Description

Clark-hurth GPX, DPX Service Manual

You’ve got a Clark GPX or DPX forklift on the lift, and the aftermarket manual you bought online tells you to “tighten the head bolts to spec.” No torque value. No sequence. That’s how you warp a head gasket and turn a two-hour job into a two-day parts hunt. I’ve seen it. The Clark-hurth GPX, DPX Service Manual from AutoRepairManuals is the original OEM document that Clark handed to their own dealers. 602 pages of factory-written procedures, not some third-party rewrite. It covers the GPX/DPX 30/35/40/40S/50/55 series. If you’re doing any work on these trucks, this is the only book you should trust on the bench.

I’ve torqued more head bolts than most people have had hot meals. I trust OEM data because I’ve watched shops lose billable hours using aftermarket specs that were off by 10 ft-lbs. This manual came from Clark Technical Publications in Lexington, KY. It’s the real deal.

Engine Coverage: Perkins Gas/LPG and Diesel Workshop Manuals

The manual splits into two engine subsections: 00-02 for Perkins gas/LPG engines and 00-03 for Perkins diesel. Each includes detailed torque tension tables – cylinder head, piston and connecting rod assemblies, crankshaft assembly, timing case, cylinder block, lubrication, fuel, cooling. Page 4 shows the full contents outline. You don’t guess the sequence; you follow Clark’s written procedure. The diesel section alone covers cylinder head removal and fitting, valve seat correction, piston and connecting rod inspection, and big end bearing service. If you need to rebuild the Engine on your GPX or DPX, these are the only steps I’d trust.

Brake and Inching System: Bleeding and Adjustment Procedure

Group 23 covers the Brake and inching system completely. If your brake pedal goes to the floor or the inching pedal doesn’t disengage the transmission, the bleed procedure is described step by step. The manual also covers master cylinder overhaul, power booster overhaul, brake caliper replacement, and parking brake adjustment. Don’t skip the brake malfunction light check from the functional tests – that’s in the planned maintenance section. Safety first. A spongy pedal on a 55-series DPX can get someone hurt. Use the factory bleed procedure.

602 Pages of Factory-Proven Procedures

602 pages. That’s not a quick-reference card; that’s a textbook for your GPX/DPX. It covers the Transmission removal and overhaul (Group 06), the Fuel system – including the IMPCO vaporizing system and carburetor overhaul (Group 14), the electrical system with full wiring diagrams (Group 20), the drive axle end removal and differential overhaul (Group 22), and the hydraulic system from pump to tilt cylinders (Groups 29-34). For related heavy-duty transmission work, check out the Spicer Clark-hurth HR Service Manual – Factory Specs for Heavy-Duty Transmission. This manual gives you the same kind of factory depth.

Check the Transmission Fluid Before You Assume a Rebuild

Planned maintenance includes a transmission fluid check procedure. Don’t assume a slipping Transmission means a rebuild. The manual tells you exactly how to check the level and condition. Group 06 then walks through draining, refill, removal, and overhaul if needed. You need the right fluid spec and fill procedure. For background on manual transmission fundamentals, see Manual Transmission. The manual also covers the shift control brakes and steering system – critical for preventing driveline damage.

Fuel System: Carburetor Overhaul and Governor Adjustment

Group 14 covers the Fuel system from pump pressure tests to carburetor overhaul and governor adjustments. If your GPX runs rough or stalls, the diagnostic steps are laid out. The manual specifies the correct fuel pressure values and adjustment procedures for the velocity governor. Don’t trust a generic carb kit – use the OEM specs in this book. The manual also includes removal of the IMPCO vaporizing system for LPG models.

Original OEM Documentation – Not an Aftermarket Reprint

This manual is copyrighted “Intended for CLARK dealers only”. AutoRepairManuals has the largest collection of OEM shop manuals in North America. You are getting the same document that Clark technical publications released – SM 593. No aftermarket copy, no scanned-and-OCR’d knockoff. Every torque spec, every wiring color code, every tolerance comes straight from the factory. That’s the difference between a repair and a repeat job.

Period.

For related manuals, see the Clark-hurth 55A SERIES II Service Manual – 136 Pages of Factory Specs and the Clark-hurth SM-715, TMX12-25, EPX16-20s 2007 Service Manual – 502 Page OEM Facto. Also review the basics of Manual Transmission if you need a refresher.

Does this manual cover the DPX model as well as the GPX?

Yes. The manual covers GPX and DPX series 30/35/40/40S/50/55.

What if I need torque specs for the cylinder head?

Torque tensions for the cylinder head assembly are listed in the Perkins diesel workshop manual section 00-03 under “Recommended Torque Tensions.” That section also covers piston and connecting rod assemblies, crankshaft assembly, timing case, cylinder block, aspiration, lubrication, fuel, cooling, flywheel, and electrical equipment. You get the exact values in ft-lbs or in-lbs as specified by Perkins. If you don’t have that spec, you risk leaking head gaskets or warped decks. The manual gives the sequence as well. The Planned Maintenance section also includes “Critical Fastener Torque Checks” for chassis fasteners.

Access the Factory Manual from AutoRepairManuals and get the real specs on your workbench. No guesswork, no lost time.