Hyundai HL970A Operator's Manual page 51

Regular lubrication (during storage)
Breaking the lubrication film on parts may cause
abnormal abrasion during the next operation.
Start up the engine once a month, perform all of the
functions, and apply lubrication oil to every part.
Check the level of the engine oil and coolant when
starting the engine up, and top them up if necessary.
Thoroughly wipe off any rust-proofing oil from the
cylinder and piston rod.
Sufficiently warm up the engine after starting the engine,
and repeat operation of the attachments several times to
wear in the parts sufficiently.
Fully charge and store the battery.
Store the battery separately for a long period of time
under extremely cold weather conditions.
Check the tire pressure.
1-31