Description

Fiatallis 645-B 1990 Parts Catalog – OEM Factory Specs for Wheel Loader

You’re pulling a Fiatallis 645-B into the bay because the operator says the brakes feel spongy and the bucket hydraulics are acting up. Your parts guy hands you a generic cross-reference list and says “these should work.” Should work. I’ve seen more machines torn down because somebody trusted “should work.” That’s exactly why you need the real thing – the factory-issued Fiatallis 645-B 1990 Parts Catalog. Not a reprint from some third-party outfit that scanned the cover and called it a day. This is the 369-page original, Form 73073134, direct from Fiatallis. Every part number, every assembly breakdown, every serial number range is backed by the factory’s own engineering drawings. No guesswork, no returns because the seal kit didn’t match.

Brake Systems: Front and Rear Axle Coverage

Brake assemblies on this wheel loader are heavy-duty planetary wet disc units. The catalog gives you separate exploded views for the front axle (page 152) and rear axle (page 154). You’ll see the exact seal kits, piston plates, and bearing numbers. Need the parking brake assembly? That’s on page 148. And the emergency brake control group – page 151. If you’re replacing pads or rebuilding a caliper, the OEM illustration shows the stack-up order. One wrong shim and you’ve got a dragging brake that cooks the axle oil. I’ve torqued enough brake bolts to tell you – trust the factory callout, not your memory.

Air brake lines are listed on page 164. The routing diagram is there, including the check valve and drain valves (page 168 for the drain valve on the air tank).

Valve Assemblies – Air Application and Clutch Cut-Off

Air application valve assembly (page 174) – that little unit controls the brake application pressure. If it sticks, you get a harsh lockup or a pedal that goes to the floor. The catalog gives you the valve body, diaphragm, and spring part numbers. Same for the clutch cut-off valve (page 160). That valve disengages the transmission when you hit the brakes. If it fails, you’re dragging the drivetrain through every stop. The OEM page shows the seal and plunger kit. Cross-reference that against any aftermarket manual and you’ll find wrong thread pitches or missing O-ring grooves. I’ve seen it happen. Don’t cheap out on a valve that keeps the loader from rolling through a jobsite.

Engine and Transmission Components

This catalog covers the 3500 MKII turbo diesel – crankshaft, cylinder block, cylinder head, and all the rotating assembly parts. Pages 14 through 20 show the block and head. Timing gear train, oil pump, and engine controls (pages 66, 68) are all broken down. For the transmission, the charging oil pump is on page 111, and the dipstick and oil cooler lines on page 124. If you need the drive shaft group, pages 125–128 give you the flange sizes and bearing part numbers. Every spec is keyed to the serial number range (11Y03501-UP, 16L03501-UP, 23M03501-UP). Make sure you match your machine’s serial number before ordering. The manual tells you where to find it – on the left side of the bonnet.

Electrical System and Wiring

Alternator mounting (pages 292, 294), batteries and cables (page 276), back-up alarm (page 282), and dash lights (page 286). The wiring diagrams aren’t in this catalog – it’s a parts catalog, not a circuit manual. But the part numbers for connectors, relays, and switches are listed. If you need the cab heater, defroster fan, or rear window components, those are in the cab section (pages 302–322). For the bucket leveler automatic kit, see pages 216 and 220. Hydraulic control valves on page 236. Everything is indexed alphabetically from the front – “Air Application Valve Assy” to “Batter…”. No fluff, no generic parts substitutions.

3 Reasons to Choose OEM Documentation

First reason: aftermarket catalogs often use generic part numbers that don’t match the Fiatallis supersession history. This catalog lists the factory Part Number (usually an 8-digit code) that Fiatallis assigned. Second reason: the illustrations show the exact orientation of seals and spring-loaded components. A generic drawing might flip the check valve spring. Third reason: the serial number breakpoints. This catalog specifies which machines got a different air compressor or brake cylinder. If you order blindly from an aftermarket list, you’ll get the wrong part for machines built after a certain serial number. I’ve wasted half a day swapping a transmission charge pump because the cross-reference was off by a year. This 1990 edition captures the production updates up to that date.

If you need related manuals for other Fiatallis models, check out Fiatallis HD-9 1989 Parts Catalog – OEM Factory Specs, Fiatallis HD-6A, HD-6AG, HD-6B, HD-6E 1989 Parts Catalog, and Fiatallis HD-21 1990 Parts Catalog – Crawler Tractor Parts Manual. For an overview of the heavy equipment industry and how OEM parts catalogs fit into repair workflows, see Automotive Industry Overview and Automotive Industry Overview.

Does this catalog include torque specs?

No. This is a parts catalog, not a service manual. It lists part numbers, exploded views, and ordering information. You’ll need the separate service manual for torque values.

Will this fit my 645-B built after 1991?

The catalog covers serial numbers 11Y03501-UP, 16L03501-UP, and 23M03501-UP as of the 1990 reprint. If your machine’s serial number is higher, some components may have been updated. Check the supplement pages – the catalog includes revision notes.

Can I use this to order brake pads for the front axle?

Yes. The brake assembly page for the front axle (page 152) lists the pad, piston, and seal part numbers. Match your axle serial number to confirm.

What about the clutch cut-off valve – is it covered?

Page 160 shows the clutch cut-off valve assembly with all components. It’s an air-controlled valve that disengages the transmission when you depress the brake pedal. The part number for the valve body and diaphragm are listed.

Stop wasting billable hours chasing parts that don’t fit. Get the real numbers from the source that built the machine. Access the Factory Manual now – 369 pages of OEM part data, serial-number-verified, ready to print or view on your tablet. Your parts counter will thank you, and your loader will be back on the job tomorrow.