REGULAR INSPECTION B-9
6.3 When the Lubricant Pressure does not Rise
When the lubricant pressure does not rise, the lubricating oil pump may be malfunctioning, or
lubricant leakage is occurring. Disconnect the piping according to the following procedure to
locate the cause and solve the problem.
<Procedure>
1) Remove the line filter piping from the lubricating oil pump.
2) Place a plug over the line filter discharge outlet.
3) Press the manual lubrication button for more than 10 seconds. Check that the lubricant
pressure rises to between 1.0 MPa - 1.2 MPa during pump operation.
<Cause>
This problem may be caused by the following two factors.
• When the lubricant pressure does not rise: The lubricating unit may be malfunctioning.
• When the lubricant pressure rises: The piping or the distributor may be
malfunctioning.
Refer to the following table to solve the problem.
<Troubleshooting>
*1
Following air bleeding from the piping, ensure that the pressure rises to between
1.0 MPa - 1.2 MPa.
*2
Contact Mori Seiki Service Department for assistance.
Condition Cause Action
When the lubricant
pressure does not rise
(lubricating unit
malfunction)
Suction filter clogging Cleaning or replacement
Relief valve clogging or damage
Disassembly/cleaning or
replacement
Air bleeding
*1
Pump malfunction
Replacement
*2
When the lubricant
pressure rises (piping or
distributor malfunction)
Piping damage Replacement
Failure in air bleeding from the
piping
Air bleeding from the piping
*1
Distributor malfunction
Replacement
*2
NOTE
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