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Trouble
symptom
Is
1
direction normal?
Is the ultimate pressure
2
of fore pump normal?
Pressure
Is there any leak in
does
not
3
system and piping?
lower.
4
Is the oil clean?
Casing inside and/or the
5
Rotor surface is dirty /
wet.
Is the oil level within the
1
level lines?
Any sound (clattering)
2
synchronized
Abnormal
rotating speed?
sound
Is roaring machine noise
3
always heard?
1
Is cooling water flowing?
Is the operating pressure
2
normal?
Abnormal
heating
Is discharge pressure
3
normal?
4
Is rotor rotation resisted?
Check item
motor
rotating
Reverse rotation.
Pressure is above
the
value.
In normal operation. Leak test of piping.
Oil color is opaque
and whitish (turbid).
There are attached
substances, or wet.
Oil level is below
the level line.
with
Clattering is heard.
Roaring
heard.
Flow rate is below
the
value.
Pressure is above
the
pumping pressure.
Discharge pressure
is
specified value.
Rotors do not rotate
by inertia.
49
Criteria
Corrective action
Check power cable and
connecting terminals.
prescribed
Change the fore pump oil.
Change oil.
Overhaul
（Cleaning, clearance
adjustment）
Replenish oil.
Disassemble and repair
the pump.
(Re-adjust timing.)
Disassemble and repair
noise
is
the pump.
(Replace
gear.
Check
prescribed
piping.
Check pressure on intake
maximum
and exhaust sides.
Check the fore pump.
above
the
Check the fore pump.
Overhaul.
YO99-0874-DI-002-18
bearing
and
cooling
water
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