BLACKMER SNP1.25 Manual

BLACKMER POWER PUMPS 960255
INSTRUCTIONS NO. 104-A00
INSTALLATION OPERATION AND MAINTENANCE INSTRUCTIONS Section
Effective
Replaces
104
May 2010
Oct 2007
MODELS: SNP1.25, SNP1.5, SNP2, SNP2.5, SNP3A
SNPJ1.25 *, SNPJ1.5 *, SNPJ2 *, SNPJ2.5 *
TABLE OF CONTENTS Page
PUMP DATA
Technical Data ......................................................2
Initial Pump Start Up Information...........................2
INSTALLATION
Pre-Installation Cleaning .......................................3
Location and Piping...............................................3
Pump Mounting.....................................................4
Coupling Alignment...............................................4
Pump Rotation.......................................................4
To Change Pump Rotation....................................4
Check Valves ........................................................4
Jacketed Heads.....................................................4
OPERATION
Pre-Start Up Check List.........................................5
Start Up Procedures..............................................5
Running the Pump in Reverse Rotation ................6
Flushing the Pump ................................................6
Pump Relief Valve.................................................7
Relief Valve Setting and Adjustment.....................7
MAINTENANCE
Strainers...................................................................8
Lubrication................................................................8
Vane Replacement...................................................8
Pump Disassembly ..................................................9
Parts Replacement...................................................9
Pump Assembly.....................................................11
TROUBLE SHOOTING .................................................13
* Effective Jan 2006, jackets are considered an option and
no longer change the model number.
NOTE: Numbers in parentheses following individual parts
indicate reference numbers on Blackmer Parts List No.
104-A01, 104-A02, 104-A03 and 104-A04.
Blackmer pump manuals and parts lists may be obtained
from Blackmer's website (www.blackmer.com) or by
contacting Blackmer Customer Service.
SAFETY DATA
This is a SAFETY ALERT SYMBOL.
When you see this symbol on the product, or in the manual,
look for one of the following signal words and be alert to the
potential for personal injury, death or major property damage
Warns of hazards that WILL cause serious personal injury,
death or major property damage.
Warns of hazards that CAN cause serious personal injury,
death or major property damage.
Warns of hazards that CAN cause personal injury
or property damage.
NOTICE:
Indicates special instructions which are very
important and must be followed.
NOTICE:
Blackmer Pumps MUST only be installed in systems, which
have been designed by qualified engineering personnel.
The system MUST conform to all applicable local and
national regulations and safety standards.
This manual is intended to assist in the installation and
operation of the Blackmer SNP / SNPJ Series pumps, and
MUST be kept with the pump.
Pump service shall be performed by qualified technicians
ONLY. Service shall conform to all applicable local and
national regulations and safety standards.
Thoroughly review this manual, all instructions and hazard
warnings, BEFORE performing any work on the pump.
Maintain ALL system and pump operation and hazard
warning decals.

104-A00 page 2/16
SAFETY DATA
Hazardous
machinery can
cause serious
personal injury.
Failure to disconnect and lockout
electrical power or engine drive before
attempting maintenance can cause
severe personal injury or death
Hazardous voltage.
Can shock, burn or
cause death.
Failure to disconnect and lockout
electrical power before attempting
maintenance can cause shock, burns or
death
Hazardous
machinery can
cause serious
p
ersonal in
j
ur
y
.
Failure to stop the pump before
adjusting the shaft packing can cause
severe personal injury.
Hazardous pressure
can cause personal
injury or property
damage
Disconnecting fluid or pressure
containment components during pump
operation can cause serious personal
injury, death or major property damage
Hazardous or toxic
fluids can cause
serious injury.
If pumping hazardous or toxic fluids,
system must be flushed and
decontaminated, inside and out, prior to
performing service or maintenance
Hazardous pressure
can cause personal
injury or property
damage
Failure to relieve system pressure prior
to performing pump service or
maintenance can cause personal injury
or property damage.
Do not operate
without guard
in place
Operation without guards in place can
cause serious personal injury, major
property damage, or death.
PUMP DATA
PUMP IDENTIFICATION
A pump Identification tag, containing the pump serial number, I.D. number, and model designation, is attached to each pump. It is
recommended that the data from this tag be recorded and filed for future reference. If replacement parts are needed, or if
information pertaining to the pump is required, this data must be furnished to a Blackmer representative.
TECHNICAL DATA *
SNP(J)1.25
SNP(J)1.5
SNP(J)2
SNP(J)2.5
SNP3A
Maximum Pump Speed 1800 RPM 640 RPM
Maximum Operating
Tem
p
erature 240°F (115°C) 240°F (115°C)
Maximum Viscosity 20,000 SSU
(
4
,
250 cSt
)
20,000 SSU
(
4
,
250 cSt
)
Maximum
Differential Pressure 150 psi
(
10.3 Bar
)
150 psi
(
10.3 Bar
)
Maximum
Workin
g
Pressure 175 psi
(
12.1 Bar
)
175 psi
(
12.1 Bar
)
Maximum
Jacket Pressure 150 psi
(
10.3 Bar
)
150 psi
(
10.3 Bar
)
* Technical Data is for standard materials of construction.
Consult Blackmer Material Specs for optional materials of
construction.
INITIAL PUMP START UP INFORMATION
Model No.: ____________________________________
Serial No.: ____________________________________
ID No.: _______________________________________
Date of Installation: _____________________________
Inlet Gauge Reading: ____________________________
Discharge Gauge Reading: _______________________
Flow Rate: _____________________________________

