HMP-1817E 6 (14/18)
Table 3. Causes and actions to be taken for general troubles on Coolant pump.
Trouble Cause Action
A) Coolant is not issued from
pump.
Rotating direction of motor is
wrong.
(Regular:
motor fan is clockwise.)
Stop the motor immediately,
then repair to correct direction.
Level of coolant is low. Fill coolant to upper limit of
level gauge.
Suction filter clogs. Clean the suction pipe or
suction filter.
If the clogging is too terrible,
please replace coolant with new
one.
Air is sucked from suction port. Check the amount of the
coolant is appropriate by level
gauge.
Repair the packing of pipe
connection or tighten the
fitting
sufficiently.
Pump shaft does not rotate. Check the motor fan can be
rotated easily by hands .
If it can not, the inside of pump
may be damaged.
B) Pressure does not increase. Set pressure of relief valve is
low.
Adjust to correct value by
precise pressure gauge.
Relief valve is stuck. Disassemble and clean the
pressure adjusting part, modify
or replace the components.
There is much leakage inside
circuit system.
Block the circuit in order, check
the components and modify or
replace the components.
C) Noise of pump Coolant in reservoir is foaming. Check if air is not sucked from
suction pipe.
Part of suction filter clogs. Clean suction filter.
D) Abnormal heat of pump Abrasion of moving part of
pump itself.
Replacement of pump
Over-pressure Set the pressure again.
Coolant is not sucked. See Item A).
E) Remarkable rise of coolant
temperature
Abnormal increase of internal
leakage due to trouble of pump
Replace the pump.
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