101
9. MAINTENANCE [How to Service the Air Compressor]
Load-side bearing
Grease port
Anti-Load-Side bearing
Grease port
Grease pan Grease pan
CAUTION
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
“9.1 Periodical
Maintenance of Compressor” and
“9.2 Standard Maintenance Schedule”
Maintenance Schedule A
Maintenance Schedule B
.
[Fixed-Speed type]
Grease pan
Load-side bearing
Grease port
● Example of grease gun
Lever-type grease gun CH-400 Micro-Hose (pin type
SPK-1C) by Yamada Corporation
Grease filling amount
Operation condition
Filling
frequency
Filling amount
Fixed-speed
Variable-speed
For 8,000 hours or less
operating hours per year
Every 3
months
Fill 2.3 oz
(65 g) each
on the load
and opposite
sides.
Fill 2.6 oz
(75 g) on
the load
side.
For 4,000 hours or less
operating hours per year
Every 6
months
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.
● Contact the local HITACHI distributor/master dealer or
representative office for the grease detail.
● Greasing must be done while the main motor
operating.
● Cleaning of grease pan must be done while the air
compressor stops.
IMPORTANT
The main motor bearings must be greased as following
table.
Grease following amount of RMS grease (Ref. No. 455)
(Raremax Super by Kyodo Yushi) .
13
Main Motor Greasing
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