Hitachi NEXT Series Instruction Manual page 103

Oil-free rotary screw air compressor
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Main Motor Greasing
The main motor bearings must be greased as following
Grease following amount of RMS grease (Ref. No. 455)
(Raremax Super by Kyodo Yushi) .
● Contact the local HITACHI distributor/master dealer or
representative office for the grease detail.
● Greasing must be done while the main motor
● Cleaning of grease pan must be done while the air
compressor stops.
● Example of grease gun
Lever-type grease gun CH-400 Micro-Hose (pin type
SPK-1C) by Yamada Corporation
Grease filling amount
Operation condition
For 8,000 hours or less
Every 3
operating hours per year
For 4,000 hours or less
Every 6
operating hours per year
[Fixed-Speed type]
Load-side bearing
Grease port
Grease pan
Be cautious of replenishing grease more than the spcified amont. It may cause leaking of grease and/or
malfunction of the protective device due to overheat of the bearing. Grease at once during start-up
commissioning. Periodically replace the main motor bearing in accordance with
Maintenance of Compressor" and
Maintenance Schedule B .
9. MAINTENANCE [How to Service the Air Compressor]
Filling amount
Fixed-speed Variable-speed
Fill 2.3 oz
Fill 2.6 oz
(65 g) each
(75 g) on
on the load
the load
and opposite
Anti-Load-Side bearing
Grease port
Grease pan
"9.2 Standard Maintenance Schedule" Maintenance Schedule A
① Open the front door. Grease the specified amount
through the grease port using a grease gun.
② Check the grease pan, and clean the pan as necessary.
③ Close the front door.
The bearing on the opposite side is shield type; filling of
grease is not necessary on the opposite side.
Load-side bearing
Grease port
Grease pan
"9.1 Periodical

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