Product Manual

P3100 & P3200 Series
Users Manual
6-10
Top Plate Removal
Note
In order to perform maintenance procedures on the hydraulic system, the
Top Plate Assembly must first be removed from the instrument case.
1. Depressurize the system, open the reservoir valve, and turn the capstan fully in.
2. Disconnect any DUT from the test station, and remove the fluid from the reservoir*.
3. Remove the spokes from the capstan hub of the screw pump.
4. Remove the 4 screws from the instrument top plate (1 at the mid-point of each edge).
5. Hold the top plate assembly by the test station, and tilt the plate so that the rear edge
is lifted, but the front edge remains in contact with the instrument case.
6. Slide the top plate towards the rear until the capstan hub of the screw pump is clear of
the front lip of the instrument case.
7. Lift out the top plate assembly.
*The reservoir is fitted with a drain plug, which can be accessed from the underside of
the instrument case (Refer to Chapter 6, Reservoir Assembly).
W Caution
When handling the top plate assembly, it is good practice to
remove the piston assemblies to avoid accidental damage.
Note
Replacement is simply the reverse of the above procedure.
Screw Pump Assembly
1. Unscrew the large union nut (just behind the inner hub) of the screw press assembly.
2. Withdraw the lead screw assembly from the barrel (6), taking care not to drop the
rambler assembly (3).
3. The white, anti-extrusion ring (4) is a PTFE spiral and can be removed by
“unwinding” it from the rambler.
4. When removing the rambler seal (5), take care not to use any tool that may have a
sharp edge that will scratch the surfaces of the rambler, otherwise it may leak when
reassembled.
5. The replacement rambler seal can be eased over the front of the rambler, and into the
groove.
6. Similarly, the new anti-extrusion ring can be “wound” into the groove in the rambler,
behind the rambler seal.
7. If it is necessary to remove the barrel (6), the locknut (7) must be loosened
approximately ½ turn. The barrel can then be unscrewed from the test station (9).
Note
It is often easier to remove the barrel support bracket (11) to allow greater
movement, (remove the 2 screws (12) from the upper side of the top plate).
8. Before re-fitting the barrel, ensure that the barrel seal (8) is correctly located in the
counter-bore in the front of the barrel. Screw the barrel fully in to the test station, and
secure with the locknut.
9. Re-align the barrel support bracket (if removed), and secure through the top plate
with the 2 screws (12).