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<8. Maintenance>
8-10
IM 12F4A1-01E
14th Edition : Jul. 15, 2020
(2) Remove the two pulleys of the drive shaft (cell motor shaft) and driven shaft (indicator
electrode-mounting shaft).
The driven shaft pulley can be removed by inserting a 2 mm nominal size Allen wrench
(accessory) into the hole in the shaft, which is used as a lock, and unscrewing the end of the
driven shaft. The drive shaft pulley can be removed by unscrewing two set screws using a
1.5 mm nominal size Allen wrench (accessory).
Remove the pulleys together with the drive belt.
(3) Unscrew the screws fixed on the terminal block of Rotating contact. Unplug the cable
terminals of Rotating contact. Remove Rotating contact from Driven shaft. Hold a new
rotating contact, with its metal surface up, while the cable being on your right side. Then put
the driven shaft throught the center hole.
(4) Install the pulleys and drive belt in place.
(Note) Mount drive shaft pulley so that the tip of the shaft can project out 0.3 to 0.7 mm from the end of the pulley.
(5) Install wiring terminals of Rotating contact on the block terminal of Rotating contact. Be sure
that the wiring never contacts the drive belt.
(6) Feed power to FC400G. Confirm that the driven shaft/drive shaft/drive belt/rotates smoothly,
and that there are no abnormal sounds, like vibration or discontinuous noises.
This completes the replacement procedure.
CAUTION
When you shut the cover of electrode mechanism, be careful not to get cables caught that run
inside the analyzer.
8.10.2
Inspection, Maintenance and Replacement of Drive
Belt
l
Inspection and Maintenance Procedure
The following inspections should be performed in time with other maintenance work which
is performed with the cover of the electrode mechanism block open, e.g., polish of indicator
electrode, to check the condition. The recommended interval is three month.
• Check for the presence of drive belt shavings on the motor mounting plate and the vicinity.
If the materials have been deteriorated or if misalignment between the pulley and the drive
belt has occurred, more drive belt shavings will be produced.
• Rotate the driven pulley clockwise and counterclockwise by hand. Check that rotation is
transmitted to the drive shaft by small play. If the drive belt has lost tension, large play is
needed for the rotation of the drive shaft.
The following inspections and maintenance should be performed approximately every six
months.
• Check the drive belt for cracks due to material deterioration. If significant cracks are found,
replacement is recommended.
• Check the drive belt tooth profile for abnormal trace (significant wear, peeling, etc.). If
abnormal trace is found, replacement is recommended.
• Check the pulleys of the drive shaft and driven shaft for drive belt shavings deposits. If there
are deposits that may interfere with the pulley operation, remove and clean them. Also, clear
away drive belt shavings fallen on the motor mounting plate and the vicinity.
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