7. Maintenance, cleaning and servicing
26
WIKA Operating Instruction, model CPP4000-X
EN
14
15
54
60
.0
0
08/2
01
6
GB
7.2.2
Removing the cover
1.
Drain as much oil as possible from the test pump by turning the spindle pump fully clockwise and
using a drain screwed into the test connection.
2.
Remove the oil cups by levering upwards carefully.
3.
Slacken the socket set screw using a 3 mm hexagon wrench key and remove both handwheels.
4.
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.
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 (9) from the bore of the gland nut. Renew
O-ring and bonded seal (10).
5.
On replacement ensure that 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 secur- ing the hub
locating plate. (These are positioned inside the recess in the back of the aluminium hub).
2.
By carefully pulling the hub the complete ram assembly can now be withdrawn from the barrel
(During this operation a container is required beneath the barrel to catch any liquid).
3.
Unscrew the ram from the hub assembly.
4.
The high pressure seal (12A&B) and low pressure seal (15) can now be replaced. Before fitting
the new seals check the ram is not scored on the locating diameters.
5.
At this point the hub 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 hub assembly.
6.
Check the bore of the block assembly (11) is not badly scored or pitted. If a replacement is
required this item is supplied complete with valves. The block is attached to the base by socket
head cap screws.
7.
Re-assembly is a straightforward reversal of the above procedures.
On assembly care should be taken to align the ram to prevent bending, or damage
to the seals. Excessive force should not be used.
The socket head cap screws are not spaced equally around the locating flanges
so check hole alignment before inserting screws.