104-A00 page 3/16
INSTALLATION
NOTICE:
Blackmer pumps must only be installed in systems
designed by qualified engineering personnel. System
design must conform with all applicable regulations and
codes and provide warning of all system hazards.
Hazardous voltage.
Can shock, burn or
cause death.
Install, ground and wire to local and
National Electrical Code requirements.
Install an all-leg disconnect switch near
the unit motor.
Disconnect and lockout electrical power
before installation or service
Electrical supply MUST match motor
nameplate specifications.
Motors equipped with thermal protection automatically
disconnect motor electrical circuit when overload exists.
Motor can start unexpectedly and without warning.
Hazardous pressure
can cause personal
injury or property
damage
An external bypass valve and/or internal
relief valve must be installed in the
system to protect the pump from
excessive pressure.
Hazardous pressure
can cause personal
injury or property
damage
Incorrect bypass valve or internal relief
valve settings can cause pump
component failure, personal injury, and
property damage.
NOTICE:
Blackmer SNP Pump sizes 1.25, 1.5, 2 and 2.5 may or may
not be fitted with an bolt-on relief valve. If the bolt-on
relief valve is not supplied, an external bypass valve
MUST be used.
PRE-INSTALLATION CLEANING
NOTICE:
New pumps contain residual test fluid and rust inhibitor.
If necessary, flush pump prior to use.
Foreign matter entering the pump WILL cause extensive
damage. The supply tank and intake piping MUST be cleaned
and flushed prior to pump installation and operation.
LOCATION AND PIPING
Pump life and performance can be significantly reduced when
installed in an improperly designed system. Before starting the
layout and installation of the piping system, review the
following suggestions:
1. Locate the pump as near as possible to the source of
supply to avoid excessive inlet pipe friction.
2. The inlet line must be at least as large as the intake port
on the pump. Slope the piping downward to the pump,
without any upward loops. Eliminate restrictions such as
sharp bends; globe valves, unnecessary elbows, and
undersized strainers.
3. Install a system bypass valve that returns excess flow to
the supply tank or pump inlet piping as appropriate for the
pumping system. Insure that the bypass valve pressure
setting is appropriate for the pump and system component
working pressures.
4. It is recommended a strainer be installed in the inlet line to
protect the pump from foreign matter. Locate the strainer
at least 24" (0.6m) from the pump, and have a net open
area of at least four times the area of the intake piping.
Strainers must be cleaned regularly to avoid pump
starvation.
5. The intake system must be free of air leaks.
6. Expansion joints, placed at least 36" (0.9m) from the
pump, will compensate for expansion and contraction of
the pipes. Contact the flexible connector/hose
manufacturer for required maintenance/care and design
assistance in their use.
7. Install pressure gauges in the NPT ports provided in the
pump casing to check pump at start up.
7. ALL piping and fittings MUST be properly supported to
prevent any piping loads from being placed on the pump.
8. Check alignment of pipes to pump to avoid strains which
might later cause misalignment. See Figure 1. Unbolt
flanges or break union joints. Pipes should not spring
away or drop down. After pump has been in operation for
a week or two, completely recheck alignment.
Figure 1
9. When pumping liquids at elevated temperature, make
provisions to compensate for expansion and contraction of
the pipes, especially when long pipe lines are necessary.
Steel pipe expands approximately 3/4” (1.9 cm) per 100
feet (30.49 m) per 100°F (37.8°C) rise in temperature.

