Milton Roy mRoy XT User manual

339-0072-000
ISSUED 28 APRIL 2011
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INSTALLATION,
OPERATION, AND
MAINTENANCE
MANUAL
mRoy®XT and XW
METERING
PUMP
e
referenc
e
_
________________
_
N
,
ND
E

The following precautions should be taken when working with all metering pumps.
Please read this section carefully prior to installation.
Protective Clothing
ALWAYS wear protective clothing, face shield, safety glasses and gloves when working on or near your
metering pump. Additional precautions should be taken depending on the solution being pumped. Refer
to Material Safety Data Sheets for the solution being pumped.
Hearing Protection
!
It is recommended that hearing protection be used if the pump is in an environment where the time-
weighted average sound level (TWA) of 85 decibels is exceeded. (as measured on the A scale -- slow
response)
Electrical Safety
!
•Remove power and ensure that it remains off while maintaining pump.
•DO NOT FORGET TO CONNECT THE PUMP TO EARTH
•Electric protection of the motor (Thermal protection or by means of fuses) is to correspond to
the rated current indicated on the motor data plate.
Liquid Compatibility
!
Verify if the materials of construction of the wetted components of your pump are recommended for the
solution (chemical) to be pumped.
Pumps Water “Primed”
!
All pumps are tested with water at the factory. If your process solution is not compatible with water, flush
the Pump Head Assembly with an appropriate solution before introducing the process solution
Plumbing and Electrical Connections
! Always adhere to your local plumbing and electrical codes.
Line Depressurization
!
To reduce the risk of chemical contact during disassembly or maintenance, the suction and discharge
lines should be depressurized before servicing.
Over Pressure Protection
! To ensure safe operation of the system it is recommended that some type of safety/pressure-relief valve
be installed to protect the piping and other system components from damage due to over-pressure.
Lifting
! This manual should be used as a guide only - Follow your company’s recommended lifting procedures. It
is not intended to replace or take precedence over recommendations, policies and procedures judged as
safe due to the local environment than what is contained herein.
! Use lifting equipment that is rated for the weight of the equipment to be lifted.
ii
General Precautions For All Pumps

ii
TABLE OF CONTENTS
SECTION 1 - DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.3 PRINCIPLE OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.4 MODEL CODING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.5 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.6 ROUTINE MAINTENANCE KIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SECTION 2 - INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 UNPACKING/INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 STORAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2.3 SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 MOUNTING/LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2.5 MOTOR MOUNTING: DIRECT MOUNTED AND API FLANGE MOUNTED. . . . . . . . . . . . . . . . . . . . . . . 7
2.6 ELECTRICAL CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.7 MOTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.8 PUMP LUBRICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.9 PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.10 BACK PRESSURE SPRING INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.11 OPERATION WITH SUCTION LIFT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
SECTION 3 - OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.1 PUMP START-UP PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.2 RESETTING THE RELIEF VALVE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
3.3 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
SECTION 4 - MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1 SPARE PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.2 RPM KIT COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.3 RETURNING UNITS TO THE FACTORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.4 ROUTINE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.5 SEMI ANNUAL OIL CHANGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.6 CHECK VALVE CARTRIDGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.7 DIAPHRAGM(S). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

iii
4.8 CORRECTIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.8.1 XT & XW Diaphragm Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.8.2 Motor and Worm Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.8.3 Worm Gear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.8.4 Connecting Rod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.8.5 Stroke Adjuster, XT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.8.6 Stroke Adjuster, XW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.8.7 Relief Valve, XT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.8.8 Relief Valve, XW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.8.9 Relief Valve Completion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.8.10 Cleaning and Lubrication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
SECTION 5 - TROUBLESHOOTING GUIDE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
SECTION 6 - PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.1 GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.2 ILLUSTRATED PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.3 XT ASSEMBLY, LIQUID END AND BASE PARTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.4 PARTS LIST FOR XT MOTOR / MOUNT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6.5 PARTS LIST FOR XT PUMP WITH RUPTURE DETECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6.6 PARTS LIST FOR MROY XW DRIVE / LIQUID END. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6.7 PARTS LIST FOR MROY XW RUPTURE DETECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
LIST OF ILLUSTRATIONS
FIGURE 1. Pumping Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
FIGURE 2. Data Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
FIGURE 3. XT Bolt Hole Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
FIGURE 4. XW Bolt Hole Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
FIGURE 5. Back Pressure Spring Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
FIGURE 6. Typical Piping System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
FIGURE 7. XT Assembly Drawing (Sheet 1 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
FIGURE 7. XT Assembly Drawing (Sheet 2 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
FIGURE 8. XT Liquid End and Base Parts Drawing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
FIGURE 9. XT Direct Mount Motor / Mount / Gear Shaft (102-2633-000) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
FIGURE 10. XT API (NEMA 56C) Motor / Mount / Gear Shaft (102-2633-000). . . . . . . . . . . . . . . . . . . . . . . . . . 35
FIGURE 11. XT API (IEC 80) Motor / Mount / Gear Shaft (102-2633-000) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
FIGURE 12. XT With Ruption Detection (Sheet 1 of 2) DWG 102-2633-000. . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

