Hitachi NEXT Series Instruction Manual page 98

9. MAINTENANCE [How to Service the Air Compressor]
Water-Cooled
Cleaning of Cooler (Annually)
9
● Oil cooler
Scale removal
Remove the oil cooler water chamber cover. Flush
with scale remover and use a brass wire brush to
remove the scale from the inner surfaces of the oil
cooler tube nest.
● Intercooler/Aftercooler
If scale build up occurs often, contact the local
HITACHI distributor/master dealer or representative
office for scale removal.
96
Wire brush
Oil cooler