104-A00 page 4/16
INSTALLATION
PUMP MOUNTING
A solid foundation reduces noise and vibration, and will
improve pump performance. On permanent installations it is
recommended the pumping unit be secured by anchor bolts
as shown in Figure 2. This arrangement allows for slight
shifting of position to accommodate alignment with the
mounting holes in the base plate.
Figure 2 - Pipe Type Anchor
Bolt Box
For new foundations, it is
suggested that the anchor bolts
be set in concrete. When
pumps are to be located on
existing concrete floors, drill
holes into the concrete to hold
the anchor bolts.
When installing units built on channel or structural steel type
bases, use care to avoid twisting the base out of shape when
anchor bolts are tightened. Use shims under the edges of the
base prior to tightening the anchor bolts to level the base and
prevent distortion.
COUPLING ALIGNMENT
The pump must be directly coupled to a gear and/or driver
with a flexible coupling. Verify coupling alignment after
installation of new or rebuilt pumps. Both angular and
parallel coupling alignment MUST be maintained between the
pump, gear, motor, etc. in accordance with manufacturer’s
instructions. See Figure 3.
1. Parallel alignment: The use of a laser alignment tool or
dial indicator is preferred. If a laser alignment tool or dial
indicator is not available, use a straightedge. Turn both
shafts by hand, checking the reading through one
complete revolution. Maximum offset must be less than
.005" (.127 mm).
2. Angular alignment: Insert a feeler gauge between the
coupling halves. Check the spacing at 90° increments
around the coupling (four checkpoints). Maximum
variation must not exceed .005" (.127 mm). Some laser
alignment tools will check angular alignment as well.
3. Replace the coupling guards after setting alignment.
Figure 3 – Alignment Check
Do not operate
without guard
in place
Operation without guards in place can
cause serious personal injury, major
property damage, or death.
PUMP ROTATION NOTICE:
Confirm correct pump rotation by checking the pump
rotation arrows respective to piping flow direction. Do
not operate the pump in reverse rotation to reverse the
direction of flow.
1. Determine direction of flow where the pump will be
installed.
2. Confirm pump is installed in piping so that the flow will
pass through the pump from inlet to outlet. The inlet of
the pump has “INLET” cast in the cylinder and the outlet
has “OUTLET” cast in the cylinder.
3. Briefly “jog” pump with pump driver. Check rotation of
pump driver with respect to rotation arrow on pump.
A right-hand pump rotates clockwise with the intake on the
right side, when viewed from the driven end.
A left-hand pump rotates counterclockwise with the intake on
the left side, when viewed from the driven end.
TO CHANGE PUMP ROTATION
To reverse rotation, the pump must be disassembled then
reassembled with the shaft on the opposite side of the pump.
See the ‘Maintenance’ section for instructions.
CHECK VALVES
The use of check valves or foot valves in the supply tank is
not recommended with self-priming, positive displacement
pumps.
If the possibility of liquid backflow exists when the pump is
off, a check valve in the pump discharge piping is
recommended because the pump can motor in the reverse
rotation and create undue stress on all attached components.
Never start a pump when it is rotating in the reverse rotation
as the added starting torque can damage the pump and
related equipment. If a check valve is used, install it at the
pump discharge.
OPTIONAL JACKETED HEADS
Hot oil or steam can be circulated through jacketed heads by
connections at the jacket pipe plugs (73B) for heating highly
viscous liquids, or to "thaw out" liquids which have congealed
in the pumping chamber and packing area. Refer to the
'Technical Data' table on page 2 for the maximum allowable
steam pressure.
Make sure heat is applied early enough to sufficiently thin the
liquid before starting the pump. Liquids that congeal in the
relief valve chamber will make the valve inoperative.
Insulation of the pump with sufficient heat to the jackets will
usually thin the liquid in the relief valve chamber. Take
precautions to ensure the valve has free movement. It is
advisable to start the pump with an open discharge.
Drain the pump of all water when there is a possibility of
freezing. On models which have the steam connections on
the vertical center line, make the lower connection the outlet
so the water can be drained off. Models which have the
steam connections on the side also have a bottom drain plug.

104-A00 Page 5/16
OPERATION
Do not operate
without guard
in place
Operation without guards in place can
cause serious personal injury, major
property damage, or death.
Hazardous pressure
can cause personal
injury or property
damage
Disconnecting fluid or pressure
containment components during pump
operation can cause serious personal
injury, death or major property damage
Hazardous pressure
can cause personal
injury or property
damage
Failure to relieve system pressure prior
to performing pump service or
maintenance can cause personal injury
or property damage.
Hazardous pressure
can cause personal
injury or property
damage
Pumps operating against a closed valve
can cause system failure, personal
injury and property damage
PRE-START UP CHECK LIST
1. Check the alignment of the pipes to the pump. Support
pipes so that they do not spring away or drop down when
pump flanges or union joints are disconnected.
2. Verify proper coupling alignment.
3. Blackmer helical gear reducers (if supplied) are shipped
from the factory without oil in the gearcase. Fill with the
grade of oil indicated on the reducer tag. For more
specific instructions on Blackmer gear reducers, refer to
the appropriate Gear reducer Installation, Operation and
Instruction Manual.
4. Check the entire pumping system to verify that the
proper inlet and discharge valves are fully open, and that
the drain valves and other auxiliary valves are closed.
5. Install vacuum and pressure gauges on the pump in the
1/4” NPT connections provided. These can be used to
check actual suction and discharge conditions after
pump start-up.
6. Check the wiring of the motor, and briefly turn on the
power to make sure that the pump rotates in the
direction of the rotation arrow.
START UP PROCEDURES
NOTICE:
Consult the "general pump troubleshooting" section of
this manual if difficulties during start up are
experienced.
1. Start the motor. Priming should occur within one minute.
2. Check the vacuum and pressure gauges to see if the
pump is operating within the expected conditions.
3. Check for leakage from the piping and equipment.
4. Check for overheating, excessive noise or vibration
of the pump, reducer, and motor.
5. Check the flow rate to ensure the pump is
operating within the expected parameters. Record
flow rate in the "initial Start Up Information"
section.
6. Check the pressure setting of the relief valve by briefly
closing a valve in the discharge line and reading the
pressure gauge. This pressure should be 20 psi (1.4 bar)
higher than the maximum operating pressure.
CAUTION: Do not run the pump for more than 15
seconds with the discharge valve completely closed.
If adjustments need to be made, refer to "Relief Valve
Setting & Adjustment."
Hazardous pressure
can cause personal
injury or property
damage
Incorrect settings of the pressure relief
valve can cause pump component
failure, personal injury, and property
damage.

