BLACKMER LGF1D Manual

BLACKMER POWER PUMPS 960400
INSTRUCTIONS. 501-A00_1103
INSTALLATION OPERATION AND MAINTENANCE INSTRUCTIONS
DISCONTINUED MODELS: LGF1D, LGB1D, LGF1PD, LGB1PD,
Section
Effective
Replaces
501
Mar 2011
Aug 2010
LGF1C, LGB1C, LGF1PC, LGB1PC
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 Relief Valve and Bypass valve....................3
Check Valves ........................................................4
Mounting ...............................................................4
Coupling Alignment...............................................4
Pump Rotation.......................................................4
OPERATION
Pre-Start Up Check List.........................................5
Start Up Procedures..............................................5
Relief Valve Setting and Adjustment.....................5
MAINTENANCE
Strainers...................................................................6
Lubrication................................................................6
Vane Replacement...................................................7
Pump Disassembly ..................................................7
Parts Replacement...................................................8
Pump Assembly.......................................................8
TROUBLE SHOOTING .................................................11
Numbers in parentheses following individual parts indicate
reference numbers on Blackmer Parts List No. 501-A01.
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 liquefied gas 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 liquefied gas pumps,
and MUST be kept with the pump.
Blackmer liquefied gas 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 Blackmer liquefied gas pumps.
Maintain ALL system and Blackmer liquefied gas
pump operation and hazard warning decals.

501-A00 Page 2/12
SAFETY DATA
Failure to disconnect and lockout
electrical power or engine drive before
attempting maintenance can cause
severe personal injury or death
Failure to disconnect and lockout
electrical power before attempting
maintenance can cause shock, burns or
death
Hazardous
machinery can
cause serious
personal injury. Hazardous voltage.
Can shock, burn or
cause death.
Disconnecting fluid or pressure
containment components during pump
operation can cause serious personal
injury or property damage.
Failure to relieve system pressure prior
to performing pump service can cause
serious personal injury or property
damage. Systems with meters will still
be pressurized even after the hose is
emptied
Hazardous pressure
can cause serious
personal injury or
property damage Hazardous pressure
can cause serious
personal injury or
property damage
If pumping hazardous or toxic fluids,
system must be flushed and
decontaminated, inside and out, prior to
performing service or maintenance
Operation without guards in place can
cause serious personal injury, major
property damage, or death.
Hazardous or toxic
fluids can cause
serious injury. Do not operate
without guard
in place
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
Maximum Pump Speed 1,750 RPM
Maximum Operating Temperature 240°F
(
115°C
)
Maximum Differential Pressure 125 psi
(
8.6 Bar
)
Maximum Working Pressure 350 psi
(
24.1 Bar
)
Technical Data is for standard materials of
construction. Consult Blackmer Material Specs for
optional materials of construction.
These pumps are listed by Underwriters’ Laboratories
for liquefied petroleum gas and NH3service.
INITIAL PUMP START UP INFORMATION
Model No.: ____________________________________
Serial No.: ____________________________________
ID No.: _______________________________________
Date of Installation: _____________________________
Inlet Gauge Reading: ____________________________
Discharge Gauge Reading: _______________________
Flow Rate: _____________________________________

501-A00 Page 3/12
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.
NOTICE:
This pump shall be installed in accordance with the
requirements of NFPA 58 all applicable local, state and
national regulations.
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.
Hazardous voltage.
Can shock, burn or
cause death.
Motors equipped with thermal protection automatically
disconnect motor electrical circuit when overload exists.
Motor can start unexpectedly and without warning.
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 will 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 should be at least as large as the intake
port on the pump. It should slope downward to the pump,
and should not contain any upward loops. Eliminate
restrictions such as sharp bends; globe valves,
unnecessary elbows, and undersized strainers.
3. A strainer must be installed in the inlet line to protect the
pump from foreign matter. The strainer should be located
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.
4. The intake and discharge piping system must be free of
all leaks.
5. 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.
6. ALL piping and fittings MUST be properly supported to
prevent any piping loads from being placed on the pump.
7. Install pressure gauges in the NPT ports provided in the
pump casing to check pump performance at start up.
8. Check alignment of pipes to pump to avoid strains, which
might later cause misalignment. See Figure 2. 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 2
9. The external bypass line should be 1/2" (12.7 mm)
diameter pipe and can be piped back to either the liquid
or vapor section of the tank. See Figure 3
10. The use of a vapor return line will speed up delivery by
preventing pressure build up at the receiving tank and
pressure reduction in the supply tank.
11. Keeping the liquefied gas systems full of liquid, even
when idle, will keep the O-rings from changing shape,
shrinking or super cooling. Evaporation of liquefied gas
leaves an abrasive powder on the surface which can
cause wear to the pump, meter, and seals.
COMBINATION PUMP RELIEF VALVE AND
BACK-TO-TANK BYPASS VALVE
The built-in spring loaded pump relief valve on the LG1 pump
models has a dual purpose. The valve provides an external
bypass back to the tank to provide relief of excess pressure.
The valve also will act as an internal relief valve recirculating
fluid within the pump to provide relief of excess pressure if the
separate back-to-tank line is closed. See Figure 3. Refer to
“Relief Valve Setting and Adjustment” for proper valve setting
and adjustment procedure.
Figure 3
Bypass Valve
Mounting

