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7. Maintenance, cleaning and recalibration
7.2.2 Removing the cover
1. Drain as much oil as possible from the dead-weight tester by turning the spindle pump
fully clockwise and using a drain screwed into the test connection.
2. Unscrew the loose union connection and piston-cylinder system.
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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 retainer screws from the cover and lift it off.
7.2.3 Reservoir seals
1. Unscrew two screws and remove the reservoir cover.
2. Remove the O-ring seal
3. On replacement ensure all sealing faces are absolutely clean and do not overtighten
screws.
7.2.4 Valve seals
1. Unscrew the gland nut.
2. Unscrew the valve spindle and remove the bonded seal.
3. Slide gland nut off spindle.
4. Using a suitable hooked tool remove the O-ring seal
Replace O-ring and seal
5. On replacement ensure that the O-ring is correctly located in the groove and all
sealing faces are clean. Remove all burrs from spindle.
7.2.5 Spindle pump
1. Using a 4 mm hexagon wrench key unscrew the six socket head cap screws securing
the star handle locating plate. (These are positioned inside the groove in the back of
the aluminium star handle).
2. By carefully pulling the star handle the complete piston assembly can now be
withdrawn from the cylinder pipe (during this operation a container is required
beneath the cylinder pipe to catch any liquid).
3. Unscrew the piston from the star handle assembly.
4. The high-pressure seal
fitting the new seals check the piston is not scored on the locating diameters.
5. At this point the star handle assembly should be checked for excess play indicating
wear in the bearing and for wear in the screwed spindle and nut. If any wear is found,
it will be necessary to dismantle the star handle assembly.
6. Check the bore of the block assembly
replacement is required, this item is supplied completely with valves. The block is
screwed to the base by socket head cap screws.
7. Assembly is a straightforward reversal of the described procedures.
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from the groove and the Seloc seal
6
.
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and low-pressure seal
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for any damage or corrosion. If a
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WIKA operating instructions, model CPB3800HP
from the screws.
7
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from the bore of the gland nut.
can now be replaced. Before
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