104-A00 Page 6/16
OPERATION
RUNNING THE PUMP IN REVERSE ROTATION
NOTICE:
Operate the pump in reverse rotation for no more than 10
minutes and only when a separate pressure relief valve
is installed to protect the pump from excessive pressure.
It may be desirable to run the pump in reverse rotation for
system maintenance. The pump will operate satisfactorily in
reverse rotation for a LIMITED time, at a reduced
performance level.
FLUSHING THE PUMP
NOTICE:
If flushing fluid is to be left in the pump for an extended
time, it must be a lubricating, non-corrosive fluid. If a
corrosive or non-lubricating fluid is used, it must be
flushed from the pump immediately.
1. To flush the pump, run the pump with the discharge
valve open and the intake valve closed. Bleed air into
the pump through the intake gauge plug hole or through
a larger auxiliary fitting in the intake piping. Pump air for
30 second intervals to clean out most of the pumpage. A
drain plug is provided on the bottom of the cylinder to
facilitate cleaning.
2. Run a system compatible flushing fluid through the pump
for one minute to clear out the remainder of the original
pumpage. Restrict a valve in the discharge line to build
up 10 psi (0.7 bar) to force flushing liquid through the
bearing seal chamber.
3. To flush out the pressure relief valve (if equipped), close
the valve in the discharge line for 15 seconds while
pumping the flushing liquid.
4. If necessary, repeat steps 2 and 3.
5. To remove the flushing fluid, follow step 1 above.
NOTICE:
After flushing the pump some residual fluid will remain
in the pump and piping.
NOTICE:
Properly dispose of all waste fluids in accordance with
the appropriate codes and regulations.

104-A00 Page 7/16
OPERATION
PUMP RELIEF VALVE
Hazardous pressure
can cause personal
injury or property
damage
An external bypass valve and/or an
internal relief valve MUST be installed in
the system to protect the pump from
excessive pressure.
Hazardous pressure
can cause personal
injury or property
damage.
Incorrect bypass valve or internal relief
valve settings can cause pump
component failure, personal injury, and
property damage.
WARNING
Internal bypassing of liquid elevates liquid temperature.
Only use the internal relief valve for brief periods and at
differential pressures below 125 psi (8.6 bar). For
extended periods or higher pressures, internal bypass
port must be plugged and the liquid returned back to the
source.
1.25 – 2.5’ size SNP pumps are offered with an optional relief
valve assembly which is bolted onto the pump casing. The
valve may be used as an internal relief valve, or as an
external bypass, piped back to the storage tank (see Figure
4). Its purpose is to protect the pump or pumping system
from excessive pressure. The valve is not meant to be used
for prolonged recirculation. If the optional Blackmer relief
valve is not fitted, an external bypass valve MUST be fitted.
The 3“ SNP is fitted with an internal pressure relief valve that
bypasses internally back to the suction side of the pump.
When pumping highly volatile liquids under a high suction lift,
and cavitation or starving of the pump exists, partial closing
of the discharge valve will result in excessive noise in the
relief valve. Plumbing the relief valve so flow is directed back
to the storage tank or adding an external back-to-tank bypass
valve is recommended when operating under these
conditions.
Figure 4 – Relief Valve
RELIEF VALVE SETTING AND ADJUSTMENT
The relief valve pressure setting is marked on a metal tag
attached to the valve cover. Set the relief valve at least 15 -
20 psi (1.0 - 1.4 Bar) higher than the operating pressure, or
the external bypass valve setting (if equipped).
Hazardous pressure
can cause personal
injury or property
damage
Incorrect settings of the pressure relief
valve can cause pump component
failure, personal injury, and property
damage.
Hazardous or toxic
fluids can cause
serious injury.
Relief valve cap is exposed to pumpage
and will contain some fluid
DO NOT remove the R /V Cap OR adjust the relief valve
pressure setting while the pump is in operation.
1. To INCREASE the pressure setting, remove the relief
valve cap (1), loosen the locknut (3), and turn the
adjusting screw inward, or clockwise. Replace the valve
cap.
2. To DECREASE the pressure setting, remove the relief
valve cap (1), loosen the locknut (3), and turn the
adjusting screw outward, or counterclockwise. Replace
the valve cap.
Refer to the individual Blackmer pump parts lists for various
spring pressure ranges. Unless specified otherwise, pumps
are supplied from the factory with the relief valve adjusted to
the mid-point of the spring range.

