GE 5514, User Manual

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SECTION 4.0
MAINTENANCE & SERVICING
The Figures on the following pages detail the components of each assembly, together
with the relevant part numbers. Where “ASSY” appears as a part number, this indicates
that this particular component is associated with other components in an assembly for
replacement purposes.
Before beginning any maintenance, remove any instruments that may be mounted to the
test pump, and drain the fluid from the system.
4.1 SCREW PRESS SEALS
4.1.1 Turn the screw press out so that there is a distance of at least 1” / 2.5cm
between the large union nut at the end of the barrel and the capstan hub.
4.1.2 Unscrew the union nut, and withdraw the lead screw assembly (24) from the
barrel, taking care not to drop the rambler (22).
4.1.3 Inspect the seals for signs of wear or damage, replace as necessary.
4.1.4 The
white, anti-extrusion ring (21) is a PTFE spiral, and can be removed by
“unwinding” it from the rambler.
4.1.5 When removing the rambler seal (20), 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.
4.1.6 The replacement rambler seal can be eased over the front of the rambler, and
into the groove.
4.1.7 Similarly, the new anti-extrusion ring can be “wound” into the groove in the
rambler, behind the rambler seal.
4.1.8 If the rambler has been separated from the lead screw, ensure that the ball
(23) is correctly fitted before reassembly.
4.1.9 Ensure that the rambler assembly is correctly located on the end of the lead
screw assembly. Carefully introduce the rambler into the open end of the
barrel; making sure that it does not tilt when entering the barrel.
4.1.10 Push the lead screw assembly fully in to the barrel, ensuring that the key in the
nut locates correctly in the slot in the barrel.
4.1.11 Re-tighten the barrel union nut.
Note: If the lead screw assembly (24) shows signs of excessive wear, then it is very
likely that the associated components have worn also, therefore the screw
press assembly is available as a spare part.
4-1 MAINTENANCE & SERVICING