Description

Clark-hurth CGC40, CGC70, CGP40, CGP70 Service Manual

If you are working on a Clark-hurth CGC40, CGC70, CGP40, or CGP70, and you don’t have the factory service manual, you are guessing. That costs time and money. I’ve seen too many guys try to eyeball a head bolt torque on a Perkins diesel and end up with a blown gasket. This Clark-hurth CGC40, CGC70, CGP40, CGP70 Service Manual is 657 pages of factory-specified procedures. Not a reprint. Not a scan of a scan. It’s the actual dealer-level documentation from Clark Material Handling. Let me show you what you get.

Clark-hurth CGC40, CGC70, CGP40, CGP70 Service Manual: What’s Inside

Every group in this manual follows Clark’s own numbering system. Group 00 covers engines, Group 01 cooling, Group 02 fuel, Group 03 air induction, Group 06 transmission, Group 12 ignition, and Group 14 electrical. That structure alone saves you time when you are chasing a problem. The Table of Contents at the front gives you the page for each group, and each section has its own internal Table of Contents. You do not waste time flipping pages looking for the oil pump specs.

Engine Overhaul: 4.3L V6 and Perkins Diesel Procedures

Two full engine sections live in Group 00. The 4.3L V6 overhaul includes disassembly, inspection, cylinder bore reconditioning, measuring piston pin to piston, piston assembly, camshaft, crankshaft, oil pump, valve train, cylinder head, and complete assembly steps with fastener tightening specifications. The Perkins diesel engine section is embedded as a separate mini-manual inside Group 00. It covers cylinder head assembly, piston and connecting rod assemblies, crankshaft assembly, timing case and drive assembly, cylinder block, CAV fuel injection pumps, lubrication system, rotary fuel injection pump, cooling system, flywheel, electrical equipment, and a list of special tools. You want the recommended torque tensions for the Perkins? They are listed in the specifications chapter of that diesel section.

Safe Maintenance – Don’t Skip the Lifting and Blocking Pages

Group SA is not boilerplate. It covers specific procedures for lifting, jacking, and blocking your particular truck model. If you have ever seen a forklift come off a jack because someone blocked it wrong, you know why these pages matter. Use the towing section if you need to move a disabled unit. These are not generic safety warnings – they are written for the CGC/CGP chassis geometry.

How Does This Manual Handle the Diesel Engine?

The Perkins diesel engine manual inside Group 00 (the embedded PDF) is a complete factory document with its own table of contents. It includes engine identification, safety precautions dealing with asbestos joints, basic engine data, recommended torque tensions, data and dimensions, cylinder head assembly with rocker cover and valve tip clearances, piston rings and small end bush, crankshaft with rear oil seal and thrust washers, timing case with fuel pump gear, camshaft gear, and crankshaft gear, CAV fuel injection pumps and rotary fuel injection pump, cooling system with thermostats and water pump, and a full list of special tools. If you are working on a Perkins, this is not an aftermarket approximation – it is the factory manual.

3 Reasons to Trust OEM Documentation Over Aftermarket

First, this manual was copyrighted for Clark dealers only and printed by Clark Material Handling – the people who built the truck. Second, the 657 pages include engine overhaul procedures for both the 4.3L V6 and the Perkins diesel that no third-party manual reproduces accurately. Third, the torque values and specifications come from original factory testing, not from a generic database. When you see a page with heading “Recommended torque tensions” for the Perkins, you know that number came from Clark’s engineers.

FAQ

Is this manual the same as the one Clark dealers use?

Yes. This is the SM-612 revision manual intended for Clark dealers.

What engine types does it cover?

It covers the 4.3L V6 gasoline engine and the Perkins diesel engine. The Perkins section includes complete specifications, torque tensions, cylinder head assembly, piston and connecting rods, crankshaft, timing case, cylinder block, CAV fuel injection pumps, lubrication, cooling, electrical equipment, and a list of special tools. That is over 100 pages of diesel-specific content.

Does it include wiring diagrams?

Yes, Group 14 covers the Electrical System with schematics and component locations.

Can I use this manual for a CGP70 with a different transmission?

Group 06 covers the H-200 transaxle overhaul. It also includes troubleshooting, drain and refill, and removal procedures. If your truck uses a hydrostatic variant, check Group 06(H) sections.

If you are tired of chasing bad information, get the document that Clark intended for their own technicians. Access the Factory Manual from AutoRepairManuals and keep it on your workbench.

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For background on transmission types, see Manual Transmission and Manual Transmission.