31Installation, Operations & Maintenance Manual
with masking tape. Leaving the masking tape
in place during assembly will make the process
easier. These parts already have an O-ring in
place between them.
2. Drop a new O-ring (540) into position in the
discharge port of the liquid end. Slip the entire
discharge cartridge (still held together with
masking tape) into the discharge port (only one
end will t in).
3. Screw a nut (521) two or three turns (just enough
to hold) on one end of each through bolt. Slide
the compression plate over the discharge
cartridge (517). Slip the bolts (521) through the
holes in the compression plate and diaphragm
head so that they fall through and hang out the
bottom.
4. Fit a new O-ring (540) into position on the top
of the suction cartridge.
5. Insert the suction cartridge and O-ring up into
the suction port of the liquid end. Position the
other compression plate (518) under the suction
check valve by sliding it up on the bolts. Screw
on the two remaining nuts (519). The suction
check valve should now be held in place in the
liquid end. Tighten the nuts on the through bolts
rmly. Do not over-tighten or plastic ttings may
be damaged.
4.9.2 Relief Valve Poppet Replacement
(Figure 18)
If the pump is allowed to operate for long periods
with the relief valve relieving pressure, there is a
possibility that the poppet will wear, causing erratic
ow and discharge pressure. If this occurs, the relief
valve poppet should be replaced. Even if excessive
wear has not occurred, it is still recommended that
the poppet be replaced on a yearly basis.
Disassembly
1. Unscrew and remove the relief valve screw plug
(1350).
2. Unscrew and remove the relief valve adjustment
screw (50).
3. Remove the relief valve spring (40). A pair of
tweezers may be required to remove the spring
from the relief valve port.
4. Remove the relief valve poppet (30) with a
tweezer or by “jogging” the motor, causing oil to
ow up through the relief port to oat the poppet
up and out of the threaded hole.
Reassembly
1. Temporarily secure a new poppet (30) into the
end of the spring (40) with thick grease. Drop
this assembly into place in the relief valve
port.
2. Install the relief valve adjustment screw (50) until
the spring (40) is lightly compressed. Follow the
instructions for resetting the relief valve given in
Section 3, Operation.
4.9.3 Diaphragm replacement (Figure 19-26)
The mRoy A & B models have different assembly
depending on whether they have leak detection.
Be sure to refer to the appropriate Figure (19-26)
when replacing the diaphragm(s).
Disassembly
1. Remove the eight (8) bolts (350 or 355) from
the diaphragm head (330), depending on the
model.
2. Remove the diaphragm (290).
3. Remove the contour plate(s) (282).
4. If servicing a pump with a square ring (260),
remove and discard the square ring.
5. If servicing a double diaphragm style pump,
remove the intermediate chamber and square
head plated pipe.
6. Carefully clean any parts to be reused. If any
chemicals are used in the cleaning process,
ensure that they are approved with the process
liquid and hydraulic oil.
SECTION 4 - MAINTENANCE
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