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Clark-hurth HWX, PWX 2007 Service Manual – Factory Torque Specs and Wiring Diagrams

I’ve torqued head bolts on everything from a Model T to a modern Detroit, and I’ll tell you flat out: If you’re working on a Clark-hurth HWX or PWX electric forklift without the factory manual, you’re asking for trouble. This is the 2007 Service Manual printed by Clark themselves – 190 pages of nothing but the procedures they use in their own service bays. No generic wire colors, no “check and adjust” nonsense. It’s the real deal. And if you’re a tech or a shop owner who bills by the hour, you can’t afford to guess on ACE2 controller parameters or drive motor clearances. I’ve had a guy spend half a day chasing a fault code because he used a spec from a 2003 book. The 2007 controller programming changed. This manual has the exact ACE2 factory settings in Group 19 Section 3. That’s the kind of detail that pays for itself in one job.

Clark-hurth HWX, PWX 2007 Service Manual – Factory Specifications in Group 40

Group 40 is where the truck specs live. If you need the exact fluid capacities, wheel torque, or system voltages, that’s where you look. Page 1 of the manual states it’s copyrighted for Clark dealers only – that tells you the level of detail inside. The revision history shows you what changed between printings, so you know your manual is current. Do not trust aftermarket summaries. I’ve seen too many guys strip a hydraulic fitting because some third-party book said 150 ft-lbs when the Clark spec is 125.

Group 14 Wiring Diagrams – Where the Diagnostics Start

Wiring is the first thing I check on an electric lift. Group 14 gives you HWX/PWX wiring diagrams as Clark published them. Wire colors, connector pinouts, circuit paths – all factory. If you’ve ever chased a ghost short using a hand-drawn schematic from a forum, you’ll appreciate having the original. This section alone saves me an hour on every electrical diagnostic. Pair it with the controller section for ACE2 diagnostics and you can isolate faults fast.

What Torque Specs Are in the HWX/PWX Manual?

Every rotating assembly in the drive unit, brakes, caster, and lift linkage has a torque value. Clark doesn’t leave you guessing. The manual lists spec for bolt grades and torque sequences where needed. For example, the drive motor brake assembly specs are in Group 23 Section 1. Do not reuse fasteners unless the manual says you can. I learned that lesson the hard way on a caster bolt that snapped because I reused a stretch bolt.

Drive Motor Overhaul: Rebuilding the Electric Motor

Group 16 covers electric motor service, drive motor overhaul, and pump motor overhaul. Each section walks you through disassembly, inspection, and reassembly. The manual tells you the required tool list – you’ll need a puller for the armature, a dial indicator for end-play, and an ohm meter for winding checks. The step-by-step repair procedures include dimensional limits. If the commutator is below minimum diameter, you replace it. That kind of data is what separates a rebuild from a waste of time.

Brakes and Coast Control – Group 23

Group 23 has two sections: drive motor brakes and coast control. The brake system on these trucks is critical for safety. The manual shows you how to adjust the parking brake, how to test the coast control solenoid, and the bleed procedure for the hydraulic brake circuit. Page 5 of the manual lists which truck models are covered – HWX and PWX base models, plus optional modules. So if you have a variant, you can order the supplement. But the core brake info is in this group.

Do not skip the PM inspection form in Group PS. The Planned Maintenance Program tells you what to check at 250, 500, and 1000 hours. That form is the difference between a truck that runs ten years and one that burns up a controller at 18 months.

If you’re also working on other Clark-hurth equipment, check out the Spicer Clark-hurth HR Service Manual – Factory Specs for Heavy-Duty Transmission for transmission overhaul data. For the smaller end, the Clark-hurth 55A SERIES II Service Manual – 136 Pages of Factory Specs covers a different platform but same attention to detail. And the Clark-hurth SM-715, TMX12-25, EPX16-20s 2007 Service Manual – 502 Page OEM Facto is a beast if you need the full lineup. For external reference, understanding how a Manual Transmission works can help conceptually with gear reduction units, though the HWX/PWX is electric drive. Similarly, if you ever work on a vehicle with a Manual Transmission, the clutch and shift linkage principles are different, but the diagnostic approach is the same – start with the factory manual.

Frequently Asked Questions

Does this manual cover both HWX and PWX models?

Yes, the base module covers both HWX and PWX. Page 5 confirms. You can purchase additional modules for specific truck options.

Are the wiring diagrams in color?

No, the original printed manual uses black and white. Wire colors are indicated with labels (e.g., “RED/BLK”). That’s standard for Clark factory docs of this era.

How do I find the lift cylinder torque specs?

Go to Group 34, Lift Cylinder, Section 1. The manual lists the tie-rod nut torque and packing gland torque. Do not exceed the spec or you’ll deform the cylinder tube. I’ve seen it happen.

Can I use this manual for other Clark models?

No. This 190-page manual is specifically for HWX and PWX models from 2007. Clark uses different Groups for different model lines. You need the correct manual for your serial number. Using the wrong one will give you wrong specs and could damage the truck or injure someone.

Access the Factory Manual now – stop relying on guesswork and forum advice. 190 pages of Clark-hurth HWX, PWX 2007 service information. Get it at AutoRepairManuals.