John Deere X500 Select Series Technical Repair Manual (X500-X540, TM2309)

Identify your engine before you order parts or set specs, because this book carries three complete engine sections and the numbers differ hard between them. The manual states the X500 runs the Kawasaki FS730V air-cooled twin, 726 cm3. Also covered in full are the Kawasaki FH721V air-cooled V-twin (675 cm3) and the John Deere K-Series FD731V, which is liquid cooled with a 2.7 L cooling system. Minimum compression is 390 kPa (57 psi) on the air-cooled engines but 682 kPa (99 psi) on the FD731V - test an FD731V against the air-cooled spec and you will pass a tired engine. Valve clearances differ too: 0.05 to 0.10 mm on the FS730V versus 0.15 mm on the FD731V. Check the engine model plate first, then open the right section. p. 320

No, and this is the expensive mistake to avoid. The X500 and X520 transaxle takes 10W30 engine oil. The X534 and X540 take John Deere Hy-Gard. Capacity is 5.3 L (5.6 qt) on all models. Put the wrong fluid in a hydrostatic transaxle and you are looking at whining, weak drive and eventually a rebuild that costs more than the manual by a couple orders of magnitude. The Power Train section also gives you the wear limits when you are in there - transaxle thrust bearing is 1.45 to 1.55 mm new, replace at 1.30 mm. p. 839

The Hydraulics section (Section 60) has the exact check for this. Run the oil flow and pressure test: the deck should lift in 2 seconds at 2700 to 3000 engine rpm, and the relief valve should open at 4480 kPa, plus or minus 340 kPa (650 psi, plus or minus 50). Those two numbers split the problem for you: good pressure but slow lift points one way, low relief pressure points another. The section then covers the relief valve, control valve, hoses and fittings so you can fix whichever it turns out to be instead of throwing parts at it. p. 975

No. These are carburetted, cable-and-relay era machines - there is no ECU fault code table and no reset procedure to perform, so do not waste time hunting for one. Diagnosis on this platform is done the traditional way, and the manual gives you the numbers to do it: cylinder compression, engine oil pressure (minimum 69 kPa on the FH721V), stator AC output (28 V minimum at full throttle), starting motor draw (180 A maximum) and PTO clutch coil resistance (2.8 to 3.3 ohms). If the throttle or governed speed is off, that is a test and adjustment in the engine section - fast idle is 3600 rpm on the X500's FS730V and 3350 rpm on the FH721V and FD731V. p. 483

Full repair. Unlike a diagnosis-only book, every major section runs component location, theory of operation, diagnostics, tests and adjustments, and then complete disassembly and rebuild. That means engine internals with torque values (FD731V head bolts 32 N.m new or 25 N.m reused, flywheel 56 N.m), the hydrostatic transaxle down to the charge pump, final drive and axle, and the power steering including the cylinder, hoses and a performance test. Attachments coverage handles the mower decks, their drive and the lift linkage adjustment. p. 182