iv
FIGURE 12. XT With Ruption Detection (Sheet 2 of 2) DWG 102-2633-000 . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
FIGURE 13. XW Drive (102-2402-000) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
FIGURE 14. XW Capacity Control, Relief Valve Parts, and Gear Shaft Assembly (102-2402-000) . . . . . . . . . . .44
FIGURE 15. XW Liquid End (102-2402-000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
FIGURE 16. XW Liquid End With Rupture Detection (Sheet 1 of 2) (102-2402-000) . . . . . . . . . . . . . . . . . . . . . .50
FIGURE 16. Additional Rupture Detection Parts (Sheet 2 of 2) (102-2402-000) . . . . . . . . . . . . . . . . . . . . . . . . .51

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1
SECTION 1
DESCRIPTION
1.1 INTRODUCTION
The mRoy pump is a highly reliable controlled vol-
ume pump of hydraulically actuated diaphragm
design. The XT and XW family of mRoy pumps are
described in this manual.
1.2 GENERAL
The mRoy pump capacity is adjustable while the
pump is running or stopped. Capacity adjustment
can be made by manually turning the control knob.
Repetitive accuracy of the metered discharge vol-
ume is maintained within a ±l% range at constant
conditions of pressure, temperature and pump
capacity adjustment setting.
The mRoy pump is a reliable, compact, controlled
volume diaphragm pumps for normal corrosive or
toxic chemicals and light slurries with viscosities up
to 200 S.S.U. (40 cps).
A plunger, reciprocating at a fixed stroke, displaces
a fixed volume of hydraulic fluid which actuates a
flexible, chemically inert PTFE diaphragm to create
pumping action. High quality ball check valves are
used on the suction and discharge to insure con-
sistent metering accuracy. Capacity control is
established by adjusting the volume of hydraulic
fluid which bypasses the diaphragm cavity.
Metering with repetitive accuracy is possible only if
the volume of the hydraulic oil in the displacement
chamber is maintained constant for each stroke.
This is accomplished by mechanically opening the
displacement chamber to the oil reservoir for a
short period at the end of every suction stroke and
the beginning of each pressure stroke. During this
period air or vapor is bled from the system, lost oil
is replenished, and allowances are made for the
expansion or contraction of the oil due to tempera-
ture change. For more information, refer to 1.3
Principle of Operation.
1.3 PRINCIPLE OF OPERATION (FIGURE 1)
Pumping action is developed and controlled by
three basic components as follows (Figure 1):
By-pass ports
in the Plunger
Plunger area shown with
stroke sdjust removed.
Hydraulic By-pass is through
the center of the Plunger
Figure 1. Pumping Action

2
1. The pump plunger reciprocates with a constant
stroke length and displaces oil into and out of the
diaphragm chamber.
2. The flexible diaphragm is a movable partition
between the plunger oil and fluid being pumped.
3. An oil bypass circuit from the plunger by-pass
ports to the reservoir.
In operation, on the discharge stroke, the pump
plunger and the capacity adjustment spool work to
regulate the amount of oil ( Figure 1), which is by-
passed to the oil reservoir. The plunger moves over
the control spool which closes off the by-pass
ports. The place where this occurs is dependent on
the capacity setting. Then the balance of the
plunger displacement is imposed on the flexible
diaphragm that moves and displaces the fluid
being pumped through the discharge ball check.
On the suction stroke, the pump plunger is pulled
away from the diaphragm cavity which decreases
the pressure of the hydraulic fluid. When the pres-
sure is decreased below that of the process fluid,
the process fluid is pushed through the suction ball
check, which then moves the flexible diaphragm.
When the by-pass ports reach the end of the con-
trol rod, the hydraulic cavity is opened to the reser-
voir and the balance of the plunger oil dis-
placement can be supplied from the reservoir
through the by-pass passages.
The discharge capacity is adjusted from 0-100% by
rotating the adjustment knob which moves the con-
trol spool so that the bypass port is closed at the
desired percentage of the total plunger stroke.
When the control spool is adjusted to 100% capac-
ity the bypass port will be positioned so that it is
opened at the very end of the suction stroke. Then
on the pressure stroke, the by-pass ports are
immediately closed so the entire plunger displace-
ment is imposed upon the flexible diaphragm.
With the control spool adjusted for 50% capacity
the by-pass ports will be positioned so that they are
opened when the plunger has completed one-half
of the suction stroke. On the next pressure stroke,
the oil displaced by the pump plunger will be by-
passed through the open ports to the reservoir for
the first 50% of the stroke before the by-pass ports
are closed by the control plunger. The remaining
50% of the plunger displacement will then be
imposed on the flexible diaphragm so that fluid is
discharged for only 50% of the plunger travel. A
similar analysis would apply for 0% capacity setting
on the control valve where all the plunger oil dis-
placement is by-passed to the reservoir.
1.4 MODEL CODING
The model code can be found on the data plate
(Figure 2) attached to the pump. For a general
description of the mRoy pump you have pur-
chased, compare your model number to the prod-
uct codes shown on page 4.
1.5 SPECIFICATIONS
Plunger Diameters:
mRoy XT: 11/32" (9 mm)
mRoy XW: 1/2" (13 mm)
Pressures:
2000-3000 psig (138-207 bar g)
Liquid End Type:
Hydraulically Actuated Disc Diaphragm
Flow Range:
mRoy XT: 2.2 gph (8.3 liter/hr)
mRoy XW: 9.2 gph (34.8 liter/hr)
Materials of Construction:
Head: 316 SS
Seals: Viton or Buna N
Diaphragm: PTFE
(Custom Materials Available)
Flow Rates and Pump Model Coding
See www.miltonroy.com
Data Sheets for Download - mRoy Bulletin
3300
Steady State Accuracy/Turndown Ratio:
+/-1% steady state accuracy over 10:1
turndown ratio (w/constant speed drive).

