Description

Clark Equipment 125 IIIA Parts Catalog

If you are tearing down a 125 IIIA articulated tractor shovel and need a part number, do not trust some third‑party parts list. I have seen too many mechanics order the wrong brake chamber because they used aftermarket cross‑references. This Clark Equipment 125 IIIA Parts Catalog – 226 pages of factory‑issued part numbers and exploded views – will keep you from making that mistake. Every diagram comes straight from Clark Equipment’s own engineering drawings, not a reprint of a reprint.

Accessories, Engine – Cummins and G.M. Sections

The catalog splits the engine accessories into two separate headings: “Accessories, Engine — Cummins” and “Accessories, Engine — G.M.” Each gets its own page range (pages 2 and 3). If you are working on a Cummins‑powered 125 IIIA, you flip to page 2. For the G.M. variant, page 3. The same approach applies to air cleaners, fuel tank caps, and the transmission converter filter cartridge kit. No generic “fits all” listings. You pick your engine, you get the correct part number.

Brake Systems: Air Lines, Valves, and Slack Adjusters

Brake components are documented by engine type as well. “Brake Air Lines — Cummins” appears on page 73; “Brake Air Lines — G.M.” on pages 75 and 77. The Air Brake Valve gets its own entry on page 78. If you need the slack adjuster, it is listed on pages 57 and 63 (shared with the axle sections). The manual shows the valve, the air chamber, and the reservoir with OEM part numbers. I have seen shops waste half a day hunting for a parking brake valve – this catalog points you to the exact piece.

Skip the third‑party catalogs. They cost you time.

Transmission and Converter Components – Six Sub‑assemblies

The transmission section covers the case (page 44), the control cover assembly (page 47), the air breather (page 43), the oil fill cap (pages 37, 39), and the charging pump for the converter (pages 49, 51). The first‑and‑second clutch group is on page 45; the input‑reverse‑third‑and‑fourth clutch group is on page 46. If you are rebuilding the Transmission, you need the exact clutch pack part numbers. This catalog gives them, and it includes the torque converter air breather (page 51) and the cartridge filter kit references (pages 2, 37, 39). You will also find the “Cap, Transmission Oil Fill” for both engine options – a detail many aftermarket lists miss.

Hydraulic System: Bucket, Boom, and Pump Assembly

The bucket and boom hydraulic pump is covered on page 89, the full bucket and boom hydraulic system on page 91, the bucket cylinder assembly on page 92, and the boom cylinder assembly on page 93. The control valve assembly spans pages 95 and 97. Each page includes an exploded view with callouts for every seal, piston, and fitting. Air valve assembly for the bucket leveler (page 16) is separate, so you do not have to dig through the whole hydraulic section to find that small component. The bucket assembly data (page 15) lists cutting edges and bucket parts. This is the kind of organization that saves a Saturday afternoon.

Clark Equipment 125 IIIA Parts Catalog – Axle Assemblies and Torque Data

Front drive axle assembly is on pages 55 and 57; rear drive axle on pages 61 and 63. Each axle page includes the slack adjuster and air chamber details. Torque values for axle mounting bolts appear in the front drive axle section (page 55). A factory parts catalog does not always list torque specs, but this one includes them for critical fasteners. You can also find the “Brake Assembly — Front and Rear” on page 67 and the parking brake assembly on page 68. The parking brake controls are on page 71. Having these part numbers matched to the correct torque data means you can order the right hardware and install it to factory spec.

Why Factory Parts Catalogs Beat Aftermarket Versions

Aftermarket parts sources often combine multiple models into one PDF, or they skip pages to save space. This Clark Equipment 125 IIIA Parts Catalog is the original factory print. It covers machine serial numbers 404A101 and after (Cummins) and 403A101 and after (G.M.). You get the exact part numbers for your specific serial number range. The document includes a full table of contents, page numbers matching the original binder, and detailed exploded diagrams. If you want to understand the Clark Equipment 125 IIIA 1974 Parts Catalog – OEM Factory Manual or the Clark Equipment 125 IIIA Parts Catalog – Factory OEM Manual, this is the source. For a related model, check the Clark Equipment 75B 1989 Parts Catalog – OEM Factory Manual. The automotive industry relies on precise documentation; see the Automotive Industry Overview for context on OEM standard practices. Automotive Industry Overview

Frequently Asked Questions

Does this parts catalog include torque specifications?

Yes, for certain critical fasteners such as axle mounting bolts (page 55) and brake assembly hardware. The manual is a parts catalog, not a service manual, but it does list torque values where needed for correct part selection and installation.

Can I use this catalog for a 125 IIIA with a different engine than listed?

Only the Cummins and G.M. engines are covered. The serial number ranges are clearly stated. If your machine has a different powerplant, this catalog will not apply.

This 226‑page original factory document is the most reliable way to identify and order parts for the 125 IIIA. Do not rely on a generic parts lookup. Access the Factory Manual from AutoRepairManuals and keep a copy on your shop tablet. You will burn less time looking up parts and more time turning wrenches.