104-A00 Page 8/16
MAINTENANCE
Hazardous
machinery can
cause serious
personal injury.
Failure to disconnect and lockout
electrical power or engine drive before
attempting maintenance can cause
severe personal injury or death
Hazardous
machinery can
cause serious
p
ersonal in
j
ur
y
.
Failure to stop the pump before
adjusting the shaft packing can cause
severe personal injury.
Hazardous pressure
can cause personal
injury or property
damage
Failure to relieve system pressure prior
to performing pump service or
maintenance can cause personal injury
or property damage.
Hazardous voltage.
Can shock, burn or
cause death.
Failure to disconnect and lockout
electrical power before attempting
maintenance can cause shock, burns or
death
Hazardous pressure
can cause personal
injury or property
damage
Disconnecting fluid or pressure
containment components during pump
operation can cause serious personal
injury, death or major property damage
Hazardous or toxic
fluids can cause
serious injury.
If pumping hazardous or toxic fluids,
system must be flushed and
decontaminated, inside and out, prior to
performing service or maintenance
NOTICE:
Maintenance shall be performed by qualified technicians
only. Following the appropriate procedures and
warnings as presented in this manual.
SCHEDULED MAINTENANCE
STRAINERS
Strainers must be cleaned regularly to avoid pump starvation.
Schedule will depend upon the application and conditions.
LUBRICATION NOTICE:
To avoid possible entanglement in moving parts do not
lubricate the gear reducer or any other parts while the
pump is running.
Sleeve bearings (bushings) are lubricated by the liquid being
pumped. Additional lubrication is not required.
IF EQUIPPED: Blackmer gear reducers are shipped from the
factory without oil in the gearcase. Fill with the grade of oil
indicated on the reducer tag. Change the oil after the first 48
hours of use and approximately every 500 hours of use
thereafter.
VANE REPLACEMENT
NOTICE:
Maintenance shall be performed by qualified technicians
only. Follow the appropriate procedures and warnings
as presented in manual.
1. Remove the head assembly and all other parts on the
outboard (non-driven) side of the pump. See the "Pump
Disassembly" Section.
2. Turn the shaft by hand until a vane (14) comes to the top
(12 o'clock) position of the rotor.
Figure 5 – Vane Replacement
3. Remove and replace the vane, making sure to install the
vane with the rounded edge outward to contact the
cylinder.
4. Rotate the shaft until the next rotor slot is in the top
position, and replace the vane.
5. Continue this procedure until all new vanes are in place.
6. Reassemble the pump as instructed in "Pump
Assembly."

104-A00 Page 9/16
MAINTENANCE
PUMP DISASSEMBLY
NOTICE:
Follow all hazard warnings and instructions provided in
the “Maintenance” section of this manual.
NOTE: The numbers in parentheses following individual parts
indicate reference numbers on the Pump Parts List.
1. On the outboard (non-driven) side of the pump, remove
the head capscrews (21A), head (23) and disc (71).
Avoid damaging the head seal ring (72) and disc (71).
NOTE: The sleeve bearing (bushing) (24) is press fit into
the head and should not be removed unless replacement
is necessary (see "Sleeve Bearings").
2. Turn the shaft by hand until a vane (14) comes to the top
(12 o'clock) position of the rotor. Remove each vane in
turn.
3. On the opposite (inboard) end of the pump, clean the
pump shaft thoroughly, making sure the shaft is free of
nicks, burrs, or paint that might damage the packing or
mechanical seal when the inboard head is removed.
4. PUMPS EQUIPPED WITH PACKING
a. Remove the packing locknuts (18), studs (17) and
packing follower (75).
b. Remove the head capscrews (21), bracket (108),
head (20) and disc (71). Avoid damaging the head
seal ring (72) and disc (71). NOTE: The sleeve
bearing (24) is press fit into the head and should not
be removed unless replacement is necessary (see
"Sleeve Bearings").
c. The packing rings (19) and packing washer (58) can
be pulled from the inboard hub with the use of a
corkscrew tool or screwdriver.
Figure 6 – Commercial Mechanical Seal
5. PUMPS EQUIPPED WITH BLACKMER TRIPLE-LIP
SEAL OR A COMMERCIAL MECHANICAL SEAL
a. Loosen all setscrews before removing the head
assembly. For further instructions on the
disassembly and assembly of commercial
mechanical seals, refer to the separate literature
accompanying the seal.
b. Remove the head capscrews (21), bracket (108),
head (20) and disc (71). Avoid damaging the head
seal ring (72) and disc (71). NOTE: The sleeve
bearing (24) is press fit into the head and should not
be removed unless replacement is necessary (see
"Sleeve Bearings").
6. From the driven side of the pump, grasp the rotor in the
3 and 9 o'clock positions, and gently pull the rotor and
shaft (13) out of the cylinder. CAUTION: Use care to
avoid injury-the rotor and shaft is heavy and may have
sharp edges.
PARTS REPLACEMENT
1. If any of the O-rings have been removed or disturbed
during disassembly, they must be replaced with new O-
rings. NOTE: PTFE O-rings should be heated in hot
water to aid installation.
2. Excessive or continuous leakage around the pump shaft
may be an indication of a damaged mechanical seal,
worn packing, or a damaged or worn sleeve bearing.
a. If a mechanical seal has been leaking, it is
recommended the entire seal be replaced. Refer to
"General Pump Troubleshooting" for possible
causes of seal leakage.
b. If the packing is leaking excessively, refer to
"Packing Adjustment." If this does not solve the
problem, a complete new set of packing rings
should be installed.
c. If the pump shaft indicates an excessive amount of
radial "play," the sleeve bearing in the hub should be
replaced.
3. Worn or scored discs may be reused if interchanged
from one head to the other with the new side toward the
rotor.

