Description

GEHL 6620 Parts Catalog – Factory OEM Manual for Skid Loader

Ever had a job go sideways because you ordered the wrong part? I have. Spent an afternoon with a GEHL 6620 that wouldn’t move because someone swapped a gear pump without checking the serial number break. A parts catalog like this one stops that. 76 pages of part numbers, exploded diagrams, and hardware callouts. This isn’t a generic aftermarket reprint—this is the original factory Parts Catalog from GEHL. If you’ve ever fought a part that didn’t fit because the manual skimped on the revision letter, you already know why OEM matters.

Decal Locations and Chassis Components

Pages 2-5 show every decal, including model and serial number placement. The manual tells you exactly where to find the serial number: inside the right chassis riser, between the lift arm and lift cylinder. That’s the kind of detail that keeps you from hunting for an hour. The chassis section (pages 6-7) covers the fuel tank, grill, and access covers. Need the part number for a fuel cap? It’s listed with the exploded view. No guessing.

Engine & Related Components: What You Get

Pages 14-15 break down the Engine and related components. All part numbers for the block, head gasket, injection pump, and fasteners are there. The manual uses callouts for hardware like cap screws and lock nuts—grade 5 or better unless noted. If you’re tearing down a GEHL 6620 to rebuild the top end, this saves you from ordering a bolt that’s one grade too soft. this Wikipedia article on diesel engines has general background, but for specific part numbers, you want this catalog.

7 Major Systems Covered – From Electrical to Hydraulics

The catalog covers seven major system groups: Chassis/Fuel, Axles/Drive Chains, Electrical, Engine, Air Cleaner/Muffler/Radiator, Hydraulic Pump/Control Valve, and Hydrostatic Drive. Pages 12-13 cover Electrical components—alternator, wiring, horn kit, and backup alarm. If you’re chasing a no-start on a 6620 and need the correct starter solenoid part, this is where you find it.

Get the Right Torque Specs – Inside Back Cover

Hardware torque specifications are printed on the inside back cover. Also includes an attaching hardware table. Those torque values are OEM factory numbers—not some forum post. If you’re installing a hydraulic pump or cylinder, you need to know whether that bolt gets 45 ft-lb or 60. The manual has it. this Wikipedia article on diesel engines won’t tell you that; this catalog will.

Hydraulic System: Valve, Pump, and Cylinder Parts

The hydraulic components section (pages 18-27 and 37-46) is dense. Covers the single gear pump, dual gear pump (optional), hydrostatic drive, lift/tilt cylinders, and the Valve assembly—main control valve, differential relief, self-leveling valves, solenoid valve. Serial number breaks are clearly marked: units before SN3301 vs. after SN3300. If you order the wrong part for the wrong serial range, you waste time. This catalog eliminates that risk.

76 pages of parts listings. That’s it. No fluff.

Related Manuals for Other GEHL Models

If you work on multiple GEHL machines, check these related parts catalogs:

• GEHL SL4640, SL4840, SL5640, SL6640 2005 Parts Catalog
• GEHL SL7610, SL7710, SL7810 2005 Parts Catalog – OEM Factory Specs
• GEHL RS6-34 2013 Parts Catalog – Factory OEM Manual

Does this catalog include engine overhaul torque specs?

No. This is a parts catalog, not a service manual. It lists part numbers and exploded views, not assembly torque sequences. You need the service manual for that.

How do I know if a part fits my GEHL 6620 with a serial number after SN3300?

The manual includes serial number breaks throughout. For example, the auxiliary hydraulics section has separate pages for units before SN3301 and after SN3300. Always check the serial number on the decal inside the right chassis riser (page 2). Cross-reference that with the parts list. The catalog also has a numerical index (pages 65-72) to find any part number fast.

Stop wasting time on wrong parts. Access the Factory Manual for your GEHL 6620. Have the correct part number in your hand before you call the dealer.