Clean Cooler (Annually) - Hitachi NEXT Series Service Manual

4.8 Clean Cooler (Annually)

Air-Cooled
Front panel
Front door (1)
Maintenance cover (4)
Maintenance cover (1)
Rear panel (3)
Water-Cooled
Wire brush
Maintenance
cover (2)
Instrument
panel
Front door (2)
Front frame
Maintenance cover (3)
Magnet rubber
Rear panel (2) Rear panel (1)
Oil cooler
For light and non-greasy dust particle
1
① Remove the front door and panel and rear panel
[Ref.No. 904, 905, 906, 944, 953, 911, 912, 913].
② Remove the maintenance cover (1)(2)(3)(4).
③ Use an air nozzle to blow the cooler surfaces.
For heavy and greasy dust particles
2
(detaching the cooler)
① Remove the enclosure panels.
② Drain the oil from the system.
③ Disconnect all the sensor wires from the cooler.
④ Disconnect all air / oil pipes at the joints.
⑤ Disconnect the discharge pipe.
⑥ Loosen and remove the cooler bolts.
For heavy and greasy dust particles
3
(cleaning the detached cooler):
① Use an air nozzle to blow the cooler surfaces.
② Soak the cooler in a detergent bath or spray
detergent onto the cooler. Use an air nozzle to blow
the cooler surfaces.
③ Generally, there are 3 kinds of dust and dirt particles.
・ Light dust particles
・ Heavy dust particles
・ Greasy dust particles
Contact the local HITACHI distributor/master
dealer or representative office for the detail.
● 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
H I T A C H I d i s t r i b u t o r / m a s t e r d e a l e r o r
representative office for scale removal.
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