104-A00 Page 10/16
MAINTENANCE
Figure 7a – Sleeve Bearing Alignment
Figure 7b – Sleeve Bearing Installation
4. SLEEVE BEARINGS (Bushings)
If the sleeve bearing has been removed from the head, a new
bearing must be installed.
a. To aid installation, heat the head in an oven at
200°F (93°C) before installing the bearing.
b. Coat the new bearing with a quality grade of bearing
grease, and place it on the inside face of the head
with the notched end UP. Align the notch in the
bearing with the groove in the head. See figure
7a.
c. Using an arbor press, press the bearing into the
head in one continuous motion, until it is flush with
(or slightly below) the inside face of the head.
Starting and stopping the pressing motion may
result in a cracked bearing.
d. Ensure that the hole in the face of the head is open
after inserting the bushing. See figure 7a.
5. CYLINDER BORE
Examine the cylinder bore carefully for tiny ‘pin head’
projections caused by foreign material in some fluids.
Carefully scrape off the small projections and smooth the
bore with emery as needed.

104-A00 Page 11/16
MAINTENANCE
PUMP ASSEMBLY
Before reassembling the pump, inspect all component
parts for wear or damage, and replace as required. Wash
out the bearing/seal recess of the head and remove any
burrs or nicks from the rotor and shaft.
1. Place a small amount of Moly-grease on all capscrews
before assembly to prevent galling.
2. Start with the OUTBOARD side of the pump.
Figure 8 – Hole in Disc
3. Place the outboard disc (71) and seal ring (72) on the
cylinder (12) so that the hole in the disc will be toward
the INTAKE side of the pump. See Fig. 8.
4. Place the outboard head (23) on the cylinder (12) with
the suction groove toward the bottom, using the dowel
pin (25A) for alignment. See Figure 8.
a. Model SNPJ2.5: Place the O-rings (72A and 72B)
and the steam jacket (59) on the head.
b. All Models: Tighten the head capscrews evenly to
ensure that the head is properly seated and the seal
ring fully compressed.
c. Secure the bearing cover (27) and seal ring (26) to
the head with the four capscrews (28).
Figure 9 – Pushrod Installation
5. Rotor and Shaft
a. Install the pushrods and the 2 (or 3) bottom vanes
into the rotor. The rounded edge of the vanes must
be ouward to contact the bore of the cylinder and
the relief grooves facing in the direction of rotation.
See Figs. 5 and 9
b. Holding the vanes in place, install the rotor/shaft into
the cylinder using care not to damage the disc or
shaft.
c. Turn the shaft by hand until an empty slot comes to
the 12 o’clock position, insert a vane, and move on
to the next slot.
6. Place the inboard disc (71) and seal ring (72) on the
cylinder (12) so that the hole in the disc will be toward
the INTAKE side of the pump. See Fig. 8.
7. Place the inboard head over the shaft and against the
cylinder (12) with the suction groove toward the bottom,
using the dowel pin (25A) for alignment. See Figure 8.
a. Jacketed Models: Place the O-rings (72A and 72B)
on the head.
b. All models except the SNP3A: Place the Bracket /
Jacket (108 or 59) onto the head.
c. All models: Tighten the head capscrews evenly to
ensure that the head is properly seated and the seal
ring fully compressed.
Figure 10 - Packing
8. PACKING AND PACKING FOLLOWER
When necessary to repack, use a full set of new packing
rings. Packing is furnished in sets with the correct number of
rings. Never add new rings to an old set of packing.
a. Insert the packing washer (58) into the stuffing box
of the inboard hub.
b. Insert each packing ring (19) separately into the
stuffing box, using the packing follower (75) to
properly seat each ring after placement. Be sure to
stagger the split joints approximately 180 degrees
apart so that they are not overlapping or near the
joint of the preceding ring.
c. Install and tighten the two packing follower studs
(17).
d. Place the packing follower (75) snugly against the
packing. Install the two packing follower stud nuts
(18) and tighten lightly. NOTE: Adjustment to the
packing follower should be made while pumping
liquid (see "Packing Adjustment").