501-A00 Page 4/12
INSTALLATION
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.
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 4. This arrangement allows for slight
shifting of position to accommodate alignment with the
mounting holes in the base plate.
For new foundations, it is suggested that the anchor bolts be
set in concrete. When pumps are to be located on existing
concrete floors, holes should be drilled 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. Shims should be used
under the edges of the base prior to tightening of the anchor
bolts to prevent distortion.
BOLT
BASE
STANDARD
PIPE
WASHER
Figure 4 – Pipe Type Anchor Bolt
COUPLING ALIGNMENT
The pump must be directly coupled to a gear reducer 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 5.
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 should be less than
.005" (0.127 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 should not exceed 0.005" (0.127 mm). Some
laser alignment tools will check angular alignment as well.
3. Replace the coupling guards after setting alignment.
Figure 5 – Coupling Alignment
Operation without guards in place can
cause serious personal injury, major
property damage, or death.
Do not operate
without guard
in place
PUMP ROTATION
These pump models are designed as RIGHT-HAND
(Counterclockwise) rotation pumps ONLY when viewed from
the driven end. When viewed from the non-drive end (pump
end), the pump intake port and relief valve must always be on
the left, and the discharge port on the right.
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.

501-A00 Page 5/12
OPERATION
Operation without guards in place can
cause serious personal injury, major
property damage, or death.
Do not operate
without guard
in place
Failure to relieve system pressure
prior to performing pump service can
cause serious personal injury or
property damage. Systems with
meters will still be pressurized even
after the hose is emptied
Hazardous pressure
can cause serious
personal injury or
property damage
Disconnecting fluid or pressure
containment components during pump
operation can cause serious personal
injury or property damage.
Hazardous pressure
can cause serious
personal injury or
property damage
Pumps operating against a closed
valve can cause system failure,
personal injury and property damage
Hazardous pressure
can cause personal
injury or property
damage
PRE-START UP CHECK LIST
1. Check the alignment of the pipes to the pump. Pipes
should be supported so that they do not spring away or
drop down when pump flanges or union joints are
disconnected.
2. Verify proper coupling alignment.
3. 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.
4. Install suction and discharge pressure gauges on the
pump in the threaded connections provided. These can
be used to check actual suction and discharge conditions
after pump start-up.
5. Check the wiring of the motor.
6. Briefly start the pump to verify proper rotation direction.
START UP PROCEDURES
NOTICE:
Consult the "General Pump Troubleshooting" section of
this manual if difficulties during start up are experienced.
1. SLOWLY build pressure in the pump.
2. Start the pump. Priming should occur within one minute.
3. Check the suction and discharge pressure gauges to see
if the pump is operating within the expected conditions.
4. Check for leakage from the piping and equipment.
5. Check for excessive noise, vibration or overheating of the
pump, reducer, and motor.
6. If possible, check the flow rate.
7. With the manual valve in the bypass line OPEN, check
the pressure setting of the relief valve by slowly closing a
valve in the discharge line and reading the pressure
gauge. As the valve in the discharge line is closed, the
pump discharge pressure will rise to a maximum value,
then drop back slightly. Use the maximum pressure to
determine the valve setting. This pressure should be 10 -
20 psi (0.7 -1.4 bar) higher than the maximum system
operating pressure. If adjustments need to be made,
refer to the "Relief Valve Setting and Adjustment" section
of this manual.
8. An external bypass valve, if used, must be set at least 25
psi (1.7 bar) lower than the internal pump relief valve.
NOTE: The normal operating pressure must be at least 5
- 15 psi (0.3 -1.0 bar) less than the external bypass valve
setting.
NOTE: If the pump is operated with both the discharge line
and bypass line closed, the pump will recirculate fluid through
the internal relief valve, causing cavitation and excessive
wear on the pump. The pressure gauge may also read lower
than with normal operation.
RELIEF VALVE SETTING AND
ADJUSTMENT
The relief valve pressure setting is marked on a metal tag
attached to the valve cover. Generally, the relief valve should
be set at least 10 - 20 psi (0.7 - 1.4 Bar) higher than the
operating pressure, or any external bypass valve setting.
DO NOT adjust the relief valve pressure setting while the
pump is in operation.
1. To INCREASE the pressure setting, loosen the locknut,
and turn the adjusting screw inward, or clockwise.
Retighten the locknut
2. To DECREASE the pressure setting, loosen the locknut,
and turn the adjusting screw outward, or
counterclockwise. Retighten the locknut
Incorrect settings of the pressure relief
valve can cause pump component
failure, personal injury, and property
damage.
Hazardous pressure
can cause serious
personal injury or
property damage

