Description

GEHL CB750 Parts Catalog – Factory OEM Documentation for Your Forage Harvester

You know the drill – you’re pulling apart a cylinder assembly or chasing a bad bearing in the feed rolls, and the part number you have doesn’t match anything in your bin. Or worse, you order a seal kit from memory and it’s wrong because the serial number split on your CB750 is before #3851 and the parts changed. That’s exactly why you need the GEHL CB750 Parts Catalog in your hand, not a generic aftermarket list that guesses at part numbers. This is the same 60-page book that GEHL shipped with the machine – no reprints, no third-party reinterpretations. Every exploded view, every part callout, every hardware grade and torque spec came off the factory floor.

I’ve been wrenching on ag equipment since before some of you were born, and I can tell you that skipping the parts catalog is how you end up with a pile of wrong bearings and a machine that sits for days. This manual gives you the exact part number for every nut, bolt, washer, and subassembly on the CB750 forage harvester. Page 10-13 shows the Cylinder & Cutting Mechanism in two serial number ranges: used after serial #3850 on pages 10-11, and before serial #3851 on pages 12-13. Miss that split and you’ll order the wrong knife set. The Shifter (SAC) Transmission section on page 20 is a single-page breakdown of that gearbox – clean, no clutter, just the parts you need.

Cylinder & Cutting Mechanism: Page 10-13 Details

If you’re replacing the cylinder knives or the cutting shear bar, you need to know which serial range your machine falls into. The manual splits it after serial #3850 so you get the correct knife set and mounting hardware. The exploded diagram shows every piece – from the cylinder drum to the stationary knife. Page 51 in the Accessories section lists the cylinder knife set part numbers, along with length-of-cut kits for 5/16″ and 1/8″ cuts. That’s the kind of detail you don’t get from a photocopied parts list from the internet.

What Does the Shifter (SAC) Transmission Section Cover?

One page, page 20, covers the whole shifter transmission assembly. It’s a SAC (Spicer/Allison type?) – but the manual doesn’t guess. It gives you the part numbers for the shift fork, gears, bearings, and seals. If your CB750 is hard to shift or pops out of gear, you’ll find the exact detent spring and shift rail parts there. No hunting through five different aftermarket catalogs.

3 Sections You’ll Reference Most Often

• Feed Rolls (pages 16-19): Two subsections – stationary & supporting parts (16-17) and rolls, sheets & roll drives (18-19). If the feed roll timing is off or the drive chain jumps, this is where you find the correct sprocket and bearing part numbers.
• Universal Drives (pages 24-27): Covers tubular drives (35 and 55 series), cylinder drive, and telescoping drives for both 540 and 1000 RPM PTO. If you need a U-joint or a driveline yoke, the parts are called out with dimensions.
• Standard Hardware Torque Specifications (Inside Back Cover): A chart of torque values for Grade 5 cap screws and hex nuts. Use it – don’t guess. Stripped bolts in the blower housing will cost you a day.

Serial Number Splits: Why You Need Them

GEHL made changes to the CB750 during production. The manual clearly marks every section with “Used After Serial #3850” or “Used Before Serial #3851”. For example, the Deflector & Cap controls change between those serial numbers – pages 30-31 for after, 32-33 for before. Ordering a hydraulic deflector cylinder without checking your serial number wastes money and time. The manual also includes the decal locations (pages 2-3) so you can verify your machine’s serial number decal placement.

Source Validity: OEM vs Aftermarket

This is a genuine GEHL Service Parts Manual, not a third-party compilation. The inside front cover tells you to specify model number and serial number when ordering parts. The abbreviation list on page 2 defines every fastener type: HHCS, HWHS, HWHTCS, etc. The attaching hardware table inside the back cover gives you the common hardware part numbers for cap screws, lock washers, and nuts. Aftermarket catalogs leave that out – they show a generic bolt and expect you to figure out the grade. This manual tells you it’s Grade 5, cadmium or zinc plated, hexagon nut Grade B. That matters when the torque spec is 85 ft-lbs on a 1/2” cap screw.

If you need parts for other GEHL models, check these related manuals: GEHL SL4640, SL4840, SL5640, SL6640 2005 Parts Catalog or GEHL SL7610, SL7710, SL7810 2005 Parts Catalog – OEM Factory Specs. For a compact skid loader, see GEHL RS6-34 2013 Parts Catalog – Factory OEM Manual. For background on diesel engine theory, read this Wikipedia article on diesel engines and this Wikipedia article on diesel engines.

FAQ – GEHL CB750 Parts Catalog

Does this manual cover maintenance procedures or just parts?

This is a parts catalog – exploded views and part numbers only. For service procedures you need the separate service manual.

What if my CB750 serial number falls between the two ranges?

The manual uses two splits: after #3850 and before #3851. If your machine is exactly #3850, use the “Used After Serial #3850” sections. The table of contents on page 1 tells you which page to use for each serial range. If you’re still uncertain, call GEHL with your serial number and they can confirm the break.

Are the torque specs for cylinder knives included?

Yes. The inside back cover has a standard hardware torque chart that applies to all Grade 5 fasteners. Specific torque values for the cylinder knife retaining bolts are not listed separately because they fall under the standard spec. Use the chart and tighten to the recommended ft-lbs.

Can I get this manual as a printed copy?

Access the Factory Manual – you get a digital PDF that you can print yourself or view on a tablet in the shop.

Stop chasing wrong part numbers. Access the Factory Manual now and keep your CB750 running without the headache of guessing which bearing fits your serial number range.