10
5-6 Carbon brushes
①
Cautions when in use
WARNING
Always check the wearing condition of the carbon brushes. When the carbon brushes have
been worn down and exchanging time has come, the motor will stop automatically.
Replace when a carbon brush has been worn down to 6mm in length as shown below or
working time of the motor is 150 hours or more subject to the conditions of their uses. Use
only NITTOH carbon brushes with these pumps to promote long pump life. When they
have been worn down, the spring exerts insufficient pressure to hold brush against the
commutator.
②
How to change
Firstly disconnect the power supply. Remove rubber caps on two places and loosen and
remove fitting screws inside with a screw driver, so the carbon brushes can be taken out.
Replace with new ones and fix the screws and rubber caps.
5-7 Relief valve adjustment
①
Range of standard pressure adjustment available is form 58.8 to 68.6MPa. Loosen lock
screw on the high-pressure relief valve and turn the adjusting screw a few turns
counter-clockwise to decrease pressure setting to a lower desired pressure. Clockwise
rotation of the adjusting screw will increase pressure. After setting pressure, replace the
lock screw.
Different kind of a spring is needed to adjust and set at lower pressure than the standard.
Consult NITTOH authorized distributor.