Description

GEHL 502 2007 Parts Catalog – Factory Part Numbers and Torque Specs

If you are turning wrenches on a GEHL 502 compact excavator built between serial number AB00473 and AB02974, you have two options: guess which part number fits and hope aftermarket cross-reference charts are close, or buy a Parts Catalog that came off the same printer as the units leaving the factory. This 2007 edition runs 152 pages and was printed in July of that year. It lists every nut, bolt, seal, and hydraulic fitting used on those machines. I have seen too many guys order a seal kit that did not fit because they read a column wrong on some online parts finder. That stops here.

The manual opens with a note about torque values — standard attaching hardware torque specs sit near the back, and metric values in the illustrations are given in Newton-meters. Multiply by 0.738 to get foot-pounds. GEHL specifies Grade 8.8 cap screws and bolts unless noted otherwise. If you are used to throwing a wrench on a hydraulic line and calling it tight, you are going to want the factory numbers from the Hydraulic Fitting Data chapter. Page references for torque are actually spread through the Hydraulic Fitting Data section and the Torque Specifications chapter. Use them. Leaks on a 502 cost time on the job site.

Torque Specifications – Why the Factory Values Matter

Aftermarket manuals sometimes list generic torque values that work for a class of machines but not for this specific model. The GEHL engineering team designed the 502 with specific fastener grades and tightening sequences. The Torque Specifications chapter in this catalog gives you standard attaching hardware values. Need the charge pressure or cylinder end torque? That is in the illustrations. Do not substitute. A stripped bolt in the swing gear housing turns a ten-minute fix into a full teardown. I have watched it happen.

Does This Manual Cover the Entire Compact Excavator?

Yes. Every system is accounted for in the exploded view illustrations: engine, hydraulics, undercarriage, boom, cab, and controls. The parts list follows each illustration with reference numbers. Some reference numbers are circled — that means the part is a complete assembly. A small bag icon in the drawing indicates a seal kit (o-rings, seals, etc.). The serial number breaks are clearly marked. For example, the introduction shows how to read notes like “(SN 999 and before)” or “(SN 1000 – 2000)”. If your machine has a serial number outside AB00473 to AB02974, Gehl 502 2007 Parts Catalog will not cover it. Check the matching serial range before you buy.

152 Pages of Indexed Part Numbers

Half the battle in a parts lookup is knowing where to start. This manual front-loads three indexes: an Alphabetical Index (Numerics through M, then M through V), and a Numerical Index. That means you can look up a component by name or by the number you see stamped on the existing part. The pages are tight — every entry includes a full description, quantity, and the GEHL part number. No room for translation errors. You order by that number, it fits. GEHL 502, 602, 652 Service Manual – Factory Specs for Compact Excavators is the companion service manual for repair procedures; this is the parts catalog alone.

Locate Parts Fast with the Alphabetical and Numerical Index

Open to the Alphabetical Index. Say you need a new fuel injector line. Look under “Lines” or “Fuel” — the index points you to the illustration page. Every component has a reference number that ties back to the parts list. The Numerical Index works the same way if you already have a part number off the old piece. You skip the guessing. For those of us who keep a beater 502 running on a farm or small job site, this index alone saves an hour per part lookup.

Hydraulic Fitting Data: Not Just a Torque Spec

Hydraulic leaks on a compact excavator are not a minor annoyance — they drop pressure and ruin a day of digging. The Hydraulic Fitting Data chapter gives you the exact tightening specs for every O-ring face seal, JIC flare, and pipe thread used on the 502. It also lists the fitting type and size. If you are replacing a hose and do not have the factory data, you risk over-torquing a fitting and cracking the port. That repair costs more than the hose. This chapter keeps you inside the safe window. GEHL SL4640, SL4840, SL5640, SL6640 2005 Parts Catalog is a different model line — do not mix them up.

Who Needs This Catalog?

If you own a GEHL 502, you are the primary audience. But the manual is also useful for a shop that services compact excavators and wants to be sure of part numbers before ordering. A DIYer doing a full undercarriage rebuild needs the factory part numbers for rollers, sprockets, and tracks. That data is not available in aftermarket catalogs with the same accuracy. The manual also gives you the abbreviation list (e.g., CS for cap screw, HLN for hex lock nut) so you can read the parts list without guessing.

Source Validity – Why This Beats a Third-Party Reprint

This is an original GEHL publication, not a scan of a scan. The PDF comes from the same files that went to the printer in 2007. It carries Form Number 918040, Revision C. Aftermarket parts books often delete pages, compress illustrations until part numbers are unreadable, or merge serial ranges to save space. You lose accuracy. I have had more than one tech hand me a reprint that was missing the entire hydraulic section. With this factory manual, every page is intact. You can verify the torque for a hydraulic fitting from the Hydraulic Fitting Data chapter against the actual fitting on the machine. That is the difference.

For background on the diesel engine that powers the 502, see this Wikipedia article on diesel engines for general principles. But for specific part numbers, you need the factory catalog. this Wikipedia article on diesel engines covers theory; the parts catalog covers reality.

Frequently Asked Questions

Does this catalog include service procedures?

No. This is a parts catalog only. It lists part numbers, quantities, illustrations, and torque values. Repair steps are in the service manual.

What serial numbers does this cover?

AB00473 through AB02974. Check your machine’s serial tag on the front cab panel before ordering.

Are the torque values in the illustrations in foot-pounds or Newton-meters?

Metric torque values in the illustrations are given in Newton-meters. The manual states to multiply by 0.738 to get foot-pounds. Standard attaching hardware torque values are also provided near the back of the manual. I suggest using a calibrated torque wrench for every bolt that holds pressure. A click-style wrench is fine for most jobs, but a beam type is better for low-torque hydraulic fittings where over-tightening distorts the seal. I have seen more leaks from overtightened O-ring face seals than from undertightened ones. Set the wrench to the converted value from the manual and stop there. Do not add extra “just for safety.” That extra quarter turn is what cracks the boss. The factory spec is the factory spec.

Can I use this part number to order from a dealer?

Yes. GEHL dealers will accept these part numbers. The catalog uses genuine GEHL service part numbers.

You can stop guessing part numbers and cross-referencing aftermarket charts. Access the Factory Manual and put the correct part on the machine the first time. Your time and the excavator’s hydraulics will thank you.