Oil Pressure Relief Valve Compatible With 1997-2006 John Deere 6310/6400/6410/6500 3029/4045/6068

JOHN DEERE TRACTORS:
• John Deere 5200/5210/5220/5300/5310/5320/... 3029/4045 PowerTech Diesel (1997-2006)
• John Deere 6200/6210/6300/6310/6400/6410/... 4045/6068 PowerTech Diesel (1997-2003)

JOHN DEERE BACKHOE LOADERS:
• John Deere 310E/310SE/315SE 4045 4.5L Diesel (1997-2003)


IMPORTANT:
This is an OIL PRESSURE RELIEF (regulating) valve for John Deere PowerTech 3029, 4045, and 6068 engines — it limits maximum oil pressure to protect bearings and seals. Do NOT confuse with fuel pressure relief valves or suction control valves — those are fuel system components. RE505501 fits earlier-generation PowerTech engines (1997-2003 era) used in 5200/5300/5400/6200/6300/6400-series tractors and 310E/310SE backhoes. For later PowerTech engines (2001-2007 era in 6x20/7x20 tractors), see RE516335 — the two are NOT interchangeable.

Symptoms of a failing oil pressure relief: pressure too high at cold start (stuck closed) or too low at hot idle (stuck open/worn spring), fluctuating gauge readings, and oil leaks around the valve. When replacing, inspect the bore for scoring and clean debris from the seat. Replace the O-ring. Low oil pressure can also indicate a worn oil pump, clogged pickup screen, or excessive bearing clearances — diagnose the root cause before replacing.

⚠️ Confirm engine generation — RE505501 vs RE516335 are NOT interchangeable.