17
Major Maintenance
Assembly
Electrical Maintenance
Minor Maintenance
• To replace the fuse unscrew the Fuse Holder Cap 30 by hand and remove the fuse.
• To replace the 'Plug-in' Components, ie. Timer 26 and Relay 24, loosen the four corner screws found on top of the Enclosure
Assembly 32 with a flat screwdriver and remove the Enclosure Lid 31. The Timer 26 and Relay 24 can now be removed by
simply 'unplugging'. For identification of these items, see the wiring diagrams on pages 18 - 20 and the general assemblies and
parts lists on pages 10 - 16.
• To reset the Thermal Overload 20 on the Contactor 21, remove the cover as above and depress the blue button located on the
contactor assembly.
• Remove the Enclosure Lid 31 as above.
• Pull the two wires leading to the solenoid off the Bridge Rectifier 27 and feed them through the Gland 18 in the Enclosure
Assembly 32.
• Loosen the motor connections at the Contactor 21 and the motor earth wire from the Isolator 22 and free the wires.
• Separate the Enclosure Assembly 32 from the Mounting Plate 17 by loosening and removing the four screws found in the four
corners at the bottom of the Enclosure using a flat screwdriver and a 7 mm spanner
• All the major components ie. Contactor 21, Transformer 13 and the Bridge Rectifier 27 can now be removed and replaced using
a flat screwdriver and a 7 mm spanner.
• If it becomes necessary to effect major maintenance on the Motor 16, the Mounting Plate 17 can be removed by loosening and
removing the four screws securing it to the Motor 16. Ensure that its relative position to the motor is noted.
• If the Mounting Plate 17 has been removed from the Motor 16, replace and secure with the four screws using a flat screwdriver
and a 7 mm spanner.
• Feed the motor wires through the base of the Enclosure Assembly 32 and re-mount it on the Mounting Plate 17 and secure with
the four screws using a flat screwdriver and a 7 mm spanner.
• Re-connect the motor wires as given in the Wiring Diagrams on pages 18 - 20 using a 4 mm flat screwdriver.
Note: 3 phase motors are not direction sensitive.
• Replace and tighten all panel wires using a flat screwdriver.
• Feed the solenoid wire through the Gland 29 and connect to the Bridge Rectifier 27. Tighten the Gland 29 using a 20 mm
spanner.
• Replace the Enclosure Lid 31 and secure using a flat screwdriver.
Note: Replacement of the valve solenoid has been detailed in the Mechanical Maintenance Section on page 7.
• Connect to the power supply, switch 'On' and test for the function of the Directional Valve Solenoid and the Sleep Mode
With these basic Functions in Operation, the HydraPac is ready for use.
Item numbers in bold refer to the General Assembly and Valve Set drawings and Parts Lists on pages 10 - 16.
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