John Deere’s GX335/GX345 operator manual OMM152805 I4 calls the GX345 a garden tractor and covers machines with PIN 120001 onward. Its GX345 engine section includes coolant and cooling-system service. If a listing calls the machine air-cooled, check the installed engine before ordering parts. The manual also has separate 48-inch and 54-inch mower specifications; it cannot tell you which deck is on a particular used tractor.
Match the manual to the tractor
Read the tractor PIN and engine identification on the machine before using a specification. If the PIN is below 120001, the I4 manual is outside its stated range; find a matching edition through Deere Manuals & Training. If a label is missing or the fitted engine differs from the book, resolve the discrepancy before selecting service parts.
Identify the installed mower
Deere’s June 2015 attachment archive lists a 48C Convertible Mower (SKU21354) and a 54C Convertible Mower (SKU21394) for the non-current GX335/GX345/GX355 group. The archive notes that the appropriate front draft arm assembly may need a separate parts order with a cartoned mower. These were historical field-conversion offerings. The list cannot identify the mower on a used tractor or confirm today’s inventory.
Look for the mower’s identification mark. Compare its mounting pieces, primary belt route and parts listing with that deck before ordering a belt, blade or attachment. A 48C or 54C label alone does not establish that every required mounting part is present.
Check a used GX345
- Record the tractor PIN, engine identification and mower identification. Ask the seller for clear label photos if you cannot inspect them in person.
- With the engine stopped and cool, check for visible coolant leaks, damaged hoses and missing radiator hardware. Follow the matching Deere manual for cooling-system service; never open a hot pressurized system.
- Inspect the deck shell, belt guards, spindle areas and front draft arm. Ask for a demonstration of the safety-system checks described in the correct operator manual.
The reviewed Deere pages do not support a universal horsepower, fuel-use figure, towing limit, slope angle or installed mower deck for every GX345. If the machine’s identifiers conflict with its paperwork, ask a Deere parts or service specialist to identify it before buying.