3
Capacity Adjustment:
Hydraulic bypass from 0 to 100% of rated
capacity while stopped or running.
Liquid Temperature:
Metallic Heads:
20°F (-7°C) to 200°F (93°C)
Internal Relief Valve:
Adjustable (Standard).
Hydraulic Fluid:
Zurnpreen 15A - - Type A, ATF (ISO 32 an
equivalent)
Coating System:
Polyester TGIC Powdercoating
Average Shipping Weight:
XT: 75 lbs (34 kg)
XW: 95 lbs (43 kg)
Stroke Length:
XT: 0.7” (17.8 mm)
XW: 1.5” (38 mm)
1.6 ROUTINE MAINTENANCE KIT
(Includes diaphragm, O-rings, and check
valves for pumps without leak detection)
XT: RPM088 (Single Ball Only)
XW: RPM032
NOTE: XT pumps made prior to 5/2001 -
Notify Milton Roy and order kit by serial num-
ber.
Figure 2. Data Plate
Metric Units Table 1: Capacity / Pressure Table
0 to 34.8 liters/hour - 206.8 BAR maximum
SERIES GEAR RATIO
CODE
STROKES
PER MINUTE METALLIC LIQUID ENDS
L/hr AT 138 BAR L/hr AT 172 BAR L/hr AT 207 BAR
60HZ 50HZ 60HZ 50HZ 60HZ 50HZ 60HZ 50HZ
mRoy
XT
11/32”
(9 mm)
Plunger
77 23 19 1.04 0.87 0.97 0.81 0.90 0.75 Requires
0.37 kW
(1/2 HP)
minimum
48 37 30 1.67 1.39 1.55 1.29 1.44 1.20
24 73 60 3.30 2.75 3.00 2.50 2.80 2.33
15 117 96 5.2 4.3 4.8 4.0 4.5 3.8
10 185 152 8.3 6.9 7.7 6.4 7.2 6.0
mRoy
XW
1/2”
(13 mm)
Plunger
38 48 40 10.6 8.8 10.1 8.4 9.3 7.8 Requires
0.75 kW
(1 HP)
minimum
25 72 60 16.2 13.5 15.1 12.6 14.2 11.9
19 96 80 21.9 18.3 20.4 17.0 18.9 15.8
12 144 120 34.8 29.0 32.5 27.1 30.3 25.2
Requires
1.1 kW
(1 1/2 HP)
minimum

4
SECTION 2
English Units Table 1: Capacity / Pressure Table (continued)
0 to 9.2 GPH - 3000 psi maximum
SERIES GEAR RATIO
CODE
STROKES
PER MINUTE METALLIC LIQUID ENDS
GPH AT 2000 PSI GPH AT 2500 PSI GPH AT 3000 PSI
60HZ 50HZ 60HZ 50HZ 60HZ 50HZ 60HZ 50HZ
mRoy
XT
11/32”
(9 mm)
Plunger
77 23 19 0.27 0.23 0.26 0.21 0.24 0.20
Requires
1/2 HP
minimum
48 37 30 0.44 0.37 0.41 0.34 0.38 0.32
24 73 60 0.87 0.73 0.80 0.67 0.74 0.62
15 117 96 1.37 1.14 1.27 1.06 1.19 0.99
10 185 152 2.2 1.8 2.1 1.7 1.9 1.6
mRoy
XW
1/2”
(13 mm)
Plunger
38 48 40 2.8 2.3 2.6 2.2 2.5 2.1 Requires
1 HP
minimum
25 72 60 4.3 3.6 4.0 3.3 3.8 3.1
19 96 80 5.8 4.8 5.4 4.5 5.0 4.2
12 144 120 9.2 7.7 8.6 7.2 8.0 6.7
Requires
1 1/2 HP
minimum

