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Hercules

Tech Tip #211: How to Identify the Hercules D2000, D2300, D3400, G2000, G2300 and G3400 Engines

This Dr. Diesel™ Tech Tip is one of a number we publish for the professional engine rebuilder community. It follows on the heels of Dr. Diesel™ Tech Tip #204: How to Identify the Hercules G1600 Engine, an earlier Tech Tip about Hercules engine serial numbers. Like the Tech Tip for the G1600 Hercules (also known as the CAT1404), this information only pertains to overhead valve Hercules engines. In other words, this Tech Tip only relates to engines with valve covers. We do not cover nor support the earlier flathead engines such as the QX or JX Hercules engines.
The Hercules overhead valve D2000, D2300, and D3400 as well as the G2000, G2300 and G3400 engines replaced the old Hercules flathead series. These are American-made, rugged, simple, easy-to-maintain in-line gas (“G”) and diesel (“D”) four and six cylinder engines used in a variety of industrial applications including stand-by generators and forklifts. There is a significant population of them still in productive service. Here are the ways to identify your Hercules D2300, G2300, D3400 or G3400 engine to order parts.
Hercules Model and Specification Numbers
These engines left the Hercules factory in Canton, OH with a silver tag the size of a business card that listed the engine model number (for example D2300). This same tag also listed a specification number (e.g. 276).  The model and specification numbers are listed on the factory tag in one long stream separated by an X. So, in this case it would read D2300X276. This model and spec data is usually all the information we need to identify the parts you wish to order. Unfortunately, by now it can be difficult to find the model and specification number for these engines. Usually the silver factory tag is long gone. But we can help.
Hercules Engine Serial Numbers
If the factory tag is missing on your Hercules engine, simply check the top of your block for a stamped in 7 digit number halfway down the top of the block on the camshaft side of the engine. For these specific engines (the Hercules D2000, D2300, D3400, G2000, G2300 and G3400 engines) this number will range from 3,400,001 to 3,500,000. With this serial number we can determine your model and specification number and supply parts to you.

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Tech Tip #204: How to Identify the Hercules G1600 Engine

The Hercules G1600 engine is one of the smaller industrial engines made by the Hercules engine company. It has been used successfully in Bandit Chippers, Daewoo forklifts,  water pumps, generators and also used in CAT forklifts where it has been private labelled by Caterpillar as the “CAT 1404” engine. The G1600 engine series has some important differences including whether the engine has provisions for a hydraulic pump (e.g., the ‘three gear style”) and type of fuel (gas, LPG, or natural gas) used. Moreover, there are two different water pumps depending on the flange style used. The G1600 cylinder head and its components vary significantly between the CAT 1404 and the G1600. As a result, you can’t use CAT 1404 valve parts and hardware on a G1600 and vice versa.
All in all, when ordering parts for a Hercules G1600 it is important to know the G1600’s engine serial number. Unfortunately, this can be hard to find if you don’t know where to look. This tech tip is going to show you how to find Hercules G1600 serial numbers.
How to Find a G1600 Serial Number
The Hercules G1600 serial number is a stamped-in number located near the dipstick. It is 7 digits in length beginning with 491, 490, or 493. With this number we can best identify your engine and supply the correct parts.

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