PG7000™ OPERATION AND MAINTENANCE MANUAL
© 1998-2008 DH Instruments, a Fluke Company
Page 188
All Gas Operated, Liquid Lubricated
Piston-Cylinder Modules
Figure 18.
Gas Operated, Liquid Lubricated
Piston-Cylinder Module (Expanded View)
Before disassembling a gas operated, liquid
lubricated piston-cylinder module, empty the
lubricating liquid reservoir (see Section 5.3.3). After
reassembling, fill the reservoir before using the
piston-cylinder module again.
Gas operated, liquid lubricated piston-cylinders
can usually be cleaned by simply removing the piston,
cleaning it and running it in and out of the cylinder
several times. Do not completely disassemble the piston-
cylinder module beyond removing the piston (step )
unless it is absolutely necessary.
Screw the piston-cylinder module into the base of
its bullet case (Acetal shipping and storage case)
and place the base and module on a clean stable
surface with the piston cap (2) up.
Using a 3 mm Allen tool, loosen the two socket
head sleeve retaining screws (5) from the opposing
sides of the main module housing (4).
In reassembly, after the two sleeve retaining screws
(5) are installed, the sleeve (9) must still have a small
amount of freedom to move and rotate within the main
module housing (4).
While firmly holding down the cap (2), use a 5 mm Allen
tool, to loosen the socket head cap retaining screw
(1). Turning the screw (1) pushes the piston head
(6) straight out of the piston cap (2) ensuring that no
sideways torque is applied to the piston (7). The
cap retaining screw will not fully disengage from the
piston cap due to the adjustment mass (3). Gently
remove the cap and screw from the assembly.
Take care to be sure the piston head is out of the
cap so as NOT to apply torque to the piston (7) when
removing the cap.
In reassembly, when installing the piston cap, be sure
the adjustment mass (3) is still in place on the screw. Take
great care to slip piston cap (2) straight onto the piston
head (6) and not to apply torque to the piston (7).
Unscrew the main module housing (4) from the
bullet case leaving the piston-cylinder and sleeve
assembly behind in the bullet case base. Holding
piston head (6) and taking care not to apply
sideways torque on the piston (7), slide the piston
straight
out of the cylinder (13).
Stop here if you are doing a simple cleaning of the
piston-cylinder (see Section 5.3.4). Do not proceed with this
step of disassembly if you do NOT have a new set of O-rings
(11, 12, 14) to use in reassembly. It is imperative that new O-
rings be used in reassembly.
Using a 3 mm Allen tool, unscrew and remove the four
reservoir cover retaining screws (8). Lift off the reservoir
cover (9a). The small O-ring (12) stays with the reservoir
cover. Remove the large O-ring (11) and its anti-extrusion ring
(10) taking care not to deform the extrusion ring (PC-7200-
100 and PC-7200-200 do not have an anti-extrusion ring).
Remove the reservoir assembly with the cylinder in
it from the bullet case base. Turn over the
assembly and place it on the sturdy surface with the
bottom O-ring (15) up.
Push the cylinder (13) out of the reservoir through
the hole in the bottom of the reservoir and remove
it. Remove the small O-ring (14) from the bottom of
the reservoir.
Continued on next page --->
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