5
INSTALLATION
2.1 UNPACKING/INSPECTION
Units are shipped Ex Works, Ivyland, Pa. and the
title passes to the customer when the carrier signs
for receipt of the unit. In the event that damages
occur during shipment, it is the responsibility of the
customer to notify the carrier immediately and to
file a damage claim. Carefully examine the ship-
ping crate upon receipt from the carrier to be sure
there is no obvious damage to the contents. Open
the crate carefully so accessory items fastened to
the inside of the crate will not be damaged or lost.
Examine all material inside the crate and check
against the packing list to be sure that all items are
accounted for and intact.
THE FOLLOWING PROCEDURES
SHOULD BE FOLLOWED WHEN A
PUMP IS NOT PUT INTO SURVICE
UPON RECEIPT.
2.2 STORAGE
Short Term Storage (Less than 6 Months)
It is preferable to store the material under a shelter
in its original package to protect it from adverse
weather conditions. In condensing atmospheres,
follow the long term storage procedure.
Long Term Storage (Longer than 6 Months)
The primary consideration in storage of pump
equipment is to prevent corrosion of external and
internal components. This corrosion is caused by
natural circulation of air as temperature of the sur-
roundings change from day to night, day to day,
and from season to season. It is not practical to
prevent this circulation which carries water vapor
and other corrosive gasses, so it is necessary to
protect internal and external surfaces from their
effects to the greatest extent possible.
When the instructions given in this section are
completed, the equipment is to be stored in a shel-
ter; protected from direct exposure to weather. The
prepared equipment should be covered with a
plastic sheet or a tarpaulin, but in a manner which
will allow air circulation and prevent capture of
moisture. Equipment should be stored 12 inches
or more above the ground.
If equipment is to be shipped directly from Milton
Roy into long term storage, contact Milton Roy to
arrange for factory preparation.
Pump Drive and Gearboxes
A. Flood the gearbox compartment with a high
grade lubricating oil/rust preventative such as
Mobil Oil Corporation product Mobilarma 524.
Fill the compartment completely to minimize air
space and water vapor condensation. After
storage, drain this material and refill the equip-
ment with the recommended lubricant for
equipment commissioning.
B. Remove drive motors and mounting adapters,
and brush all unpainted metal surfaces with
multipurpose grease (NLGI grade 2 or 3).
Store these unattached.
Pump Liquid Ends
A. Flood the front compartment of the pump hous-
ing (if the model has a front compartment) with
a high grade Lubricating Oil/Rust Preventative
such as Mobil Oil Corporation product "Mobi-
larma 524."
1. If the pump has a diaphragm style liquid
end, fill the pump-housing compartment all
the way to minimize airspace and water
vapor condensation.
2. Most of the liquid ends themselves are con-
structed of inherently corrosion resistant
materials and require no applied corrosion
inhibitor. If they are NOT naturally resis-
tant (test the threaded or flanged inlet and
outlet connections - if they have little or no
magnetic property, they are resistant) they
should be flush filled with a corrosion inhib-
iting and non-freezing liquid which is com-
patible with the final pumped process
chemical. Flush and fill with inhibitors
such as "Mobilarma 524" or with a com-
mercial automotive antifreeze coolant.
The pump head contains one way check

6
valves, so flush in a direction into the suc-
tion (bottom) connection, and out the dis-
charge (top) connection.
B. Cap or plug all openings to capture the inhibit-
ing fluid, and to prevent animals and insects
from building nests.
Pneumatic, Electrical and Electronic Equip-
ment
A. Motors should be prepared in the manner pro-
scribed by their manufacturer. If information is
not available, dismount and store motors as
indicated in step “B” below.
B. For all pneumatic and electrical equipment,
place packets of Vapor Phase Corrosion Inhibi-
tor (VPCI) inside of the enclosure, then place
the entire enclosure, with additional packets,
inside a plastic bag. Seal the bag tightly
closed. Contact Milton Roy Service Depart-
ment for recommended VPCI materials.
2.3 SAFETY PRECAUTIONS
WARNING
WHEN INSTALLING, OPERATING, AND
MAINTAINING THE XT OR XW PUMP,
KEEP SAFETY CONSIDERATIONS
FOREMOST. USE PROPER TOOLS,
PROTECTIVE CLOTHING, AND EYE
PROTECTION WHEN WORKING ON
THE EQUIPMENT AND INSTALL THE
EQUIPMENT WITH A VIEW TOWARD
ENSURING SAFE OPERATION.
FOLLOW THE INSTRUCTIONS IN THIS
MANUAL AND TAKE ADDITIONAL
SAFETY MEASURES APPROPRIATE
TO THE LIQUID BEING PUMPED. BE
EXTREMELY CAREFUL IN THE
PRESENCE OF HAZARDOUS
SUBSTANCES (E.G., CORROSIVES,
TOXINS, SOLVENTS, ACIDS,
CAUSTICS, FLAMMABLES, ETC.).
THE PERSONNEL RESPONSIBLE FOR
INSTALLATION, OPERATION AND
MAINTENANCE OF THIS EQUIPMENT
MUST BECOME FULLY ACQUAINTED
WITH THE CONTENTS OF THIS MAN-
UAL.
ANY SERVICING OF THIS EQUIPMENT
MUST BE CARRIED OUT WHEN THE
UNIT IS STOPPED AND ALL PRES-
SURE HAS BEEN BLED FROM THE LIQ-
UID END. SHUT-OFF VALVES IN
SUCTION AND DISCHARGE SIDES OF
THE LIQUID END SHOULD BE CLOSED
WHILE THE UNIT IS BEING SER-
VICED. ACTIONS SHOULD BE TAKEN
TO ELIMINATE THE POSSIBILITY OF
ACCIDENTAL START-UP WHILE SER-
VICING IS TAKING PLACE. A NOTICE
SHOULD BE POSTED BY THE POWER
SWITCH TO WARN THAT SERVICING IS
BEING CARRIED OUT ON THE EQUIP-
MENT. SWITCH OFF THE POWER SUP-
PLY AS SOON AS ANY FAULT IS
DETECTED DURING OPERATION
(EXAMPLES: ABNORMALLY HIGH
DRIVE TEMPERATURE, UNUSUAL
NOISE, DIAPHRAGM FAILURE).
2.4 MOUNTING / LOCATION
The XT / XW pump can be mounted on any surface
that is flat and level for the pump base. Three
mounting bolt holes are provided in the XT pump
base (Figure 3) and the XW pump (Figure 4) for
use when the pump is to be firmly anchored to a
foundation surface.
Increased reliability can be expected if pump loca-
tions are avoided which are subjected to high
ambient temperatures (above 100°F (38°C) with
poor free-air circulation over the pump assembly.
Figure 3. XT Bolt Hole Dimensions

