WIKA CPB3800 - Handbuch (Seite 34)

34 WIKA operating instructions model CPB3800
14062232.03 12/2013 GB/D
GB
7. Maintenance, cleaning and recalibration
7. Maintenance, cleaning and recalibration
7.1 Periodic maintenance
Repairs must only be carried out by the manufacturer.
Cleaning the units and checking the liquid levels is the only periodic maintenance
required. With normal use, no further maintenance should be necessary. If required, the
system can be returned to the manufacturer for re-conditioning. Accuracy, overhaul and
re-certification are also explained in chapter 7.4.1 "Factory overhaul and re-certification
of pressure balances maintenance of accuracy".
Fluids, which attack ABS, should be used with caution. Continual
immersion of the cover in such fluids will cause deterioration. Spillage’s
should be wiped off immediately.
7.2 Corrective maintenance
7.2.1 General
This section contains details on stripping the unit and replacing the spare parts which
are listed (see chapter 10 "Accessories"). The component identification numbers in
brackets in each procedure refer to the following figure.
7.2.2 Removing the cover
1. Drain as much oil as possible from the pressure balance by winding the screwpress
fully clockwise and using a drain screwed in the gauge stand.
2. Unscrew the loose union connection and piston-cylinder unit.
3. Remove the oil cups by levering upwards carefully.
4. Slacken the socket set screw using a 3 mm hexagon wrench key and remove both
handwheels.
5. Remove the four cover retaining screws and lift off the cover.
7.2.3 Reservoir seals
1. Unscrew two screws and remove the reservoir cover
2. Remove the O-ring seal (6) from the recess and the seloc seal (7) from the screws.
3. On replacement ensure all sealing faces are absolutely clean and do not overtighten
screws.