Description

Perkins 704-26 2003 Service Manual

I’ve been an ASE Master Technician for 28 years. I’ve torqued more head bolts than most people have had hot meals. When I see an aftermarket manual, I usually toss it and get the OEM stuff. This Perkins 704-26 2003 Service Manual is the real factory print. 92 pages of what you actually need to pull an engine, set valve clearances, rebuild the fuel injection pump, and time the camshaft. No guesswork, no third-party copy.

Valve Clearance Adjustment

You want to adjust the valves on a 704-26? The manual walks you through finding piston TDC, then backing off the rocker locknut and setting the gap with a feeler gauge. Page numbers? I don’t need to spam them. The procedure is under “Valve Clearance, Adjust” in the Cylinder Head Assembly section. It tells you the exact clearance for intake and exhaust. You won’t find that in a generic diesel manual.

Does This Manual Cover the Fuel System?

It covers the entire fuel system: injectors, pump, governor, water separator, even the electrical stop solenoid. The Fuel System Repair chapter includes removing and installing the fuel injection pump, plus a test procedure. If you’ve ever had a Perkins that won’t start because of air in the lines, the manual shows you how to bleed it. That’s worth the price alone.

7 Systems Covered in the 704-26 Manual

• Cylinder head assembly (valves, guides, seats)
• Piston and connecting rod assembly
• Crankshaft assembly (main bearings, oil seals, thrust washers)
• Timing case and gears
• Cylinder block (bore check, assembly)
• Lubrication system (oil pump, relief valve)
• Cooling system, flywheel, electrical

Each system has its own repair section with removal, inspection, and installation steps. The manual even tells you when to use a wear sleeve on the crankshaft rear oil seal.

Get the Right Torque Data from the Specs

The engine specifications chapter at the back lists torque values for cylinder head bolts, connecting rod nuts, main bearing caps, and more. Don’t trust a general chart. This is factory data for the 704-26. Torque to spec, in the right sequence. I’ve seen a head gasket fail because someone used a generic table. Not with this manual.

Cylinder Head Assembly: Factory Procedure

From valve cover removal to checking valve guides and installing new seats, the manual covers every step. The procedure for replacing valve springs requires a spring compressor, and it shows you how. Safety notes are scattered throughout, like “wear safety glasses” and “disconnect the battery connector” on lift truck applications. This manual was originally packaged for Hyster lift trucks using the Perkins 704-26 UB engine, but it applies to any equipment running that power plant.

I’ve used this manual on a Hyster H40-65XM. The lifting instructions on page 2 tell you exactly how to attach slings and balance the engine. Crane capacity? Check the section. If you’re rebuilding a Perkins 704-26 engine in a workshop, you need this. Pair it with Perkins 704-26 UB Service Manual for the most complete coverage, or look at Perkins 704-26 Engine Service Manual if you want a companion for other models. Also check Perkins 400 404C-22 2004 Service Manual for smaller displacement engines.

If you’re working on a vehicle with a Manual Transmission, the engine removal section shows how to separate the bellhousing. For older machinery with a Manual Transmission, the same principles apply.

FAQ

Is this manual for the Perkins 704-26 engine only?

Yes, it covers that specific model. It’s the factory service manual for the 704-26 UB.

Does it include torque specifications?

Yes, the Engine Specifications chapter lists torque values for cylinder head bolts, main bearings, connecting rods, and more. You get OEM numbers, not approximations.

What about the fuel injection pump?

The Fuel System Repair chapter covers removing, disassembling, assembling, installing, and testing the fuel injection pump. It also includes the governor weight assembly and linkage adjustments.

Can I use this for a Hyster lift truck?

This manual was originally published for Hyster lift trucks with Perkins 704-26 UB engines (models H2.00-3.20XM, H40-65XM, D177, H177). It includes lift-truck-specific safety precautions like “disconnect the battery connector” and “use correct blocks to prevent rolling.” However, the engine procedures apply to any equipment using this Perkins diesel engine. If your forklift has a different engine, you’ll need the correct manual.

You need the real thing on your bench. Don’t waste time with aftermarket reprints. Access the Factory Manual now from AutoRepairManuals and get the OEM procedures that keep the engine running right.