Billiesuki, it does indeed have a gear box oil thingy grin

Just top it up via the dipstick, use Castrol Hypoy C80/90 or equivalent.

Seeing as it appears that the gear box oil has never been changed, now might be a good time to do it (see pic 2)

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From the rear of the machine undo the 4 bolts that hold the back plate on (it makes it easier) and you will see the drain plug (arrowed), drain oil after driving around to get it hot.

From memory it takes around 600 - 700ml so you only need to purchase 1lt.

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Now as far as the maintenance manual manual goes there is none as such, the most I have been able to find is from this guy (Terry) on ebay:

http://www.ebay.com.au/itm/Deutsche...pt=AU_Lawnmowers&hash=item4d2a89e227

He has compiled notes from his experience with Deutschers over the years and they actually cost you nothing, so are well worth getting plus he has hard to get spare parts if required.

Any other questions, just ask and I and others will attempt to do our best for you.

Regards
Buckets