See Paul’s top tips on Vapormatic.com, this shows how to disassemble & and reassemble a John Deere water pump.
Kevin
September 2008
I'm assuming your pump is leaking from the seal.
This is uusually caused by worn bearings. Normally a press is needed to dismantle the impeller shaft. By the time you have sourced bearings, seals, and possibly impeller, you may find it quicker and easier to replace the pump.