Description

Terex Schaeff HML 20 1991 Parts Catalog

If you’re trying to find the right replacement part for a Terex Schaeff HML 20, you know the drill—you’ve got a machine down, the dealer wants a serial number, and aftermarket parts catalogs give you a drawing that sort of looks right but the numbers don’t match. That’s where a factory Terex Schaeff HML 20 1991 Parts Catalog comes in. Not a reprint, not a PDF of a photocopy—this is the original 186-page document from Schaeff-Terex GmbH & Co KG, dated 1.91, covering serial numbers 131/0099 through 131/0338. I’ve been turning wrenches for 28 years, and I can tell you: having the factory exploded diagrams with the correct part numbers saves you the headache of ordering the wrong seal and having the machine sit another week. This catalog follows the same structural standards as those used in the Automotive Industry Overview for parts documentation.

What You Get in This 186-Page Catalog

Page 1 gives you the edition date (1.91) and the valid serial number range. Page 2 is the full index, listing every section from “Wichtige Hinweise” (important notes) through “Vorsatzgetriebe – HA” (facing gear – rear axle). Each section has a “Bildtafel” (diagram) with callouts and a corresponding parts list. The catalog is trilingual—German, English, French—so if you’re in North America you read the English column. You get the original OEM part numbers, not some re-indexed aftermarket string. Don’t trust generic catalogs that claim to cover the HML 20 but skip the hydraulics or axle groups. This one covers all 52 numbered sections, plus two unnumbered entries for “nicht belegt”.

Engine and Pump Assembly Breakdown

Section 10, “Motorraum,Pumpeneinheit” (engine compartment, pump assembly), breaks down the entire driveline from the engine block to the hydraulic pump mounting. If you need a new pump coupling or a seal for the pump drive, the diagram will show you the exact part. Aftermarket parts sites love to sell you a “pump assembly” for eight hundred bucks when all you need is a bushing. This catalog lets you pinpoint the component. You’ll also find the tool list in section 2 (Werkzeug und Zubehör)—useful if you’re planning to pull the pump and need the right puller.

Axle and Differential Groups: Front and Rear

Sections 43 through 52 cover the axles. You’ve got separate entries for front and rear axle housings, hub assemblies, differential housings, differential internals, disc brakes, and the facing gear. For example, section 44 (Achsrohr, Radnabe – VA) gives you the part numbers for the front axle tube and wheel hub. Section 48 (Achskörper, Radnabe – HA) does the same for the rear. If you’re chasing a leak at the hub seal, you can look up the exact seal or bearing number. Don’t trust a one-size-fits-all axle drawing—this catalog respects the difference between the front and rear differentials (sections 46 and 50).

What Part Numbers Are Listed for the Swing Gear?

The swing gear—section 24 (Schwenkgetriebe)—is a common failure point on these excavators. The catalog provides the exploded view of the slewing gear and the hydraulic motor (section 25: Hydromotor für drehantrieb). You get the part numbers for the gear set, bearings, and motor assembly. If you need to rebuild the swing brake or replace the pinion, you can order the right parts the first time. Section 17 (Hydr.Inst.-Fahren) and section 18 (Hydr.Inst.-Schwenken) are also key if you’re troubleshooting travel or swing issues.

Why You Want the Original Factory Parts Catalog Not a Copy

Aftermarket parts catalogs often use generic drawings and re-indexed part numbers that may not match the OEM supersessions. This catalog is a direct scan of the 1991 original from Schaeff-Terex. The part numbers listed here are the ones the factory stamped into parts. Your TEREX dealer will recognize them. Plus, the catalog includes the original “Wichtige Hinweise” (important notes) that tell you how to interpret the numbering system. If you want to understand the broader context of parts catalogs in the automotive industry, see the Automotive Industry Overview. But for this machine, there’s no substitute for the factory document.

Frequently Asked Questions

Is the manual in English?

Yes. The catalog is trilingual—German, English, French. The English column is clearly labeled ‘Name’.

How do I confirm this catalog matches my machine’s serial number?

Page 1 states: ‘GUELTIG AB FZ-ID.NR. • VALID FROM SERIAL NO. • A PARTIR DU NO. DE SERIE 131/0099>131/0338’. That means this edition covers HML 20 machines with chassis numbers from 131/0099 through 131/0338. If your machine falls within that range, this catalog applies. If not, you need a later edition. Check the data plate on your machine near the operator seat or on the frame. The catalog also references page 1 of the index list for the serial number range. So verify before you assume.

Can I use this catalog to order parts from my local TEREX dealer?

Yes. The part numbers listed are the original OEM numbers used by Schaeff-Terex. Hand your dealer the number from the diagram, and they can look up current availability. Some numbers may be superseded, but the base reference is correct.

Does it include exploded views of the hydraulic cylinders?

Yes. Several sections cover cylinders: Kühlzylinder (articulation cylinder), Abstützzylinder (outrigger cylinder), Auflerzoyl, Löffelstielzyl. (bucket cylinder, dipper arm cylinder), and Grabzylinder (grab cylinder). Each has its own diagram with part number callouts for the cylinder body, rod, seals, and fittings. If you need to rebuild a cylinder, this catalog gives you the seal kit numbers.

Don’t waste time with aftermarket parts lists that leave you guessing. Access the Factory Manual from AutoRepairManuals and get the real OEM data for your Terex Schaeff HML 20.

Related Manuals

• TEREX SCHAEFF HML 20 Parts Catalog Serie A 1.93
• Schaeff-Terex SKL 863 2003 Parts Catalog
• SCHAEFF-TEREX SKL 853 2003 Parts Catalog