7
Outdoor Installations
The XT and XW pump is designed as a totally
enclosed unit suitable for installation either indoors
or outdoors. However, for outdoor installations the
pump mounting area should be selected to provide
protection against environmental extremes:
A. Operation with continuous exposure to tropical
or subtropical sunshine with ambient tempera-
tures above 90°F (32°C), which would cause
higher oil temperatures and affect lubricity
should be avoided. Good installation practice
would dictate providing a sun shade cover over
the pump with open sides to obtain the best air
circulation around the pump.
B. Frequent start-up where the pump has been
idle in an ambient temperature below 30°F (-
1°C) is not recommended. Provide a remov-
able, insulated enclosure over the pump and
mounting base with provisions for an electrical
heater (100 watt light, heat lamp, heater tape
etc.) to maintain the pump oil temperature
above 30°F (-1°C).
2.5 MOTOR MOUNTING: DIRECT MOUNTED
AND API FLANGED MOUNTED
Direct mounted motors have an extended shaft
with worm gear and bearing attached (Figure 9).
If an API flange mounted motor option was
selected for the XT / XW pump, a factory or cus-
tomer supplied motor mounts to the API flange,
using a coupling (Figure 10).
2.6 ELECTRICAL CONNECTIONS
Check to be sure that the electrical supply matches
the pump motor nameplate electrical characteris-
tics. Motor rotation must be counter clockwise
when viewed from the top end of the motor.
ON SINGLE-PHASE PUMP MOTORS
THE ROTATION WILL BE DETERMINED
AT THE FACTORY AND MUST NOT BE
CHANGED. ON THREE-PHASE PUMP
MOTORS THE ROTATION MUST BE
DETERMINED AT THE TIME OF INSTAL-
LATION AND PRIOR TO START-UP.
OPERATION WITH THE WRONG ROTA-
TION WILL DAMAGE THE PUMP AND
MOTOR AND VOID THE WARRANTY.
SHAFT ROTATION CAN BE OBSERVED
BY REMOVING THE COVER PLATE
OVER THE ELECTRICAL CONNEC-
TIONS.
2.7 MOTORS
Adequate power is provided to the simplex XT
pump by the standard 1/2 HP (0.37 KW) motor
(XW pump by the standard 1 HP (0.75 KW) or 1.5
HP (1.1 KW) motor.) The motor is normally a totally
enclosed non-ventilated, type, which is mounted on
a 56C face flange or IEC Frame 71 flange. The
gear reducer (worm shaft) fits onto the standard
motor without using a coupling.
The normal temperature rise for these motors is
50°C above ambient temperature, and it can be
expected that these motors will appear to operate
at higher temperatures than are normally experi-
enced. However, there is no cause for worry if the
following precautions are observed:
A. The motor is placed where there is adequate
ventilation and is protected against excessive
radiation from steam pipes and other heat
sources.
B. The overload heater in the starting device
should be correctly sized for motor full load
current rating as shown on the motor data
plate.
Figure 4. XW Bolt Hole Dimensions

