20
4. DAILY CHECK [Lubricant Management]
4.3.1 Oil level check
While the compressor is during the load operation,
check the oil level gauge for the amount of the lubri-
cant. When the oil level stays between upper and lower
red lines during the load operation, sufficient lubricant
exists in the system.
If the oil level is above the upper red line, the lubricant
is over filled. In this case, stop the compressor, and
make sure the oil separator tank internal pressure
gauge to check there is no residual pressure in the
compressor, disconnect the power, and drain the lubri-
cant from the oil drain port on the oil separator tank.
If the oil level is below the lower red line, the lubricant
is short. In this case, check the amount to be refilled
while the compressor is during the load operation.
(The distance between the two red lines measures 4
cm. After 0.73 liter of lubricant is added, the oil level is
increased by about 1 cm.) Stop the compressor, make
sure the oil separator tank internal pressure gauge to
check there is no residual pressure in the compressor,
disconnect the power, and refill the lubricant from the
oil filling port.
If the oil level in the shutdown state goes beyond the
upper bolt of the oil level gauge, restart the compressor
and stop it 7 to 8 seconds later. Now, you can check the
oil level in the shutdown state on the oil level gauge.
4.3 Lubricant Management
1
．
When deteriorated lubricant is used without replacement, some of it adhere to the Oil Separator
Element and accumulate heat caused by its oxidization. This may bring even fire in the worst case.
2
．
Change lubricant and Oil Separator Element constantly according to the standard given by the Typical
Maintenance Standard (
see p. 42-44). Deteriorated Lubricant may result fire to the Oil Separator
Element.
3
．
Use genuine synthetic oil (
NEW HISCREW OIL
NEXT
) for lubricant. Avoid use of other brand or mix use
with it.
Oil Separator Tank Internal Pressure Gauge
Oil Separator Tank
Drain Port
Upper Bolt of
Oil Level Gauge
Front Door
Oil Filing
Port
Oil Level Gauge
Upper
red line
Lower
level line
Item
Type
Oil level between
red lines
Oil replacement
quantity
OSP-55VAN
2.9 liters
（
0.73 liters / 1cm
）
26L
OSP-75VAN
36L
WARNING
CAUTION
●
Replenish the oil (genuine synthetic oil) periodically to maintain the proper oil level. Long time opera-
tion without the oil replenishment at low oil level, can cause the shorter oil life or oil deterioration.
●
Oil replenishment shall be carried out every 1,500 to 1,000 operating hours. Replenish amount might
be 1.8L (55kW), 2.4L (75kW) liters. (Actual replenish amount shall be determined by the oil level, as it
is varied by the load rate of the compressor.)
●
Sampling analysis of the oil at every 3000 hours interval is recommended. Earlier oil replacement
might be necessary, depending on the result of the analysis.
Consult HITACHI dealer for the sampling analysis.
Ask your dealer or Hitachi regional office for replacement
of the genuine synthetic oil (
NEW HISCREW OIL
NEXT
).
4 liters oil can: Part No. 063
20 liters oil can: Part No. 064
The genuine synthetic oil may get darkened due to its chem-
ical additives soon after start of use, but it is not abnormal.
IMPORTANT
