Description

GEHL 1639, 1649 Parts Catalog

Let me tell you something about parts catalogs. When I’m rebuilding a screed assembly on a PowerBox paver, I don’t have time to guess which seal kit fits the track adjust cylinder. You order the wrong part, the machine sits dead, and the customer is breathing down your neck. That’s why this GEHL 1639, 1649 Parts Catalog sits on the bench at my shop in San Antonio. It’s 86 pages of factory-sourced part numbers, exploded views, and hardware specs that keep you out of the parts counter return line.

This is not a reprint or a third-party compilation. It’s the same document GEHL sent to dealers when these machines were new. You get the exact decal layout, the wire harness hookup for both the 1639 gas engine and the 1649 diesel engine, and every hydraulic line group from the reservoir to the screed vibrator motor.

GEHL 1639, 1649 Parts Catalog: Find Any Part by Section

The manual splits into four sections: General, Chassis, Hydraulics, and a Numerical Index. If you need the decal for the backwall or the hopper, flip to General Section pages 1-3 and 1-6. Need a replacement screed lift cylinder? That’s in the Hydraulics Section under the cylinder group list. Every component group is laid out with an illustration and a bill of materials. The part numbers are the real GEHL numbers – not cross-referenced aftermarket junk that fits “maybe.” You order using these numbers, the parts show up and they bolt right on.

Decal Locations – Why They Matter

I’ve seen guys ignore decals because they think it’s just stickers. When a paver leaves the factory, those decals show critical hydraulic line routing, safety warnings, and grease intervals. This catalog maps each decal to its exact position on the lower frame, hopper, screed, and backwall. If you’re replacing a damaged decal or putting together a machine from a bare frame, you need this reference. Otherwise you guess, and guessing means a line gets hooked up wrong and you lose an afternoon bleeding air.

7 Systems Covered in the Hydraulics Section

The hydraulics portion of this catalog isn’t a generic diagram. It breaks down seven major subsystems: drive tracks, screed, augers, gates, hopper, and the individual cylinders and pumps. You get separate pages for the front piston pump and rear gear pump, the track drive motor and torque hub, the auger drive motor, and the screed vibrator motor. There’s even a dedicated page for the 7-stack control valve with relief and the steer valve. If you’re rebuilding the hydraulic plumbing on a 1649 diesel unit, you need the routing diagrams from pages 3-0 through 3-44.

Gas vs. Diesel: Two Engine Groups

Not every paver runs the same powerplant. The 1639 uses a gas engine; the 1649 uses a diesel engine. This catalog treats them separately with distinct parts groups in the Chassis Section. The gas engine group starts on page 2-12, the diesel group on page 2-14. Plus, the wire harness hookups are different between the two models – pages 2-18 and 2-20. If you’re swapping an engine or chasing an electrical fault, these diagrams save you from cutting the wrong wire. For a deeper dive on diesel fundamentals, see this Wikipedia article on diesel engines, but for part numbers stick with the factory source. this Wikipedia article on diesel engines can explain how a compression-ignition cycle works; this catalog tells you which injector seal to order.

What Torque Values Are Listed?

Standard attaching hardware torque values are printed on the inside back cover of this catalog. It covers Grade 5 cap screws and Grade A hex nuts. If the manual calls for a specific fastener – like a cap screw that’s Grade 5, cadmium plated – you use that spec. Anything else and you risk stripping threads or pulling a load out. I don’t care if you’ve been wrenching for twenty years; you need the torque table because every bolt has a limit.

Use the Numerical Index to Order Parts

Back of the catalog is a numerical index (Section 4) that lists every part number in the book with its page reference. You look up the number, find the page, and see the illustration. No flipping back and forth guessing. Combine that with the serial number plate location – stamped on top of the control panel housing and on the left top backwall plate – and you can order parts for your exact machine. The manual even explains the serial number breakdown: month and year codes like N=97, P=98, Q=99, etc. That matters because engineering changes happen, and you want the parts that match your build date.

Related Manuals

• GEHL 1639, 1649 Operators Manual for Power Box Paver – Factory Specs
• GEHL SL4640, SL4840, SL5640, SL6640 2005 Parts Catalog
• GEHL SL7610, SL7710, SL7810 2005 Parts Catalog – OEM Factory Specs

Frequently Asked Questions

Does this catalog include wiring diagrams?

No. This is a parts catalog, not a service manual.

How do I find the correct part number for my 1649 diesel engine?

First, locate your unit serial number from the plate on the control panel housing or the left top backwall plate. Then open the Chassis Section to the 1649 Diesel Engine Group on page 2-14. That page has an exploded view of the engine with callouts and a numbered parts list. Cross-reference the part number you need with the Numerical Index in Section 4 to verify the page. The index also lists every part in alphabetical order – piston, ring, gasket – so if you know the name but not the number, start there. Always specify the full part number, description, quantity, and your unit serial number when ordering. This catalog uses GEHL’s original part numbering, so if you give a dealer that number they’ll know exactly what you need. Don’t rely on memory; one wrong digit and you get a different piston diameter.

Bottom line: if you own a GEHL 1639 or 1649 PowerBox paver and you plan to keep it running past the first hydraulic leak, you need this document. Access the Factory Manual now and get the right part numbers, torque specs, and decal locations that keep your machine on the job.