8
2.8 PUMP LUBRICATION
CAREFULLY TWIST AND PULL TO
REMOVE OIL RESERVOIR CAP. DO
NOT APPLY PRESSURE TO JOG CAP
FROM SIDE TO SIDE OR DIP STICK
MAY BREAK.
Oil is supplied for the average installation (ambient
temperature above 50°F (10°C). See recommen-
dation below for lower temperature. Fill pump and
gear box by slowly pouring the proper oil through
the reservoir opening until the oil level in the reser-
voir is level with the oil level mark on outside sur-
face of reservoir. Level can also be checked with
dipstick on oil reservoir cap. Recheck while pump
is operating.
DO NOT OVER FILL AS MOTOR DAM-
AGE CAN RESULT.
Recommended Oil
(Any equivalent oil is acceptable)
XT/XW gear ratios OTHER than
9.5:1 (model code 10) use: Mobil SHC-629
ISO Grade: 150
XT: gear ratio 9.5:1 (model code 10) use:
Oil Type
AGMA Spec No. 2 EP
Zurn Oil Co No. EP 35
ISO Grade 68
Nominal Oil Capacity
2.9 PIPING
General
Refer to Figure 6 for a diagram of a typical recom-
mended piping system.
Support all piping connections to the pump so that
no stress is placed on pump fittings. In no case
should the piping be sprung to make the connec-
tions to the pump. The suction and discharge car-
tridge pipe connections can be positioned within an
arc of approximately 150° to facilitate piping to
pump.
Flush and blow out all pipelines before connecting
the pump. This eliminates any foreign matter that
might seriously damage the internal working parts
of the liquid end. Install a 20 mesh Y-type strainer
that is sized to remove foreign particles with mini-
mum pressure drop in the suction line of the pump.
Install shut-off valves, with unions on the pump
side of the valves, in the suction and discharge
lines to facilitate servicing.
Suction Piping
The suction piping must be absolutely tight and
leak-free. For the XT/XW pump operating on
water-like solutions we recommend that the suction
pipe be 3/4” minimum diameter (much larger than
the connection size) and a maximum of 6 feet (2
meters) long. The intent is that the piping must be
designed to provide an adequate net positive suc-
tion head (NPSH). Obtain our NPSH Calculation
software at the Milton Roy Web site (milton-
roy.com). If assistance in determining NPSH is
needed, contact the Milton Roy Aftermarket Ser-
vice Department.
A flooded suction is recommended for optimum
service life and maintenance-free operation. How-
ever, the XT/XW pump can operate with less than
flooded suction if necessary, in accordance with
the following schedule shown in the chart below.
Pump Model Simplex
XT 1-1/4 Qts. (1.2 liters)
XW 3-1/4 Qts. (3 liters) Model
Number Min. NPSH (PSIA) Max. Lift (Ft. (meter) H2O)
XT 9 10 (3)
XW 9 10 (3)

9
Refer to paragraph 2-11 “Operation with Suction
Lift”, which outlines limiting conditions if suction lift
requirements are anticipated.
For more NPSH information, refer to Milton Roy
web site (www.miltonroy.com) for aid in evaluating
applications for this liquid end.
The supply tank should incorporate a low-level
switch to cut off the pump motor circuit before the
suction intake is exposed to air. Otherwise, the
pump may occasionally run dry.
NOTE: Maximum safety and reliability may be
ensured by protecting liquid ends and piping
with an external relief valve installed in the sys-
tem discharge line.
Discharge Piping
The installation of an external Safety Valve is rec-
ommended, since the pump’s internal relief valve is
not in-tended to protect the piping system. Refer to
“Relief Valve Setting” in Section 3, for further relief
valve discussion. (Milton Roy offers a complete line
of back pressure and safety valves).
For satisfactory metering and capacity control, the
discharge pressure at the pump must be 50 PSIG
(3.5 Bar) Minimum. Therefore, when the pump is to
discharge into an open system, a back pressure
device must be installed in the pump discharge
cartridge or line. Installation of this spring will
assure repetitive metering accuracy.
A spring (XW, 1390) is attached to each XW pump
in a small cloth bag (1380) for installation in the dis-
charge cartridge to develop the required back pres-
sure on the pump if a separate back pressure valve
is not used. XT pump discharge check valves are
maufactured with a spring. The XW back pressure
spring should slip easily through the hole in the
seat. Do not disassemble the seat and/or ball to
insert spring. These check valves are precision
Figure 6. Typical Piping Syatem
Figure 5. Back Pressure Spring Installation

