Just got my R4047 back from the dealer. Seems like the front wheel bearing or housing may be a weak link on these tractors. His notes on the repair bill:
"Oil leaking near right front wheel. Remove wheel, oil leaky at axle, play in axle bearings, check left side, seems tight. Remove outboard planetary hub. Disassemble hub/axle. Outer bearing broken and collapsed, seal damage. Damage on hub and axle at outer casting rib. Clear up damage (burrs), clean all parts, assemble hub with new bearings and seal. Clean metal from center axle right end. Install hub and wheel. Fill with oil. Run and check."