Possible scam via ExplorOz 'Trader' adverts

I recently listed my near new Yamaha generator in the ExplorOz trader section under the 'camping gear' heading.
It wasn't long before I had an answer from someone wishing to buy it. We agreed a price and I sent them my address and a pic of the unit.
Today, I received this email from the 'intending purchaser':-

"Thanks for the email in response to my inquiry on
your(Generator Yamaha EF1000is) for sale.I have contacted my client
concerning the description you gave me and the price
you are also offering to sell which he satisfied
with. Arrangement has
been made for the( Generator Yamaha EF1000is) to be paid for and the
Certified Cashier's Check of is $3,530 . will be
issued out to you.All you have to do to deduct the
cost which is is ,$1,030 .. and then you transfer
the remaining balance through Western Union Money
Transfer to the Shipping company who are to come for
the pickup and handle the shippment and
delivery.These balance is for the pickup,shipment
and delivery cost.All you have to do for payment
to be issued out
Full Name:
Address :
City:
State:
Zipcode:
Country:
Tel# Home,Cell and Work Phone numbers ........
So i'll be expecting to read from you with the
requested
informati on,so that the check can be sent out to
you as soon as
possible.
mr john"

Has anyone else experienced this type of situation please. Assuming it is a scam, I don't understand how they make any money out of it. I haven't been asked for Bank Account or credit card details.

Dave