10
manufactured at Milton Roy and should not be dis-
assembled in the field.
2.10 BACK PRESSURE SPRING INSTALLA-
TION IN XW DISCHARGE CHECK VALVE
AFTER XW PUMP HAS BEEN FULLY
PRIMED, REMOVE THE DISCHARGE
CAP FROM THE BODY AND INSERT
SPRING THROUGH THE TOP SEAT TO
REST ON TOP OF THE BALL CHECK.
REPLACE CAP AND TIGHTEN UNTIL
FIRMLY SEATED ON BODY. DO NOT
OVER-TIGHTEN, AS O-RING PROVIDES
THE SEAL.
REMOTE HEAD SYSTEMS: DO NOT
INSTALL A BACK PRESSURE SPRING
IN THE DISCHARGE BALL CHECK
CARTRIDGE OF DIAPHRAGM HEADS
WHICH ARE “REMOTE MOUNTED”
(NOT ATTACHED TO THE MAIN HOUS-
ING). A SEPARATE BACK PRESSURE
VALVE MUST BE INSTALLED IN THE
DISCHARGE LINE FROM THE REMOTE
HEAD CARTRIDGE.
TAKE CARE WHEN INSERTING THE
DISCHARGE PIPE NIPPLE INTO THE
BALL CHECK CARTRIDGE. NIPPLE
SHOULD NOT EXTEND INTO CAVITY,
CAUSING CLAMPING OF THE SPRING
AND RETARDING NORMAL OPERA-
TION.
2.11 OPERATION WITH SUCTION LIFT
It is desirable that the mRoy pump operate with a
flooded suction; however, operation with net posi-
tive suction head (NPSH) less than atmospheric
pressure is possible.
NPSH is the head available, above the vapor pres-
sure of the liquid being pumped, to feed the liquid
into the pump suction port. NPSH minimum is the
head below which the pump cavitates.
Both values are calculated at the suction port of the
pump. In controlled volume pump applications, two
conditions must be considered in the selection of a
pump to meet the NPSH minimum requirements:
1. At the start of the suction stroke, the liquid in
the suction line has no velocity and NPSH
minimum depends on the force necessary to
accelerate the liquid in the suction pipeline.
2. At the peak of the suction stroke there is no
acceleration factor and NPSH minimum
depends on friction losses as calculated
from standard flow equations. With all
viscous fluids and in pilot plants and other
places where unusual numbers of fittings
and valves are used, the second condition
that includes friction losses should be
considered. For water-like fluids, the first
condition will define the limiting
configuration.
For Static NPSH (Condition 1)
Available NPSH = Pa + Ph – Pv (must be equal to
or greater than minimum NPSH as listed under
Installation Instructions.
Required NPSH min = Sp. Gr. (0.0925) LpD
For Dynamic NPSH (Condition 2)
Available NPSH = Pa ± Ph – Pf Le (must be equal
to or greater than minimum NPSH as listed under
Installation Instructions.
D = Plunger Diameter (inches)
Dp = Pipe Diameter (inches)
Lp = Actual Length of suction pipe (feet)
Le = Equivalent length of suction pipe
including allowance for fittings (feet)
Pa = Ambient pressure above liquid (PSIA)

11
Ph = Head of liquid column above (+) or
below (–) center line of plunger (PSIA)
equals Head in feet x (0.435) (Sp.Gr.)
Pv = Vapor pressure of liquid (PSIA)
Pf = Friction loss per foot of pipe calculated
from Reynold Number evaluation
(PSIA) (Use 3.2 times average velocity
for calculating friction losses when
referring to a standard pipe losses
table.)
Minimum NPSH = Minimum hydraulic pres-
sure at plunger (listed
under Installation Instruc-
tions).
When operating the pump with a NPSH of less
than atmospheric pressure (negative suction head
or suction lift), special attention should be given to
keep the suction line strainer clean and prevent
other system conditions that might inadvertently
decrease the NPSH available.
NOTE: Obtain our NPSH calculation software
at the Milton Roy web site (miltonroy.com). If
assistance in determining NPSH is needed,
contact the Milton Roy Aftermarket Service
Department.

12
THIS PAGE INTENTIONALLY BLANK

13
SECTION 3
OPERATION
3.1 PUMP START-UP PROCEDURE
Before initial start up of the pump, check the follow-
ing:
WARNING
FAILURE TO CHECK ALL METALLIC
HEAD BOLTS PRIOR TO STARTUP AND
AFTER ONE WEEK OF OPERATION
MAY EXPOSE OPERATING PERSON-
NEL TO HAZARDOUS LIQUIDS
DO NOT RUN THE MOTOR UNTIL ALL
START UP STEPS HAVE BEEN COM-
PLETED. YOU COULD DAMAGE THE
PUMP IF YOU RUN THE MOTOR
BEFORE ALL OF THE STEPS HAVE
BEEN COMPLETED. IT MAY BE NECES-
SARY TO TEST THE MOTOR OFF THE
PUMP TO INSURE PROPER DIRECTION
AND OPERATION. THE MOTOR DIREC-
TION IS CRITICAL. WIRE THE MOTOR
SO THAT IT ROTATES IN THE DIREC-
TION OF THE ARROW CAST ON THE
MOTOR MOUNT FLANGE. CONSULT
MANUFACTURER DOCUMENTATION
FOR MOTOR START UP RECOMMEN-
DATIONS
1. Check the torque on all metallic head bolts
prior to startup. Recheck torque on all
metallic head bolts after pump has been
operating for one week. Torque the head
assembly screws in a crosswise pattern as
follows:
a) mRoy Model XT Heads: 60–70 in. lbs. (7-
8 N-m) bolting torque.
b) mRoy Model XW Heads:75–85 in. lbs.
(8.5-9.6 N-m) bolting torque, tie down
nuts— 25 in. lbs. (3 N-m).
2. Oil level in air bleed filler reservoir up to or
slightly above the indicated oil level.
3. Set the capacity control knob to
approximately 30-40% of maximum capacity.
4. Make certain that the suction line, liquid end
and discharge cartridge are filled with water
or system fluid.
5. Relieve all back pressure in the discharge
line and pump hydraulic system to allow air
to purge. Reduce pressure on the oil relief
valve until air is purged. Refer to “Start-Up
after the Suction System has Run Dry”
section.
6. If practical, install a temporary discharge line
piped back to the suction tank incorporating
a 100 PSI (7 Bar) relief valve to facilitate
establishing performance during first hours
of operation.
On initial start-up, run the pump for 10–20 sec-
onds, then stop for 20–30 seconds. Repeat a few
times in order to fill the diaphragm oil cavity. Check
for proper motor rotation as described in general
installation instructions. During these short runs lis-
ten for any abnormal motor or crank noises, and if
present, refer to Section 5, Troubleshooting.
Run pump for 1/2 to 1-1/2 hours to warm up oil.
Check discharge line for indication of flow.
Increase capacity adjustment setting to 100% of
capacity and operate for 10–20 minutes
DO NOT SET THE CAPACITY ADJUST-
MENT KNOB IN EXCESS OF 100%
BECAUSE ERRATIC OR REDUCED
METERING WILL DEVELOP.
Reduce capacity adjustment setting to 30–40% of
maximum capacity and operate for several min-
utes, then increase capacity adjustment back to
100% for approximately 10 minutes. Repeat sev-
eral times to insure that the air is bled from the
pump displacement chamber and the liquid end.
(As a general rule, to bleed air or vapor from the
pump oil displacement chamber reduce the capac-

