Description

Clark-hurth SF12-20SD, SF12-20SL, SF12-20SG, SF15-20SLC, CMP15-20SD 2004 Service Manual

You’ve got a lift truck down because some aftermarket PDF told you the head bolt torque was 80 ft-lb when it should have been 120 ft-lb. Now you’re pulling a warped cylinder head. I’ve seen it a hundred times. That’s why this Clark-hurth SF12-20SD, SF12-20SL, SF12-20SG, SF15-20SLC, CMP15-20SD 2004 Service Manual exists. It’s the OEM factory print – 665 pages – directly from CLARK Material Handling Asia. No reprints, no third-party guesses. This is what the dealer techs used on the bench.

The manual opens with a safety section (00-03) that every person touching this machine should read. General precautions, preparations for work, cautions during operation. Then straight into standards – the standard tightening torque table is on page 00-04-10. That’s the one you need when you’re swapping a wheel motor or bolting down a mast. I don’t care if you’ve done it a hundred times – check the spec. Every time.

SF12-20SD, SF12-20SL, SF12-20SG: Which Models Are Covered?

Every variant in the 1200-2000 kg rated capacity range: SF12-20SD, SF12-20SL, SF12-20SG, SF15-20SLC, and CMP15-20SD. Also includes CMC15-20SL. The manual covers the whole family. If you’ve got a CLARK lift truck with a 1.2 to 2.0 ton capacity from the mid-2000s, this is the service document.

3 Engine Chapters for 3 Different Powerplants

Chapter 10 covers the MMC 4G63 LPG/gasoline engine. Chapter 15 goes into the Yanmar 4TNE88 diesel. Chapter 16 handles the Tier 2 4TNV88/94L diesel. Each chapter includes specifications, troubleshooting tables, disassembly and reassembly steps, and – you guessed it – tightening torque values for every nut and bolt. The fuel system sections are separate for gasoline, LPG, and diesel injection. The carburetor adjustments and the governor procedures are laid out step by step, not some generic “replace if worn” nonsense.

Fuel System: Carburetor and Injection Procedures

For the LPG/gasoline engine, the fuel system chapter (10-06) walks through removal, installation, carburetor service for both gasoline and LPG, plus air governor and LP components. For the diesel, Chapter 15 includes fuel injection pump and governor exploded views, disassembly, inspection, and reassembly. If you’re chasing a fuel leak or a no-start condition, the troubleshooting by symptom tables (10-08, 15-04) will save you hours of swapping parts.

Does the Manual Cover the Fuel Injection Timing?

Yes – Chapter 15-06 includes checking and adjusting fuel injection timing, adjusting no-load max/min revolutions, and measuring compression pressure. The service data section (15-09) gives you piston ring end gap, side gap, crankshaft clearance – all with imperial measurements. The standard bolt and nut torque table (15-10) is the one you pin to the wall.

Skip the torque step at your own risk.

Get the Right Torque Data for the Yanmar 4TNE88

The Yanmar 4TNE88 chapter alone runs over 100 pages. Special service tools are listed (15-05). Measurement, inspection and adjustment procedures are given with specific values – not range guesses. The tightening torque tables (15-10) include main bolt/nut torque and standard bolt/nut torque. If you use a generic chart, you’re guessing. That costs parts and time.

Source Validity: Why OEM Matters More Than a $20 Access

This is a factory service manual – Part No. 8021718, Manual No. SM-687, Rev.1, June 2004. The first page says “Copyrighted Material – Intended for CLARK dealers only.” That’s the real deal. Aftermarket manuals copy the pictures but mess up the specs. The measurement conversions page (00-04) gives you exact inch-to-metric conversions. The periodic maintenance schedule (01-04) tells you when to change the coolant, fuel filters, and lube oil based on hours, not feel.

If you’re working on the transmission, check out the Spicer Clark-hurth HR Service Manual – Factory Specs for Heavy-Duty Transmission. For other models, the Clark-hurth 55A SERIES II Service Manual – 136 Pages of Factory Specs and Clark-hurth SM-715, TMX12-25, EPX16-20s 2007 Service Manual – 502 Page OEM Facto are also available.

For background on the principles of power transmission, see Manual Transmission and Manual Transmission.

What engines are covered in this manual?

The manual covers the MMC 4G63 LPG/gasoline engine and the Yanmar 4TNE88 diesel engine, plus the Tier2 4TNV88/94L diesel.

Why should I trust the torque specifications in this manual over aftermarket sources?

Because this is the exact OEM manual that CLARK dealers were issued. The torque values came from the engineering department that designed the machine. Aftermarket manuals often copy the illustrations but input generic torque ranges that don’t match the specific bolt grade, thread pitch, and clamping load required. Using the wrong torque can strip threads, cause gasket leaks, or worse – break a bolt in service. The 00-04 standards section and the engine-specific torque tables (10-02, 15-10) give you the exact ft-lb values for every fastener. No guesswork, no shadetree numbers.

This manual is the difference between a repair that holds and a comeback that costs you twice. Access the Factory Manual and get the correct specs on your screen before you turn a wrench.