system. An excavator with metal in the hydraulic system can be a real bad situation. A friend is a used equipment manager for a very large John Deere construction store group. They had a Hitachi with pump shavings in the system. Whatever they tried to clean the system did not work. I think it became a parts machine.

Posted By: Coke-in-MN
Date Posted: 23 Sep 2011 at 8:03pm

friend had JD hoe and estimate to rebuild hyd after metal was found in oil samples was $20,000. machine was not worth that so he has it for parts and bought another one similar.

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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."

Posted By: farmer0_1
Date Posted: 23 Sep 2011 at 10:44pm

great idea on the oil sampling on the engine and hydrualics. my next door neighbor had his 1266 int pump chips thru his tractor and sold it for the engine. keep them coming.