YZ Systems Milton Roy • 201 Ivyland Road • Ivyland, PA • USA • 18974 • P: 281.362.6500 • www.yzsystems.com
Page 100
NJEX ZEO Version 04/13/2021
NOTE:
A set of custom tools to replace the
diaphragms without removing the pump from the
cabinet and a diaphragm replacement kit will be
required. The custom tools were supplied with
the cabinet upon purchase. Please contact your
local sales representative if replacements are
required.
1. Follow the Purge and Vent instructions in
the Maintenance instructions in Section 5
of this manual to purge odorant and vent
the suction pressure within the system.
CAUTION:
The NJEX ZEO unit must be purged
and vented prior to disassembling for diaphragm
replacement.
2. Open the oil drain valve located in the back
of the cabinet and drain the oil. Oil should
be collected in a suitable container.
Draining the oil will take approximately 20
to 30 minutes. Please dispose of used oil
in accordance with local laws and
regulations for where the system is
installed.
3. Remove the intermediate block to perform
maintenance on the injection pump by
removing the three screws on the front face
and two on the right face.
4. Note the location of the face seal o-rings on
both the manifold and pump head. Collect
o-rings and discard.
5. Collect any hardware for reuse when
reassembling.
6.
Remove the 1/8” tube fitting from the pump
head for the pressure switch line on the
lower right side of the pump head.
7. Remove the exposed pump head by
removing the eight socket head cap
screws. Remove the pump head and
contour plate.
8. Remove the diaphragms and shims.
Discard diaphragms.
Appendix H: Injection Pump Diaphragm Replacement
Tools Required
(1) Diaphragm Replacement Kit (D3-9009)
(2) Stud Assembly Tool (Custom) (Included
in D3-0295)
(1) Diaphragm Retaining Tool (Custom)
(Included in D3-0295)
•
Allen Wrenches (Imperial)
•
Phillips Head Screwdriver
•
Threadlocker (Loctite 242 or equivalent)
Intermediate
Block
Figure 56 Intermediate Block in Cabinet
Pump
Head
Figure 57 Pump Head in Cabinet