14
ity adjustment to the 20 to 40% range, and to bleed
air or vapor from the liquid end increase capacity to
100%, or if possible reduce the discharge pressure
to atmospheric pressure for 30 seconds to one
minute.)
The pump is now ready for “on-line” service. Calcu-
late what the desired capacity as a percentage of
either the maximum capacity rating on the pump
data plate, or the nominal capacity at the required
system pressure. Each pump is tested at the fac-
tory to confirm that the performance meets these
capacity-pressure requirements (when tested with
water). (Milton Roy offers a complete line of cali-
bration columns for calibrating the pump.)
Start-Up with Back Pressure Spring in Dis-
charge Cartridge
The start-up procedure with the back pressure
spring installed is identical to the above procedure;
however, the back pressure device will hold air in
the liquid end. It is necessary to make certain that
the liquid end is filled with fluid, either by removing
the discharge cartridge and filling liquid end and
inlet lines before start up, or by backing out the dis-
charge cartridge cap approximately seven (7) turns
to remove the spring load on the ball check permit-
ting the air in the liquid end to be discharged.
Start-Up after the Suction System has Run Dry
In applications where the suction tank does not
have a low level cutoff interconnected into the
pump motor circuit, the pump may occasionally run
dry. This should be avoided to insure full integrity of
the diaphragm. Running the pump dry occasionally
will not harm the diaphragm or the pump. When the
pump is repeatedly allowed to run dry, especially
for long periods of time, the diaphragm is fatigued
and could fail before the next scheduled replace-
ment.
Before restarting a pump that has run dry, provi-
sions should be made for filling the liquid end with
liquid by opening the discharge line to atmospheric
pressure to either refill liquid end with flooded suc-
tion pressure or start pump with open discharge
and run for a short period of time (up to 2 minutes)
that will ‘prime’ the liquid end if the ball checks are
wet. If these steps fail, remove the discharge car-
tridge and fill liquid end with liquid through the top
discharge opening in the head. After establishing
flow, return to the regular discharge system config-
uration.
3.2 RESETTING THE RELIEF VALVE
DESCRIPTION
The mRoy XT/XW pump incorporates an internal
relief valve that is preset at the factory to relieve
when the hydraulic fluid pressure exceeds 3200
PSIG (220.6 Bar). This setting can be readjusted
as required up to 15% above the maximum rated
pressure of the pump. Resetting the internal relief
valve will change the potential discharge pressure
of the pump.
Refer XT, Figure 7 (Sheet 2) XW, Figure 14 for a
pictorial description of the mechanism.
Examination of these drawings will reveal a small
passage connecting the oil side of the diaphragm
head cavity with the oil reservoir. This passage is
stopped off by a ball, XT pump and poppet, XW
pump that is held in place by a spring secured by a
set screw. A plastic screw plug keeps the adjusting
threads free of dirt.
In operation, the spring-loaded ball, XT pump and
poppet, XW pump is held against the seat in the
housing until the pressure in the oil side of the dia-
phragm cavity exceeds the pressure for which the
valve has been set. When this occurs, the ball or
poppet is forced off its seat, permitting the oil to
flow from the diaphragm cavity through the
mechanical passage to an opening (Figure 7 or 14)
in the side of the oil reservoir. The resilient material
of the poppet permits the XW relief valve to actuate
without erosion of the poppet or seat surface.
Relief Valve Setting
Pump must be at operational pressure and
capacity set at 95%.
1. Remove yellow plastic plug located at top of
pump next to oil fill hole.
2. Using a 3/16” hex. key (mRoy XT), or a 5/16”
hex. key (mRoy XW) as required for different
models, turn adjusting screw clockwise to
increase cracking pressure until pump
ceases to bypass through relief valve at
desired working pressure. When relieving
has stopped, adjust screw clockwise up to