Description

Clark-hurth SF20, SF25, SF30, CMP20, CMP25 2004 Service Manual

You have a Clark-hurth SF20, SF25, SF30, CMP20, or CMP25 forklift on your lift. The job calls for a valve adjustment on the gasoline engine, or maybe a fuel injection pump overhaul on the diesel. You pull out a third-party manual and the torque values don’t match the bolts on your bench. That is how head gaskets fail and hydraulics leak. This Clark-hurth SF20, SF25, SF30, CMP20, CMP25 2004 Service Manual is the same 486-page document CLARK dealers used. No condensed reprints. No “approximate” specs. You get the exact tightening torques, clearances, and diagnostic trees straight from the factory floor. I have torqued more head bolts than most people have had hot meals – and I will tell you, using OEM data on a job like this separates a repair from a repeat.

Engine Overhaul Coverage

Two separate engine sections live inside this manual. Section 10 covers gasoline and LPG engines – the full 10-02 specification table includes valve clearances, ignition timing, and special tool numbers. Section 16 dives into the Tier2 diesel (4TNV88/94L) with its own disassembly and reassembly procedures. Need the charge pressure spec? Flip to page 73. Do not guess on piston ring gap or connecting rod bolt torque – those numbers are listed in the service specification tables. The manual even breaks out the LPG fuel system (10-09) with advanced diagnostics for the MI-04 system, including electrical connections and the N2001 pressure regulator converter. That section alone saved me two hours on a CMP25 that would not idle.

Does This Manual Cover the Fuel System?

Fuel is a big deal on these machines. Gasoline, LPG, and diesel each get their own chapter. For LPG, section 10-09 gives you the MI-04 LP system from tanks to mixer. For diesel, section 16-07 walks through the fuel injection pump and governor. Each section includes troubleshooting by symptom – no vague flowcharts. You will find the exact test pressures for the LPG regulator and the injector pump timing marks. Page 109 shows the LPG fuel tank inspection procedure. If you are working on a Tier2 diesel, the manual includes the EPA-specific circuit diagrams in section 70. This is not a one-size-fits-all fuel section. It is specific to your model and your engine.

Get the Right Torque Data

Torque is where most aftermarket manuals fall apart. The CLARK service manual includes standard tightening torque in section 00-04 and then repeats specific torque tables in every subsystem. Section 10-02 lists engine tightening torque. Section 16-11 gives diesel bolt torque. Section 01-05 is the general torque chart for the entire machine – and yes, it includes conversions from foot-pounds to Newton-meters. Do not mix up the grades of bolts. The manual tells you the grade and the corresponding torque. Use a click-type wrench rated within range, and always check the fastener condition before you pull.

7 Systems Beyond the Engine

This manual covers more than the powerplant. Transaxle (section 20) includes hydraulic circuit, service brake adjustment, and clutch assembly removal. Steering system (section 30) walks you through the priority valve and the steering unit. Brake and inching system (section 40) gives bleeding procedures and assembly steps. Hydraulic system (section 50) covers the main pump, main valve, and cylinder disassembly. Mast maintenance (section 60) covers standard, full free lift, and triple mast types plus carriage, chains, and forks. Circuit diagrams (section 70) provide hydraulic and electric schematics for diesel, gasoline, and LPG. Each section has its own specification and tightening torque tables. You need to rebuild a wheel end? Section 20-02 gives you the shimming procedure for the pinion gear.

Safety First: Factory Precautions

Section 00-03 is titled “Safety” and it is not an afterthought. General precautions, preparations for work, cautions during operation – these pages are required reading before you crack any lines. Forklifts have high-pressure hydraulics and rotating powertrain parts. The manual tells you to block the mast, chock the wheels, and bleed pressure before disconnecting hoses. I have seen a technician skip the “preparations for work” checklist and get sprayed with hot hydraulic oil. Follow the factory safety steps, and use the lifting, jacking, and blocking information in section 60-02. Page 15 lists the measurement conversions so you can confirm your torque wrench is set correctly.

Can I use this manual for my CMP15?

No – this manual is only for SF20-30 and CMP20-25 models.

What if I need torque specs for the transaxle?

Section 20-01 includes specification tables for the transaxle, and section 01-05 provides the standard tightening torque for fasteners used on transmission housings, hydraulic lines, and brake assemblies. Page 73 contains the clutch assembly torque values. Always cross-reference the bolt grade listed in the manual – ordinary grade 5 bolts will not hold up in a differential carrier. Use a torque wrench with a range that covers the specification (typically 30–150 ft-lb on the larger fasteners). If you are installing a new pinion gear, section 20-03 gives the shimming procedure and the bearing preload torque sequence. Do not rely on memory – open the manual every time.

Stop wasting billable hours on wrong data. This 2004 service manual gives you the OEM procedures, the real specs, and the safety warnings that keep you alive. Related manuals: CLARK SF20-30 CMP20-30 2004 Service Manual – the same document, CLARK CMP15 CMP20 Service Manual – Section: Copyrighted Material for smaller models, and Spicer Clark-hurth HR Service Manual – Factory Specs for Heavy-Duty Transmission for older powertrains. For background on Manual Transmission principles, see the Wikipedia article. And if you need to understand hydraulic clutch operation, the Manual Transmission page also covers torque converter basics. Access the Factory Manual and get the job done right the first time.