Description

Clark-hurth 50, 60, 70 1999 Service Manual

If you’ve ever tried to rebuild a forklift transmission using a photocopied aftermarket manual that says “tighten until snug,” you already know why I’m writing this. That kind of guesswork gets you a ruined seal, a misaligned gear, and a customer who watches you drain three hours of billable time into a problem that never should have existed. The Clark-hurth 50, 60, 70 1999 Service Manual (SM-649) is the original factory document—printed for CLARK dealers only, copyrighted 1999, and never intended for resale. This is the 411-page binder that the guys in Lexington, KY put together so their own techs could keep CMP trucks running. It’s not a condensed rewrite. It’s the real thing.

Safe Maintenance: It’s Not Optional

Group SA kicks off with Safety, then Lifting, Jacking, and Blocking. Anyone who has lifted a 10,000-lb truck by the wrong frame point knows why that section exists. The manual spells out safe parking procedures, hoist points, and how to block the upright in raised position before you crawl under it. Page 1 shows the revision date (July 1999) and a clear warning: “Intended for CLARK dealers only – Do not sell or distribute.” That’s the level of seriousness this document carries. You follow the lifting procedure in Section 2 or you risk a 50/60/70 tipping on you. I don’t care if you’ve done this a hundred times—use the factory spec for jack placement.

Perkins Engine Section: What You Actually Get

Group 00 covers the Perkins diesel engine, and it’s not a generic overview. You get the full Perkins WORKSHOP MANUAL embedded inside, starting with engine identification, safety precautions for asbestos joints, and then straight into specs. There’s a whole sub-section titled “Recommended torque tensions” with data for cylinder head bolts, main bearing caps, connecting rods. The manual walks through disassembly of the cylinder head assembly—rocker cover, rocker assembly, valve tip clearances, valve springs—in the order a real tech would do it on the bench. If you’re pulling the head on a CMP model with a 50 or 60 or 70, you need the torque sequence from this manual, not a chart off some forum.

Torque Specs and Fluid Capacities: Why You Need OEM Numbers

Every single torque value in this manual came from the engineers who designed the truck. The “Recommended torque tensions” table includes ft-lb values for each fastener group. The “Data and dimensions” section lists cylinder liner protrusion limits, piston ring end gaps, and crankshaft journal diameters. Aftermarket reprints often transpose inch-pound and foot-pound values—I’ve seen it happen. One wrong torque on a flywheel housing bolt and you get a leak that takes an afternoon to trace. The 411 pages here are organized by Group and Section, each page ID’d like “00-1-2” for Group 00, Section 1, page 2. You don’t guess. You flip to the proper group and find the spec.

Who Should Buy This 411-Page Factory Manual?

Fleet mechanics who maintain multiple CLARK CMP models. Home-garage guys who own a 50, 60, or 70 forklift and want to do their own PM instead of paying a dealer $150/hour. Beginners who have basic wrenching skills but need a structured guide—this manual gives you the sequence for a stall test, cranking voltage test, and critical fastener torque checks (all part of the Planned Maintenance Program in Periodic Service). If you’ve never touched a Perkins engine before, the manual’s step-by-step for piston and connecting rod assembly (including big end bearing removal and small end bushing renewal) is clear enough that you can follow it with the engine on a stand. Just don’t skip the safety section.

How This Manual Differs from Aftermarket Reprints

Aftermarket manuals splice together scanned pages from different years, missing the binder holes and edge marks. This one is a direct digital copy of the original CLARK SM-649 binder. The table of contents lists Groups: Safe Maintenance, Periodic Service, Engine, Cooling System, Transmission, Electrical, Wheels and Tires, Brake System, Drive Axle, Steer System, Hydraulic System, Uprights, Counterweight, Specifications. Each group has its own table of contents inside. For example, the Steer System (Group 25) includes a pressure check procedure and overhaul of the priority valve. The Hydraulic System (Group 29) has pump overhaul and control valve overhaul—none of that “remove and replace as an assembly” nonsense. You get the full disassembly and inspection steps. That’s what you pay for when you buy from a source that doesn’t cut corners. If you need related factory specs for other models, check the CLARK GPH DPH 50 60 70 75 Service Manual or the Spicer Clark-hurth HR Service Manual – Factory Specs for Heavy-Duty Transmission. The Clark-hurth 55A SERIES II Service Manual – 136 Pages of Factory Specs covers a different series but same attention to OEM detail.

FAQ: Common Questions Before Buying

Does this manual cover the Clark-hurth 70 model with the Perkins engine?

Yes. The manual covers CMP models 50, 60, and 70. The enclosed Perkins workshop manual applies to the diesel engines used in those trucks. All torque specs, maintenance intervals, and overhaul procedures are specific to these models.

Are the wiring diagrams included?

Yes. Group 23 Electrical includes a circuit diagram and instrument pod section. The diagrams are factory-original, not redrawn.

What about the transmission section?

Section 34 covers the transmission. It includes specifications, troubleshooting, and overhaul steps. The manual references the internal components—clutches, seals, shafts—with tolerances. If you need background on how a Manual Transmission works, that’s a separate topic, but the manual gives you the CLARK-specific assembly order.

Can I print the PDF?

The file is a high-resolution digital copy with bookmarks. You can print any page. The manual is 411 pages, so if you print the whole thing, expect a binder that’s about two inches thick. I’d print only the groups you need—start with Safe Maintenance and the engine section.

You’ve read the specs. You know what’s inside. The 411-page factory binder that CLARK intended for their own dealers is available as a digital access. No guesswork, no translation errors. Get the torque values, the jacking points, the piston ring gaps that keep a Perkins running. Access the Factory Manual now and put it on your tablet or print it for the shop wall.