104-A00 Page 12/16
MAINTENANCE
Hazardous
machinery can
cause serious
p
ersonal in
j
ur
y
.
Failure to stop the pump before
adjusting the shaft packing can cause
severe personal injury.
9. PACKING ADJUSTMENT
Packing must be properly adjusted to prevent overheating.
a. While the liquid is being pumped, check for leakage
from the stuffing box. STOP the pump and uniformly
tighten the packing follower stud nuts (18) 1/4 turn at
a time to reduce leakage.
b. Restart the pump and check the stuffing box
temperature several minutes after each adjustment
for signs of overheating.
c. Check the packing again after 20-30 minutes of
running the pump, and readjust if necessary.
NOTE: Some leakage is desirable to lubricate the
packing, but in some cases is unacceptable,
depending on the application.
10. BLACKMER TRIPLE-LIP SEAL (if equipped)
On pumps equipped with a Blackmer triple-lip seal, refer to the
separate literature accompanying the triple-lip seal for
installation instructions.
11. COMMERCIAL MECHANICAL SEAL (if equipped)
On pumps equipped with a commercial mechanical seal, refer
to the separate literature accompanying the mechanical seal
for installation instructions.
12. SHAFT SUPPORT BEARING (SNP3A if equipped)
a. Screw the short threaded ends of the two hex studs
(106E) firmly into the holes in the head.
b. Place the bearing flange (106) on the studs and tighten
the locknuts (106A).
c. Slide the bearing and lock collar (106B) on the shaft
until it is firmly seated in the bearing flange (106A).
d. Push inward on the bearing and lock collar (106B)
while turning the lock collar by hand in the same
direction as the shaft rotation.
e. Lock the collar to the shaft with a punch in the same
direction as the shaft rotation. See Fig. 11.
f. Bolt on the flange cover (106C).
g. If the shaft does not turn freely, loosen the lock collar
and make sure the bearing is firmly seated in the
bearing flange (106). Re-tighten the lock collar.
Figure 11 – Shaft Support Bearing Lock Collar
13. RELIEF VALVE ASSEMBLY (if equipped)
a. Insert the valve (9) into the relief valve body (6) with
the fluted end inward.
b. Install the relief valve spring (8) and spring guide (7)
against the valve.
c. Attach a new relief valve gasket (10) and the valve
cover (4) on the relief valve body (6).
d. Screw the relief valve adjusting screw (2) into the
valve cover until it makes contact with the spring
guide (7).
e. Install the relief valve cap (1) and gasket (88) after
the relief valve has been precisely adjusted.
NOTICE:
The relief valve setting MUST be tested and
adjusted more precisely before putting the pump
into service. Refer to "Relief Valve Setting and
Adjustment"
14. Reinstall coupling, shaft key, and coupling guards.
Do not operate
without guard in
place.
Operation without guards in place can
cause serious personal injury, major
property damage, or death.
15. Refer to “Pre-Start Up Check List” and “Start Up
Procedures” sections of this manual prior to pump
operation.

104-A00 Page 13/16
TROUBLESHOOTING
NOTICE:
Maintenance shall be performed by qualified technicians only,
following the appropriate procedures and warnings as presented in this manual.
LEAKAGE
Location Probable Cause/Corrective Action
Between the head & casing Damaged head O-ring: Inspect and replace if necessary.
Burrs/dirt in head O-ring groove or cylinder: File and clean as
necessary.
Around the shaft Packing: Adjust the packing. If this does not solve the problem, replace
the packing with a complete new set.
NOTE: On pumps equipped with packing, some leakage is necessary,
and in some cases is desirable, depending on the application.
Damaged shaft surface: Check the surface of the shaft in the seal area
for damage. File any small burrs or ridges. If damage is severe, replace
rotor & shaft.
New Mechanical Seals: New seals may leak slightly at start up, but
should seal up shortly thereafter.
Damaged mechanical seals: Check for damaged O-rings or cracked,
scratched or worn seal faces
SHAFT BINDING
Probable Cause Corrective Action
Burrs, dirt or foreign particles on the heads or discs. During assembly, both heads and discs must be clean and smooth. File
any burrs or rough spots, and wipe the discs with a clean cloth and
alcohol to remove any dirt or foreign particles.
Excessively tight packing. Refer to "Packing Adjustment".
Contaminated mechanical seal faces. Any trace of grease or dirt on the seal faces will prevent the faces from
mating properly, causing the rotor and shaft to bind or turn hard. Use a
tissue paper & alcohol to clean the seal faces. NOTE: Apply a light oil
or suitable lubricant to bronze seal faces only.
Other possible causes of shaft binding --------------------------------------------------------------------------------------------------
• Foreign particles on rotor, liner or vanes.
• Damaged vanes or rotor.
• Bent push rods.
• Liquids that "set up" when inactive.
OVERHEATING
Location Probable Cause/Corrective Action
Pump equipped with internal relief valve. Continual, full bypassing of the liquid: Properly adjust the relief
valve so that the pump will not bypass during normal operation.
WARNING: Internal bypassing of liquid elevates the liquid
temperature. Only use the internal bypass valve for brief periods
and at differential pressures below 125 psi.
For extended periods of higher pressures, the internal bypass
port must be plugged and the liquid returned back to the source.
Pumps with packing. Packing: NEVER tighten the packing without checking afterward for
overheating. If packing is old or worn, it will overheat and should be
replaced.
Other possible causes of overheating ----------------------------------------------------------------------------------------------------
• Improper relief valve adjustment
(See "Relief Valve").
• Plugged discharge line.
• Closed valve.
LOW DELIVERY RATE
Probable Cause Corrective Action
Relief valve setting too low, causing the liquid to bypass. Set the relief valve 20 psi (1.4 bar) higher than the differential pressure.
Other possible causes of a low delivery rate ------------------------------------------------------------------------------------------
•Restriction in the suction line.
•Resistance in the discharge line.
•Air leaks in the suction line.
•Damaged or worn pump parts.
•Pump speed too low or too high.
•Relief valve leaking.
•Relief valve sticking open, or not properly seating.
•Dirty strainer.

