Description

Caterpillar D8K-8A-58, D8K-8S-8 1988 Technical Manual

You’ve got a Caterpillar D8K-8A-58, D8K-8S-8 1988 Technical Manual sitting in front of you – the official Unit Maintenance Repair Parts and Special Tools List, TM 5-2410-234-20P. If you’re ordering parts for a D8K-8A-58 or D8K-8S-8, the aftermarket catalogs will waste your time. Wrong supersessions, missing NSNs, exploded views that don’t match the real assembly. This manual fixes that. 386 pages of factory parts data, direct from the U.S. Army and Caterpillar. Page 1-1 starts SECTION II REPAIR PARTS LIST, where each figure gives you the exact part number, illustration number, and quantity needed.

The 386 pages are broken into groups – GROUP 01 ENGINE, GROUP 03 FUEL SYSTEM, all the way through GROUP 95. Each group has its own subgroups. For example, GROUP 01 includes 0105 Valves, Camshafts, and Timing System, and 0106 Engine Lubrication System. That’s where you’ll find the rocker arms, oil filters, and breather assemblies. Every part has a figure number – FIGURE 1 through FIGURE 119 – so you can visually confirm what you’re ordering. No more guessing if the oil cooler line you’re holding matches the schematic.

SECTION II: Repair Parts List (Page 1-1)

This is the core of the manual. SECTION II gives you the full repair parts list with illustrations. You get the National Stock Number (NSN), the part number, and the figure/indent number. Page 1-1 shows the start of GROUP 01 ENGINE, subgroup 0105 for valves and camshafts. If you need a rocker arm cover, FIGURE 2 on page 2-1 is where you look. The manual covers not just the engine – GROUP 03 FUEL SYSTEM has subgroups for fuel lines, filters, and injection components. GROUP 04 covers the air intake and exhaust. Each figure is numbered sequentially, and the parts list tells you exactly what you need.

GROUP 01 Engine: Valves, Camshafts, and Lubrication System

GROUP 01 is split into 0105 and 0106. 0105 covers the valve train – rocker arms, lifters, push rods, camshafts, and timing system. It includes FIGURE 1 for those components. 0106 covers the engine lubrication system – oil filter base and bracket (FIGURE 3), oil filler and breather assembly (FIGURE 4), oil level gauge (FIGURE 5), and oil cooler lines (FIGURE 6). If you’re rebuilding the top end of a D8K, these pages are gold. The parts list gives you the exact Caterpillar part number, not a generic aftermarket substitute that may not fit. Caterpillar D8K-8A-58 D8K-8S-8 1981 Technical Manual covers earlier production variations, but this 1988 edition supersedes the 1986 version with updated part numbers.

What Parts Groups Are Covered Beyond the Engine?

GROUP 05 is the fuel system – subgroups 0501, 0503, 0505. GROUP 06 covers the cooling system with subgroups 0601 through 0613 – water pump, radiator, fan, and lines. GROUP 07 is the air intake and exhaust system (0705, 0721). GROUP 09 is the starting system (0900). GROUP 13 is the power train – 1301, 1303, 1304 for the transmission and torque converter. If you’re dealing with a Manual Transmission issue on the D8K-8S-8, GROUP 13 is where you’ll find the parts. GROUP 14 covers the steering system, GROUP 15 the brakes, GROUP 18 the undercarriage, GROUP 20 the sheet metal and operator station, GROUP 22 the exhaust, GROUP 24 the electrical system, GROUP 47 the winch, GROUP 60 the bulldozer and ripper, GROUP 74 the attachments, and GROUP 95 the special tools. Caterpillar 3116, 3044C, 3114, 3408 Technical Manual | Piston Specs is a different engine family – keep your focus on the D8K groups for this tractor.

3 Groups You Shouldn’t Skip: Fuel, Cooling, and Power Train

GROUP 03 (fuel system) includes subgroups 0304, 0305, 0306, 0309, 0311 – that’s the transfer pump, injection lines, and filters. GROUP 06 (cooling) has the oil cooler lines and manifold lines – page 3-1 shows the oil filter base and bracket. GROUP 13 (power train) includes the transmission, bevel gear, and final drives. If you’re pulling a Manual Transmission on a D8K-8A-58, you need FIGURE numbers for the clutches and shafts. The parts list gives you the NSNs so you can order through military supply or Caterpillar directly. Aftermarket parts catalogs skip these details and lump components together. This manual separates them by figure and group, so you order exactly what came off the machine.

Use NSNs and Figure Numbers for Accurate Orders

Every figure in this manual has a parts list with columns: item number, part number, NSN, and quantity. For example, GROUP 0105 – FIGURE 1 lists the valves, camshafts, and timing parts. You don’t guess an interchange. You read the figure, look at the exploded view, and write down the part number. This manual also includes a full index (page I-1 through I-67) so you can find parts by name. If you need a special tool, GROUP 95 lists the tool number and NSN. Caterpillar 30A1, 4KC1, 8SZ1, 2WB1, 2WN1 1999 Technical Manual covers newer engines, but the D8K-8S-8 manual from 1988 has the correct part numbers for your machine.

OEM Source: Why Aftermarket Parts Catalogs Fail

Aftermarket parts distributors often renumber parts or omit superseded items. This manual is the original OEM document from Caterpillar and the U.S. Army. It supersedes TM 5-2410-234-20P dated 1 May 1986. The 1988 edition includes updates current as of 21 March 1988. You’re getting the parts list that the military used to maintain these tractors in the field. If the Army trusted it to keep their D8K-8A-58 (NSN 2410-00-574-7597) and D8K-8S-8 (NSN 2410-00-574-7598) running, you can trust it for your shop. No third party has added or removed part numbers – it’s the factory data.

Is this manual the same as a service manual?

No. This is a repair parts list and special tools list, not a step-by-step repair procedure.

Can I find torque specifications in this manual?

Torque specs are not included because this manual focuses on part identification. For assembly torque values you need the corresponding service manual. However, the parts list does reference specific bolts and washers by part number, which you can cross-reference to the service manual. The manual includes groups like GROUP 03 FUEL SYSTEM and GROUP 06 COOLING SYSTEM, each with exploded diagrams and part numbers. If you’re rebuilding a D8K-8A-58, start with this parts list to order everything, then use the service manual for installation torque.

If you’re maintaining a Caterpillar D8K-8A-58 or D8K-8S-8, this manual saves you from ordering the wrong gasket, bolt, or filter. 386 pages of factory parts data, indexed by group and figure, with NSNs for military and civilian procurement. Stop wasting time on aftermarket catalogs that have incomplete information. Access the Factory Manual and get the correct part numbers the first time.