Description

Altec AC26, AC28, AC30S Service Manual – Factory Repair Specs

If you’re turning wrenches on an Altec AC26, AC28, or AC30S, you already know these rigs aren’t backyard equipment. That rotary joint, the telescopic boom, the LMAP system — miss a torque spec by 10% and you’re looking at a dropped load or a sheared cap screw. I’ve seen it. This Altec AC26, AC28, AC30S Service Manual is the same 201-page document the factory sends to their dealers. Not a third-party summary, not a reprint missing pages. Original OEM print.

Page 26 in Section 4 gives you the exact torque for the rotation gearbox mounting cap screws. I’m not pulling that number out of memory — it’s in the book. You need the relief valve settings for the turntable circuit? That’s Section 8, right where they lay out the cycle times and pressure specs. No guesswork. No “check your local supplier.” It’s all written by Altec engineers, for guys who actually fix these machines.

7 Systems Covered – Hydraulic, Mechanical, Electrical

This manual breaks down every major system. Section 5 — Hydraulic System, runs from the LMAP protection system through each valve cartridge and cylinder. They give you bleeding procedures for cavitation and aeration, plus torque specs for every fitting. Section 6 — Mechanical Systems covers the rotary joint, rotation bearing, telescopic boom shimming, and the winch line termination. Section 7 — Electrical System diagrams the PDM, outrigger interlock, and foot throttle circuits. You get the schematic, the pin numbers, and the test points.

3 Reasons to Choose OEM Documentation

First, the torque values. Aftermarket manuals often copy the first edition and never update for service bulletins. Altec revises. Second, the safety procedures — Section 3 has a full disclaimer and safety instructions that a DIY summary skips. Third, the troubleshooting flowcharts in Section 8 walk you through hydraulic cycle tests, pump flow checks, and holding valve diagnostics step by step. No generic “check for leaks” hand-waving.

Does This Manual Cover the Fuel System?

The AC26, AC28, and AC30S are hydraulic cranes, not engine-driven chassis. This manual covers the crane assembly itself — outriggers, boom, winch, turntable, all hydraulics and electrical controls. If you need the truck’s engine or transmission specs, look at a separate chassis manual. For the crane body, this is the only book you want on the bench.

Torque Specs and Fluid Capacities – No Room for Error

Rotation bearing cap screws, wear pad bearing cap screws, rotation gearbox mounting cap screws — Section 4 lists each one with the correct torque in ft-lbs. It also shows the lubrication chart and diagram (page 15) with the recommended oils to use in San Antonio heat or Northern winter. The hydraulic system specs cover oil condition and contamination limits. If you’re flushing the system or changing the filter, Section 4 gives you the cleaniless procedures and water removal steps.

Page 53 in Section 5 is where you go for torque and tightening procedures on the JIC fittings and valve cartridges. Don’t trust your six-inch adjustable wrench. Use a calibrated torque wrench and this page.

LMAP System Diagnostics – Load Moment and Area Protection

Section 8 dives into the LMAP system troubleshooting. Pilot dump solenoid, pressure transducer, shuttle valve — you get the pressure test points and the adjustments. The manual also covers auxiliary power source procedures for lowering a disabled unit: rotating the turntable, retracting the boom, lowering the boom, retracting the outriggers. If the engine dies with a load in the air, this chapter keeps you from guessing which valve to crack.

Who This Manual Serves

I wrote this thinking of shop owners who have a fleet of Altec bucket trucks or cranes, DIY farmers who maintain their own equipment, and techs who bill by the hour. You don’t have time to hunt down a torque value from some forum. You need the factory procedure, printed, on paper or PDF, with the OEM part numbers and the exact steps. That’s what this manual is. If you’re a beginner, you can still follow the safety warnings and the disassembly sequence — but you’ll need a torque wrench and a multimeter.

Source Validity – OEM Factory Print, No Aftermarket Hacks

This is a direct scan of the original Altec factory service manual. No watermark, no missing pages, no “compiled from various sources” disclaimer. You get the glossary, the service tools list, the preventive maintenance checklist, and the accessory checklist in the appendix. Compare that to a $20 CD from a truck stop. You get what you pay for.

Frequently Asked Questions

Does this manual include wiring diagrams for the PDM?

Yes, Section 7 covers the Power Distribution Module, On/Off circuit, remote start/stop, and outrigger interlock system with pin and circuit identification.

What about the telescopic boom wear pad shimming?

Section 6 has a dedicated subsection on wear pad shimming and boom measurements. You’ll find the procedure and the wear limits.

Are the torque values listed in both ft-lbs and N-m?

The manual uses Imperial (ft-lbs) units. If you need metric, you’ll have to convert. That’s how OEM manuals are built for the North American market.

Can I use this manual for the AC26 only, not the AC28?

This manual covers all three models: AC26, AC28, and AC30S. They share the same hydraulic and mechanical architecture with capacity differences noted in the general specifications.

You need a copy on your tablet or printed and shopworn. Access the Factory Manual from our site — it’s the same 201-page PDF the factory sends. No shortcuts. No empty promises. Just the specs you need to do the job right.

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