KD Scientific 35 Ventilator - Manual (Page 14)

12
KDS35 Small Animal Ventilator
Changing Piston and Cylinder
(continued)
TO REMOVE THE CYLINDER AND PISTON
1) Set the Ventilator volume to maximum.
2) Run Ventilator at lowest speed and stop when the helical coupling is exposed.
3) Using a 0.050 Allen wrench (provided), disconnect the white piston from the cou-
pling, leaving the coupling on the piston shaft.
4) Remove the two screws located in the front of the slide valve.
5) Remove piston and cylinder.
6) Be careful to save the O-ring that is recessed in the slide valve block between the
screws. The O-ring provides the airtight seal between the plastic cylinder and the
valve block.
TO INSTALL THE PISTON AND CYLINDER
1) Pick out the new piston and cylinder.
2) Using pliers, remove the piston and lubricate with the grease provided.
3) Insert the lubricated piston in the cylinder so that the rear of the piston is flush with
the rear of the cylinder with the 1/8" diameter coupling stud protruding.
4) Fasten the cylinder to the valve block with the two screws, making sure the O-ring
is in place. Do not tighten these two screws completely, but just enough to hold
the cylinder in place.
5) The object of alignment is to have the stud at the end of the piston be exactly in
line with its mating hole in the helical coupling. This insures that the piston moves
freely within the cylinder without undue friction.
6) The two screws at the front of the valve block control left to right alignment while
the four screws at the rear of the slide valve control up and down alignment. By
adjustment of these 6 screws the proper alignment can be made. Remember that
the screws interact with one another so the procedure may have to be repeated
one or more times.
7) When proper alignment is achieved, the helical coupling should be connected. If
alignment is correct, the coupling should slide onto the piston stud without bending
of the piston rod.