104-A00 Page 14/16
TROUBLESHOOTING …. continued
EXCESSIVE NOISE AND VIBRATION
Probable Cause Corrective Action
Cavitation or vaporization of the liquid resulting from
excessive vacuum on the pump due to starved suction. Check for:
•Inlet piping too long or too small in diameter.
•Strainer plugged or dirty.
•Undersized or restrictive fittings, such as globe valves or partially
closed valves.
•Excessive amount of elbows.
•Suction lift too great.
•Pump speed too high for the viscosity of the liquid being pumped.
Entrained air or vapors in the pump. Check pipe joints for leakage of air. Sometimes when recirculating
liquid in a tank, the returning liquid falling through the air carries air
down into the tank, which eventually gets back into the pump.
Pump speeds exceed the recommended maximum. Check the recommended RPM for your specific application.
Continual or long term bypassing of liquid through relief
valve. Check for restriction in the discharge line, or an improper relief valve adjustment (See "Relief Valve" on Page 6).
Other possible causes of noise and vibration
•Excessively worn vanes or discs.
•Sleeve Bearing (Bushing) Worn or Damaged.
•Loose or improperly installed piping.
•Misalignment of pump and driver.
•Pump base not properly mounted.
•Insufficient Oil in the Gear Reducer
POOR OR NO PRIMING
Probable Cause
•Air leaks in the suction line.
•Restriction in the suction line.
•Damaged or worn pump parts.
•Too much lift for the vapor pressure of the fluid.
•A dirty or clogged strainer.
•Worn vanes.
•Suction Valve Closed.
•Incorrect pump rotation
•Relief Valve partially open, valve not seating properly.
DAMAGED VANES
Probable Cause
•Foreign objects entering the pump.
•Running the pump dry for extended periods of time.
•Cavitation.
•Viscosity too high for the vanes and /or the pump
speed.
•Incompatibility with the liquids pumped.
•Excessive heat.
•Worn or bent push rods, or worn push rod holes.
•Settled or solidified material in the pump at start-up.
•Hydraulic hammer - pressure spikes.
•Vanes installed incorrectly (see"Vane Replacement").
BROKEN SHAFT
Probable Cause
•Foreign objects entering the pump.
•Viscosity too high for the pump speed.
•Relief valve not opening.
•Hydraulic hammer - pressure spikes.
•Pump/driver, driveline/drive shaft misalignment.
•Excessively worn vanes or vane slots.
•Settled or solidified material in the pump at start-up.
•Overtightened V-belts, if used.
SEAL LEAKAGE
Probable Cause
•O-rings not compatible with the liquids pumped.
•O-rings nicked, cut or twisted.
•Shaft at seal area damaged, worn or dirty.
•Pump sleeve bearings (bushings) worn excessively.
•Excessive cavitation.
•Mechanical seal faces cracked, scratched, pitted or dirty.
MOTOR OVERLOAD
Probable Cause
•Horsepower of motor not sufficient for application
•Improper wire size / wiring and/or voltage to motor.
•Misalignment in pump drive system.
•Excessive viscosity, pressure or speed.
•Faulty or worn bearings.
•Rotor rubbing against head or cylinder.
•Dirty mechanical seal faces.

104-A00 Page 15/16
NOTES

Sliding Vane Pumps:5 to 2200 GPM
Refined Fuels, Liquefied Gases, Solvents,Process
Stainless Steel Sliding Vane Pumps
1 to 265 GPM: Acids, Brines, Sugars, Syrups,
Beer, Beet Juice, Cider, Flavor Extracts, etc.
System One
®
CentrifugalPumps
10 to 7500 GPM; Process, Marine
Magnetic Drive Pumps
Stainless Steel:14 to 215 GPM
Abaque Peristaltic Hose Pumps
0.1 to 210 GPM
High Lift, Solids, Abrasives
Reciprocating Gas Compressors
Liquefied Gas Transfer, Boosting, Vapor Recovery
Hand Operated Pumps
Dispensing, Transfer, In-line
Accessories
Gear Reducers, Bypass Valves, Strainers
Distributed by:
"DAIS GLOBAL " LTD 3, Poruchik Nedelcho Bonchev Str., . 5 1528 Soa, Bulgaria
tel: [phone], e-mail: o[email protected]