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Clark-hurth C500 355 Service Manual – What You Get for the Workbench

If you are wrenching on a Clark-hurth C500 355 forklift and don’t have the factory service manual, you are working blind. I have seen too many guys try to set Hydratork transmission pressures with a generic chart from some forum and end up with a slipping clutch or a blown seal. That costs hours and parts you don’t need to replace. This manual is the original OEM document – the same one Clark gave their own dealers. It has 335 pages of procedures that start with safe maintenance practices and go through every adjustment and check you will need on that truck.

I have been turning wrenches for 28 years, and I can tell you right now: aftermarket manuals leave out the little numbers that matter. The Clark-hurth C500 355 Service Manual does not. It gives you the exact specs for governor adjustment, fuel pump tests, clutch adjustment, and the full sequence for Hydratork transmission drain and refill. You get the wiring color code so you can trace a short without burning up a harness. This is the kind of book you keep on the tool cart, not on a shelf.

C500 355 Service Manual: Engine Tune-Up and Cooling System Maintenance

Group 01 starts with lubrication charts and cooling system maintenance. You get the intervals and the correct fluid types – not “use any 30 weight” but the damn spec. Page 1 lays out the planned maintenance schedule. If you follow that, the engine will outlast the rest of the truck. The tune-up section covers points, timing, and carburetor adjustments if your truck still runs a gas engine. For LPG conversions, there is a separate note about closing the cylinder valve before you touch anything – that is in the safe practices on page 2.

Hydratork Transmission: Pressure Checks and Fluid Aeration

Group 06 is where the real work happens. The manual walks you through Hydratork transmission pressure checks with the truck on stands and the oil at operating temperature. There is a specific check for Manual Transmission versions, too – but the C500 355 is mostly automatic. You also get the transmission fluid aeration check, which most aftermarket books skip entirely. Foamy oil kills clutches fast. The manual tells you how to test for it and what to do if you find it.

Brake Bleeding and Adjustment: Group 23 Procedures

Brakes on a loaded forklift are not something to guess at. Group 23 covers brake bleeding, pedal adjustment, service brake adjusters, and parking brake adjustment. The manual gives you the pedal free-play spec and the method for adjusting the parking brake cable without overtightening. I have seen new techs crank the parking brake adjuster until the shoes drag – that wears drums in a few shifts. The factory procedure prevents that.

Wiring Color Code and Electrical Diagnostics

The wiring color code section saves you from chasing wires with a multimeter for hours. It lists every wire by function and color so you can identify circuits for the starter, alternator, neutral start switch, and the whole harness. Starter maintenance and alternator maintenance are separate sections – includes disassembly and test specs. If you have a no-start condition, the manual leads you through the neutral start switch check before you pull the starter.

How the Manual Handles Hydraulic System Checks

Group 26 and Group 34 cover the steering and upright systems. You get steering pressure check procedures, steer wheel bearing adjustments, and the upright drift test for tilt cylinders. The carriage adjustment and upright roller check are in Group 34. There is a whole section on triple-stage upright chain adjustment – that is not something you find in a generic manual. The manual also tells you how to drain the hydraulic sump tank and do a system pressure check. That’s critical for diagnosing weak lift or slow tilt.

3 Critical Safety Practices from the Manual

Before you open the first page of procedures, the manual beats safety into you. Page 2 lists owner safe maintenance practices: lower the load, set parking brake, disconnect power, block the mast before working under it. There is a specific warning about fuel shutoff for gravity-feed gasoline systems and closing the LP cylinder valve and running the engine dry before fuel system work. I have seen a shop burn down from skipping that step. The manual treats safety as a procedure, not a suggestion. You need that in your head every time you touch the truck.

Specifications and Daily Inspection Forms

Group 40 includes name plates, machine stampings, and the full specifications sheet for the C500 355. You get the official PM and daily inspection forms – photocopy them and use them. That’s how you keep a fleet consistent. The specs include fluid capacities, pressures, and tolerances. If you need to know the exact oil for the Hydratork transmission or the correct hydraulic oil viscosity, it’s in there. Also check out the related manuals for other Clark-hurth models: Spicer Clark-hurth HR Service Manual – Factory Specs for Heavy-Duty Transmission, 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.

If you want to understand how a Manual Transmission differs from the Hydratork, the manual gives you the engineering details. But for the C500 355, you are dealing with a torque-converter system.

Is this manual a PDF or a physical book?

Digital access – 335-page searchable PDF. Immediate access after purchase.

What if I only need the transmission section? Can I buy just that?

You get the whole factory manual. There is no piecemeal option. But here is the thing: if you only use the transmission section now, you will need the brake adjustment or the upright chain adjustment later. Having the complete manual on your laptop or tablet saves you from buying another book. The transmission section alone covers Hydratork pressure checks, aeration test, oil cooler service, drain/refill, and clutch adjustment. That’s around 30 pages of spec-specific data you will not find in a Chilton or Haynes book. And the wiring diagrams are worth the price alone when you have an intermittent electrical fault.

You have a Clark-hurth C500 355 that needs work. You can chase specs online and hope they match your serial number, or you can get the factory book and know they are right. Access the Factory Manual now and keep it on your phone or tablet in the shop. That is the difference between a job that goes smooth and one that ends with a call to the parts guy for something you already had.