Description

Clark-hurth SM566 Service Manual – Original OEM Shop Manual

If you’ve ever wrestled a Clark SM566 with a manual that skipped the torque specs on the critical fasteners, you know the frustration. I’ve seen more than a few lift trucks come into my shop with stripped bolts because some generic ‘repair guide’ said ‘tighten until snug.’ That’s not a spec. This Clark-hurth SM566 Service Manual is the original dealer-only document. 125 pages of factory-engineered procedures. No aftermarket fluff. No guessing. The table of contents alone lists 40 groups covering everything from battery removal to upright adjustments. Every section includes step-by-step disassembly, inspection, and assembly. Safety warnings are printed in bold – not hidden in fine print.

Critical Fastener Torque: Group PM

Planned Maintenance starts with a general inspection, functional tests, and a test drive. Right after that, it hits you with CRITICAL FASTENER TORQUE. That’s where you find the exact numbers for every bolt that matters on this truck. The manual tells you to use a calibrated torque wrench – not an impact gun. If you skip that page, you’re asking for trouble. The lubrication chart and fluid specs are right there too. This is the kind of info that keeps a forklift running for years beyond its rated life.

Control Handle Disassembly and Assembly (13-01)

Control handle section walks through removal, disassembly, inspection, assembly. Inspection step checks for worn detents and damaged seals. Skip it and the handle drifts. The manual also covers master control switch and pallet clamp.

What the Brake Section Tells You (23-01)

Brakes on an industrial truck are not a joke. The brake section in this manual starts with a description, then gives you the adjusting procedure. It tells you how much free travel the pedal should have and how to set it. Then it covers brake cylinder maintenance, removal, disassembly, inspection, and assembly. The inspection checklist includes measuring cylinder bore wear and checking seals. The manual assumes you have a micrometer and a torque wrench. If you don’t, go get them before you start.

3 Major Systems: Hydraulic, Steering, and Drive

Three of the most complex systems on the SM566 are covered in depth. The hydraulic system (29-01) includes fluid and filter change intervals, pump troubleshooting, and full disassembly of the pump and valve. The steer pump (26-01) has its own section with brush removal and armature inspection, plus reconditioning steps. The drive unit (20-02) with a 14:1 ratio is shown in exploded views, with a specific torque sequence for the housing bolts. Each system includes a thorough inspection list that tells you what to look for and what to replace. Aftermarket manuals typically summarize these systems in one paragraph. This manual gives you 20 pages per system, with step-by-step instructions that assume you have the right tools – not a hammer and a prayer. That level of detail is why this manual will pay for itself the first time you avoid a hydraulic system misdiagnosis.

Use the Torque Table on Page 40-01

Specifications section (40-01) contains a torque table that lists values for every critical fastener on the machine. You get the basic dimensions, performance data, weights, chassis specs, and driveline numbers. The torque table is split by component – drive motor, steer pump, brake cylinder, upright bolts. Having this table saved me from stripping a steer pump mounting bolt last year. A third-party manual would have said “tighten to spec” without giving the number. Not here.

Dealer-Only Source: What the Copyright Notice Means

Open the first page and you’ll see: “Copyrighted Material – Intended for CLARK dealers only – Do not sell or distribute.” That’s how you know this is the genuine OEM document. It’s not a reprint that someone scanned out of a generic database. The wiring schematics are clear, the troubleshooting tables are detailed, and every part number matches the factory parts catalog. If you’ve been burned by aftermarket manuals that omit the safety message page or the index, this one has both. The index on page 3 lists every group with page references. You can find what you need in seconds.

Frequently Asked Questions

Does this manual cover the SM566 OP15 model only?

Yes, it covers the SM566 with OP15 upright configuration. The manual is model-specific.

Is this a reprint or a scanned copy?

This is a high-resolution scan of the original printed manual. It retains all factory details including torque tables and wiring diagrams.

What torque values are included?

The manual includes a dedicated Torque Table on page 40-01 covering critical fasteners for the drive unit, steering, brakes, hydraulic system, and upright assembly. These are not generic values – they are specific to the SM566. For example, the drive motor mounting bolts have a specific torque range, and the brake cylinder bolts are different. Using aftermarket specs can cause joint failure. The Planned Maintenance section also lists CRITICAL FASTENER TORQUE with exact numbers. You won’t find this detail in any aftermarket source.

Can I use this manual for other Clark models?

Not directly. The SM566 is a specific model. However, some procedures may be similar to other Clark electric trucks with OP15 uprights. You would need the exact manual for your model.

For those working on other Clark equipment, check these related manuals:

• Spicer Clark-Hurth HR Transmission Service Manual
• Clark-hurth 55A SERIES II Service Manual – 136 Pages of Factory Specs
• Clark-hurth SM-715, TMX12-25, EPX16-20s 2007 Service Manual – 502 Page OEM Facto

Background on how a Manual Transmission works can be found online. The drive unit in this manual relies on sound transmission principles. Understanding Manual Transmission fundamentals will help you follow the drive unit disassembly steps.

Stop fighting with incomplete information. Access the Factory Manual today and get the 125-page OEM document that Clark dealers were never supposed to share. Every spec, every step, every torque value is on the page – exactly as Clark Engineering wrote it.