Description

Clark-hurth EPG20, EPG30, ECG20, ECG32, ECG30x Service Manual – OEM Factory Specs

If you’re working on a Clark-hurth electric forklift and you don’t have the factory specs, you’re gambling with someone’s safety and your own time. I’ve seen too many guys try to guess torque values on critical fasteners or chase electrical gremlins with a generic wiring diagram. That’s how you snap bolts, burn up controllers, or worse. This is the genuine Clark-hurth EPG20, EPG30, ECG20, ECG32, ECG30x Service Manual – 653 pages of the same documentation Clark dealers use. No aftermarket copy, no missing pages. You get the exact Group-and-Section structure, revision history, and factory-required procedures.

Group SA – Safe Maintenance: Why You Read This First

Before you even think about touching a wrench, Clark-hurth forces you through Group SA. Page SA-1-1 starts with safety signs and messages, then runs through safe maintenance practices and general shop precautions. Lifting, jacking, and blocking? Section 2 covers raising drive wheels, chaining the upright in a raised position, and even shipping tie-down instructions. Towing procedures are in Section 3. You don’t skip this section. Ever. I don’t care if you’ve lifted a hundred trucks – the moment you assume you know the safe way to block a 2,000-3,200 kg machine is the moment you get crushed. Read the manual.

Critical Fastener Torque Checks: Don’t Skip This Step

Right after the model list, the manual points you to “Critical Fastener Torque Checks.” This isn’t a suggestion. Clark-hurth calls out specific bolts that hold the truck together – axle mounting, mast attachment, drive unit bolts. If you don’t torque them to factory spec, you get loose joints, driveline vibration, and accidents. The manual gives you the values. Use a calibrated torque wrench, not your “calibrated elbow.” No guesswork allowed.

Wiring Schematics: ECG and EPG with GE and SEVCON Controls

Group 17 is the electrical backbone of this manual. Section 1 alone has eight different wiring diagrams: ECG standard, ECG high performance, EPG standard, and all variants with GE pump control or SEVCON pump control. Need the ECG Standard Wiring Diagram with GE Pump Control? It’s there. The schematics are full-page, factory-issued, with every wire labeled. Forget aftermarket “equivalent” diagrams – they get colors wrong, miss fuses, and leave you chasing phantom shorts. Use the real thing.

For related models, check the Manual Transmission fundamentals if you’re dealing with driveline components on other equipment, but for these electric trucks, the wiring is what matters.

Electrical Motors – Brush Inspection and Commutator Maintenance

Group 16 breaks down the drive motor, hydraulic pump motor, and steering pump motor (permanent magnet type). Each section includes a brush inspection chart – you can track brush wear against hours of operation. The manual also tells you how to test motor insulation “Resistance to Ground.” That’s a megger test, not a quick multimeter check. Follow the procedure on page 16-1. If you’ve been commutator-grinding with sandpaper instead of a stone, stop. The manual tells you how to do it right.

Want to dig into other Clark-hurth transmissions? The Spicer Clark-hurth HR Service Manual – Factory Specs for Heavy-Duty Transmission covers heavy-duty units, while the Clark-hurth 55A SERIES II Service Manual – 136 Pages of Factory Specs is a shorter reference for that series. For newer models, the Clark-hurth SM-715, TMX12-25, EPX16-20s 2007 Service Manual – 502 Page OEM Facto gives you more coverage.

Source Validity: Why This Isn’t a Third-Party Reprint

AutoRepairManuals stocks only original OEM shop manuals. This Clark-hurth document carries Book No. SM-677, Rev. 2, with a revision history tracking every page change from SM 669 onward. Look at page 3 of the PDF – the revision table shows exactly which sections were updated. Aftermarket reprints blur pages, omit safety warnings, and often substitute generic torque values. This manual is the actual factory PDF, scanned from the Clark dealer binder. You can verify the part number (8027886) and copyright. No shortcuts, no copies.

For a broader understanding of how manual transmissions differ from electric drives, see Manual Transmission on Wikipedia – but remember, these trucks use electric drivetrains, so your reference is the electrical schematics here.

7 Systems Covered – From Battery to Control Panel

Group 19 covers the control panel and electrical sequence of operation for the ECG without pump controller. Each step in the sequence – connect battery, close key switch, park brake switch, SRO checks, energizing directional contactors, turning ON the transistor, plugging, and flyback – is explained in order. If you’ve ever been stuck on a no-move condition, this sequence alone can save you half a day of diagnosis. Test the accelerator, thermal protector, and pulse monitor trip (PMT) as shown.

Battery handling, tests, and removal are in Group 12. Switches (foot brake, parking brake, lift/tilt, forward/reverse, accelerator) are in Group 13. Everything is grouped logically – you don’t flip through random sections.

Does this manual cover all five models listed in the title?

Yes. It covers EPG20, EPG30, ECG20, ECG32, and ECG30x. The “Truck Models Covered by this Manual” section confirms the base module applies to all. Optional modules can be added for other variants.

Where do I find the torque specs for the drive motor mounting bolts?

Check the “Critical Fastener Torque Checks” section. Each bolt group is listed with its required torque. Don’t use the specs from a different model – they vary.

Is the wiring diagram for an ECG with SEVCON pump controller included?

Yes. Group 17, Section 1 lists “ECG Standard Wiring Diagram with SEVCON Pump Control” and “EPG Standard Wiring Diagram with SEVCON Pump Control.” Both are full-page factory schematics.

How long are the brush inspection intervals for the steering pump motor?

The manual provides a brush inspection chart with recommended intervals based on hours of operation. Inspect at every PM service – the chart is in Group 16, Section 4.

You need this manual on your bench – not as a reference you glance at once, but as the go-to document every time you touch one of these trucks. The OEM torque values, the correct wiring diagrams, the safe jacking procedures – they’re all here. Don’t trust your memory or a third-party summary. Access the Factory Manual and print the pages you need for the job. Your safety and your customer’s equipment depend on it.