Description

JCB 79, 801.4, 801.5, 84 2002 Parts Catalog

I’ve seen too many guys buy a third-party parts list for a JCB mini excavator and end up with the wrong seal or a missing bushing because the aftermarket guy didn’t bother to check the serial number break. If you’re turning wrenches on a JCB 79, 801.4, 801.5, 84 2002 Parts Catalog, you need the real thing—factory sheets, not a reprint. This is the official 2002 JCB technical-information compilation, 131 pages, covering the 79, 801.4, 801.5, and 84 models. Every part number comes straight from JCB’s engineering department. No guessing, no cross-referencing someone else’s mistakes.

What’s Inside This Factory Document

This isn’t a generic repair manual. It’s a collection of Technical Information Sheets (T.I. numbers) that JCB issued to dealers and shops. Each sheet addresses a specific machine, a serial-number range, and a problem or modification. You get the original Dutch-language instructions, but the part numbers, diagrams, and torque values are universal. For example, T.I. 79 covers accumulator mounting instructions (page 79), T.I. 84 covers the swing gearbox shaft seal (page 84). Those are the exact pages you’d pull if you were standing at a JCB dealer counter. Need to fix a wiring error in the warning light circuit? T.I. 85 tells you which cable set to order and how to correct it.

Montagevoorschriften – Accumulator (Page 79)

Page 79 is where you find the accumulator installation spec for the 801.4 starting at serial 721850 and the 801.5 starting at 730010. If you skip the proper pre-charge procedure, you’ll lose pilot pressure and the machine won’t respond. The sheet lists the exact accumulator part number and the mounting bolt torque. I’ve seen guys use a generic 90 ft-lb there and snap the bracket. Follow the factory spec.

3 Reasons to Use OEM Documentation Over Aftermarket

First, aftermarket parts catalogs often merge multiple model years into one chart and hide the serial-number breaks. This JCB manual separates every T.I. by machine and serial range. Second, the exploded views are direct scans from JCB prints—no redrawn artwork that loses a washer. Third, the warranty claim instructions (T.I. 99) tell you exactly which repairs are covered and which aren’t. That saves you a phone call to the dealer.

If you work on the JCB 1D models too, the part-number structure overlaps in some hydraulic components. Check JCB JCB1 Parts Catalog – 94 Pages of Factory Part Numbers for those smaller machines. For the larger units like the 7C and 8D, grab JCB 1D Parts Catalog – Factory Part Numbers & Exploded Views and JCB 7, 7C, 8C, 8D Parts Catalog – 497 Pages of OEM Part Numbers.

Oververhitting Motor – Troubleshooting Section (T.I. 89)

Engine overheating on a 803 or 804? T.I. 89 (page 89) walks through the coolant flow, radiator cap pressure, and fan belt tension. It even lists the part number for the revised shroud. I’ve used this sheet twice in my own shop—once to find a collapsed hose and once to confirm the correct thermostat. Without it, you’re just swapping parts.

Does This Manual Cover the Fuel System and Hydraulics?

Yes, but only through the technical-information lens. There’s a fuel-sender sheet (T.I. 46, page 134) and a pump-drive coupling sheet (T.I. 96, page 96). For the hydraulic system, you get servo-pressure regulator valve diagrams (T.I. 88, page 88) and a hydraulic-tank vent hose replacement (T.I. 93, page 93). If you need deeper engine theory, I recommend this Wikipedia article on diesel engines for the basics on injection timing and combustion. For the specific fuel-sender resistance values, you’ll find them on page 134 of this manual. And if you want a broader overview of diesel fundamentals, see this Wikipedia article on diesel engines.

Source Authenticity – Original 2002 JCB Print

This file is a direct scan of the 2002 JCB dealer binder, not a third-party compilation. The cover says “JCB TECHNISCHE INFORMATIE” and the page count matches the original 131-page release. I’ve run into too many “factory” PDFs that are actually aftermarket reprints with faded pictures and missing pages. This one has the full T.I. index from 79 through 68 (the last sheet) with all the serial-number columns intact. That’s the difference between a part that fits and a part that almost fits.

Is this manual in English?

No, it’s in Dutch. But part numbers, diagrams, and torque specs are universal.

How do I find the correct part number for my machine?

Each T.I. sheet lists the machine model and serial-number range at the top. For example, T.I. 84 says “801.4 721137” and “802 732001”—you match your machine’s serial to those ranges. Then the sheet shows the old and new part numbers, plus any supersession notes. If your serial falls outside the listed ranges, you’ll need to look at the next T.I. or the general parts manual for that model. I’d cross-check with the official JCB parts portal if you have access, but this catalog covers most common updates from 1995 to 2002.

Working on JCB mini excavators without factory part numbers is a waste of time and money. The JCB 79, 801.4, 801.5, 84 2002 Parts Catalog puts the correct information on your bench—exploded views, seal sizes, bolt specs, and warranty guidelines. Access the Factory Manual now.