28 Installation, Operations & Maintenance Manual
BEFORE CARRYING OUT ANY
SERVICING OPERATION ON
THE METERING UNIT OR PIPES, DISCONNECT ELECTRICAL
POWER FROM THE PUMP. TAKE THE NECESSARY STEPS TO
ENSURE THAT ANY HARMFUL LIQUID IN THE PUMP OR PIPING
SYSTEM CANNOT ESCAPE OR COME INTO CONTACT WITH
PERSONNEL. SUITABLE PROTECTIVE EQUIPMENT MUST BE
PROVIDED. CHECK THAT THERE IS NO PRESSURE BEFORE
PROCEEDING WITH DISMANTLING.
4.4 ROUTINE MAINTENANCE
The mRoy pump is designed for reliable service
with a minimum amount of maintenance required.
Part of regular maintenance includes:
• Clean the pump regularly to prevent dust or liquid
build-up.
• Check for leaks regularly.
• Check oil levels regularly to prevent pump
damage or overheating.
Yearly replacement of check valves, diaphragm,
and relief valve poppet is recommended. For
convenience, these parts are available in a Routine
Preventative Maintenance (RPM) Kit from your
local representative. RPM kit numbers are listed in
Section 1, Figure 7 (mRoy A) & Figure 12 (mRoy B).
4.5 SEMI ANNUAL OIL CHANGE
The oil in the main housing should be drained twice
a year, using the drain plug provided, and new oil
installed. This can usually be scheduled to coincide
with the change from winter to summer grade
oil and vice versa. Refer to “Pump Lubricants”
in Section 2, Installation, for information on
recommended oil and oil capacity.
NOTE:
When adding oil, pour in a thin, slow stream
to avoid overow, then check level.
4.6 CHECK VALVE CARTRIDGES
Milton Roy Company recommends that the check
valves are replaced on an annual basis. If highly
corrosive material (acids, slurries, etc.) is being
pumped, some applications may require more
frequent replacement.
In general, poor or reduced pump performance
indicates that the check valves need to be replaced
(refer to Section 5, Troubleshooting).
Complete instructions for replacing worn check
valves are given in the “Corrective Maintenance”
section.
The mRoy check valves are complete assemblies
manufactured at the factory and should not be
disassembled in the eld.
To determine if the check valves need replacement,
with the pump off and pressure removed from
system unscrew the check valve from the liquid end
and look through the hole in the check valve seat.
The ball should appear perfectly round and free of
pits, mars, or scratches. If the ball and/or seat is
excessively damaged, the replacement schedule
should be shortened accordingly. If the ball and
seat are both in good condition, the replacement
schedule can be lengthened.
4.7 DIAPHRAGM(S)
The mRoy PTFE diaphragm is extremely durable
and often lasts for many years. As a preventative
measure, Milton Roy recommends that the mRoy
diaphragm be replaced yearly to coincide with
check valve replacement. Also whenever the head
is removed freeing the diaphragm the diaphragm
must be replaced. Refer to the instructions in the
“Corrective Maintenance” section for diaphragm
replacement.
SECTION 4 - MAINTENANCE
To Next Page
Loading...
