22
Instruction Manual
SECTION 4 - MAINTENANCE
4.3 LIQUIFRAM™ (DIAPHRAGM)
REPLACEMENT
ALWAYS WEAR PROTECTIVE
CLOTHING, FACE SHIELD, SAFETY
GLASSES AND GLOVES WHEN WORKING NEAR OR
PERFORMING ANY MAINTENANCE OR REPLACEMENT ON
YOUR PUMP. SEE SDS INFORMATION FROM SOLUTION
SUPPLIER FOR ADDITIONAL PRECAUTIONS.
LMI
®
metering pumps are designed for trouble-free
operation, yet routine maintenance of elastomeric
parts is essential for optimum performance. This
involves replacing the LIQUIFRAM™, cartridge
valves, O-rings and the injection check valve
spring. LMI
®
recommends replacing these parts at
least once a year; however, frequency will depend
on your particular application.
When replacing the LIQUIFRAM™, the cartridge
valves, or O-rings, the injection check valve spring
should also be replaced (see next Section 4.4). A
Spare Parts Kit or RPM PRO PAC™ kit containing
these parts may be obtained from your local
distributor.
Replacing the LIQUIFRAM™:
1. Carefully depressurize, drain, and disconnect
the discharge line (see previous sections in this
manual).
Liquid End
Drive
LIQUIFRAM
™
Adapter Disk
Shaft
Seal
Figure 15. LIQUIFRAM™
(Diaphragm) Replacement
2. Place the Foot Valve into a container of water or
other neutralizing solution. Turn the pump on to
flush the head assembly. Once the pump head
has been flushed, lift the Foot Valve out of the
solution and continue to pump air into the pump
head until the pump head is purged of water or
neutralizing solution.
Note:
If the liquid cannot be pumped due to
LIQUIFRAM™ rupture, carefully disconnect the
suction and discharge tubing using protective
clothing, gloves and face shield, immerse the
head in water or other neutralizing solution.
3. Remove the four metric screws and washers
from the head using an M4 Allen wrench.
4. Start the pump. While running, set the Stroke
Adjustment Knob to 0% and then turn the pump
off.
5. With the unit off, unscrew the LIQUIFRAM™
by carefully grasping the outer edge and
turning it counter-clockwise
Q
. Discard old
LIQUIFRAM™. Remove the Adapter Disk
(located behind the LIQUIFRAM™) and ensure
that the diameter of the raised section is the
same as the diameter of the replacement
LIQUIFRAM™.
6. Check condition of the Shaft Seal. Replace Shaft
Seal if necessary.
7. Replace the Adapter Disk so that the drain
hole of the disk is oriented downward, and the
mounting holes line up with the mounting holes
of the pump.
BE CAREFUL NOT TO SCRATCH
THE FLUOROFILM™ FACE OF THE
NEW LIQUIFRAM™.
8. Screw on the new LIQUIFRAM™ clockwise until
turned all the way in. Start the pump and turn
the stroke knob to 100%. Stop the pump.
9. Remount the pump head using the four (4)
screws and washers. Tighten in a criss-cross
pattern. Torque screws to 25 inch-pounds.
After one week of operation, recheck the screws
and tighten if necessary.
