Description

FMC Bolens 1666 Parts Catalog

I’ve been wrenching for 28 years. You learn quickly that the difference between a job that goes right and one that spirals into a parts-swapping nightmare is the difference between an OEM parts catalog and a blurry PDF scraped off some forum. This FMC Bolens 1666 Parts Catalog is the real thing – 23 pages of factory-sourced part numbers, reference numbers, and exploded diagrams. If you’re working on a Bolens 1666 16 HP tractor and you’re trying to figure out which spring leaf or which decal goes where, this is the only piece of paper you want on the bench.

You get a full parts list organized by assembly. Page 2 for example shows the trim assembly with every screw, washer, and bracket called out by reference number. The catalog uses a numbering system that matches the original Bolens production line – no aftermarket renumbering, no guesses. Each part has a factory part number, a description, and the quantity required. That matters when you’re ordering seals or bolts and you don’t want to end up with the wrong thread pitch.

What’s Inside the 23 Pages

The catalog breaks down the entire 1666 tractor into numbered assemblies. You’ll find sections for the hood and grille assembly, the rear fender assembly, seat support, and the trim assembly. Every part gets its own reference number – look at the left column, cross it to the diagram. Page 1 shows the trim assembly with an exploded view; the parts list runs across two columns. Part numbers like 1728212 (acoustical foam) or 1100065 (capscrew, 3/8-16 x 3/8) are listed with the exact hardware specs. No generic “bolt” listings – it’s the specific length, thread, and head type Bolens used at the factory.

Audience: Who Needs This Catalog

If you’re a home garage mechanic trying to restore a Bolens 1666 or keep one running for mowing, you need this catalog. Professional shop owners – you know the value of having factory part numbers on hand so your guys aren’t wasting billable hours measuring bolts on the floor. Beginners: don’t try to order parts off a hardware-store PDF. This catalog gives you the exact number to give your dealer or to search online. I’ve seen too many guys buy the wrong seat retainer because they guessed – 1725626 is the seat retainer, but 1725624 is the decal. That’s the kind of detail you get here.

3 Reasons to Stick with OEM Documentation

First, every part number in this catalog was used by FMC Bolens when they built the 1666. Second, the illustrations are drawn from the actual manufacturing drawings – the way Bolens intended the tractor to be assembled. Third, aftermarket catalogs often merge part numbers from different model years or skip the hardware like lockwashers and pop rivets. Page 2 lists those rivets (1287472, 3/16) and even tells you how many – six for the clip, seven for the cover. You don’t get that kind of precision from a reprint house.

Parts List Breakdown: Trim, Hood, Fender, Seat

The catalog covers four main assemblies. The trim assembly (Figure 1) includes the acoustical foam, side panels, grille and hood assembly in multiple variations – note the (1), (2), (3), (4), (5) designators that indicate which sub-model or revision. The rear fender assembly has five versions, each with its own part number: 1725401, 1729345, 1733077, 1732839, and 1754839. The seat assembly lists seat supports, seat base, pivot blocks, and even the spray paint codes – NI 1735222 black, 1735223 white. That’s useful if you’re repainting the deck or engine tin. The hood and grille section shows the 1/4-turn studs, grille screen, and decal set including the R.H.D. identification decal. Every decal is called out – even the instrument panel decal gets its own line (1727204).

Related manuals you might need: FMC Bolens 1660 Tractor Parts List with 16 HP Kohler Engine and FMC BOLENS Tractor 10 HP Model 1055 Parts List. For service procedures, the FMC HCD-80B Service Manual Index covers the hydrostatic drive system. If you want context on why factory documentation matters in the wider automotive industry, check this Automotive Industry Overview or Automotive Industry Overview.

Does This Catalog Cover the Fuel System?

No. This is a parts catalog, not a service manual. It lists the part numbers for fuel-related components like the seat support stand or the actuator bracket, but it doesn’t include torque specs or adjustment procedures. For that you’d need the shop manual. But if you need to order a replacement carburetor gasket or a specific lockwasher, this catalog is where you find the correct number.

Source Authenticity: OEM vs Aftermarket

This is a direct scan of the original FMC Bolens factory publication. You are not getting a generic compilation from a third-party vendor. The page numbering, the part number prefixes, and the reference numbers match the microfiche Bolens dealers used in the 1970s and 1980s. Aftermarket “universal” parts lists often omit the hardware or group parts differently – this catalog doesn’t. Each sheet has the original Bolens logo and part number format. That’s the difference between ordering a part that fits and ordering one that kind of looks like it might work.

Is this catalog a reprint of a later edition?

No. This is the factory original – 23 pages, no reprint, no copy. The same document Bolens dealers used.

What if I need a part number that isn’t listed here?

The catalog covers the 1666 model with its sub-variants (1 through 5). If your tractor has been modified or you own a different model, you’ll need the corresponding catalog. For the 1660 with Kohler engine, see the FMC Bolens 1660 Tractor Parts List with 16 HP Kohler Engine. If your part is not found, check the illustrations carefully – sometimes the same part is used across multiple models but listed under a different reference number. You can also cross-reference with the FMC Bolens 1666 Parts Catalog online at AutoRepairManuals – if you still can’t identify it, post on a Bolens forum with the assembly diagram from this catalog and someone will confirm.

The factory catalog is the backbone of any correct restoration. Access the Factory Manual to get the exact part numbers, illustrations, and hardware specs that FMC Bolens put on paper. Once you have it, you can order parts with confidence.