Hitachi NEXT Series Instruction Manual page 78

9. MAINTAINING THE DSP [How to Service the DSP Air Compressor]
Check Safety Relief Valve Operation – (Bi-Annually)
3
Rear-Left-Upper Cover
Lever of
Safety Relief Valve
Lever of
Safety Relief Valve
Oil - (replace every 8,000 operating hour or 2-year, whichever comes earlier)
4
Oil port cover
Oil pan
Oil drain valve (1)
76
Rear- Center
Cover
Oil Cooler
Oil pan
Oil drain valve (2)
① Maintain the rated maximum discharge pressure of
the DSP (0.75, 0.86, 1.0 MPa (110, 125 145 psi)
whichever is applicable).
② Remove the rear-left-upper cover and rear-center
cover, and pull the lever of safety relief valve.
③ Verify that the safety relief valve operates properly
and let go the lever of the safety relief valve.
Some models are equipped with the safety relief valve
without the chain. For checking the safety relief valve
operation of these models, turn the top cap of the
safety relief valve anti-clockwise to blow. After check-
ing, turn the cap clockwise and close it.
WARNING
During inspection of the operation of the safety
relief valve, use the appropriate facial protec-
tion. High pressure air containing dust particles
can cause severe injury.
① Place a oil receiver under the oil-draining valves
(1, 2), remove the oil.
② Replace the lubricating oil twice a year and clean the
bottom of the oil casing once a year. Wipe away the
sludge that builds up on the bottom of the oil pan of
the oil casing with a sponge and replace with new oil.
③ Remove the oil filling port plug, and fill the oil until
the oil reaches the upper red line of the oil level
gauge.
④ Check the Filling port and oil-draining valves (1, 2)
are surely seated.
WARNING
● Change the oil regularly, as instructed in the
standard maintenance schedule (
68-71). Neglecting to change the oil causes
oil deterioration that could result in clogging
of the oil strainer and a fire.
● Be sure to use the recommended lubricating
oil given on page 7. Absolutely DO NOT mix
different types of lubricating oil.
● Overfilling with lubricating oil may increase
shaft power and result in rise in oil tempera-
ture. Do not overfill with lubricating oil.
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