501-A00 Page 6/12
MAINTENANCE:
Failure to disconnect and lockout
electrical power or engine drive before
attempting maintenance can cause
severe personal injury or death
Failure to disconnect and lockout
electrical power before attempting
maintenance can cause shock, burns or
death
Hazardous
machinery can
cause serious
personal injury. Hazardous voltage.
Can shock, burn or
cause death.
Disconnecting fluid or pressure
containment components during pump
operation can cause serious personal
injury or property damage.
Failure to relieve system pressure prior
to performing pump service can cause
serious personal injury or property
damage. Systems with meters will still
be pressurized even after the hose is
emptied
Hazardous pressure
can cause serious
personal injury or
property damage Hazardous pressure
can cause serious
personal injury or
property damage
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. Follow the appropriate
procedures and warnings as presented in this
manual.
Hazardous or toxic
fluids can cause
serious injury.
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 pump bearings or any other parts while pump is
running
Pump bearings should be lubricated every one to twelve weeks
(AT MINIMUM), depending on the application, and operating
conditions.
Recommended Grease:
Mobil® - Mobilgrease XHP222,
Exxon® - RONNEX MP Grease,
or equivalent.
Greasing Procedure:
1. Remove the grease relief fittings (76A) from the bearing
cover (27) and mounting bracket (108 or 108B).
2. SLOWLY apply grease with a hand gun until grease begins
to escape from the grease relief fitting port.
3. Replace the grease relief fittings (76A).
DO NOT overgrease pump bearings. While it is normal for
some grease to escape from the grease tell-tale hole after
lubrication, excessive grease on pumps equipped with
mechanical seals can cause seal failure.

501-A00 Page 7/12
MAINTENANCE:
VANE REPLACEMENT
NOTICE:
Maintenance shall be performed by qualified
technicians only. Following the appropriate procedures
and warnings as presented in manual.
NOTE: The numbers in parentheses following individual
parts indicate reference numbers on the Pump Parts List.
1. Drain and relieve pressure from the pump and system as
required.
2. If the pump shaft is protruding through the cylinder (12),
remove the head assembly from the pump according to
steps 4 - 8 in the "Pump Disassembly" section of this
manual. If the pump shaft is protruding through the head
(20), remove the entire pump from the mounting bracket
(108 or 108B) (See Step 3 in "Pump Disassembly") then
remove the head assembly from the pump according to
steps 5 - 8 in the "Pump Disassembly" section of this
manual.
3. Turn the shaft by hand until a vane (14) comes to the top
(12 o'clock) position of the rotor. Remove the vane.
4. Install a new vane (14), ensuring that the relief groove is
facing toward the direction of rotation. See Figure 6.
5. Repeat steps 3 and 4 until all vanes have been replaced.
6. Reassemble the pump according to the "Pump
Assembly." section of this manual.
ROUNDED EDGE OUT
RELIEF GROOVES
FACE IN DIRECTION
OF ROTATION
Figure 6 – Vane Replacement
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. Drain and relieve pressure from the pump and system as
required.
2. Loosen the coupling (34) and remove the shaft key (35).
3. Remove the four mounting screws (28A) and remove the
entire pump assembly from the bracket mount (108 or
108B).
4. Remove the bearing cover capscrews (28), the bearing
cover (27) and gasket (26) Discard the bearing cover
gasket.
5. Remove the locknut (24A) and lockwasher (24B) from the
shaft end protruding through the head (20):
a. Bend up the engaged lockwasher tang and rotate the
locknut counterclockwise to remove it from the shaft.
b. Slide the lockwasher off the shaft. Inspect the
lockwasher for damage and replace as required.
6. Clean the shaft portion protruding through the head
thoroughly, making sure the shaft is free of nicks and
burrs. This will prevent damage to the mechanical seal
when the head assembly is removed.
7. Remove the head capscrews (21) and carefully pry the
head (20) away from the cylinder.
8. Slide the head off the shaft. The head O-ring (72), bearing
(24), and mechanical seal (153) will come off with the head
assembly. Remove and discard the head O-ring.
9. Pull the bearing (24) from the housing in the head.
10. Place a cloth under the seal to prevent damage. Using a
blunt instrument, gently push the stationary seat (153B) to
remove it from the head. Be careful not to contact the seal
faces during removal.
11. Remove and discard the mechanical seal O-rings (153D
and 153G).
12. Remove the locknut (24A) and lockwasher (24B) from the
shaft end protruding through the cylinder (12):
a. Bend up the engaged lockwasher tang and rotate the
locknut counterclockwise to remove it from the shaft.
b. Slide the lockwasher off the shaft. Inspect the
lockwasher for damage and replace as required.
13. Clean the shaft protruding through the cylinder thoroughly,
making sure the shaft is free of nicks and burrs.
14. Gently pull the rotor and shaft (13) from the cylinder. While
one hand is pulling the shaft, the other hand should be
cupped underneath the rotor to prevent the vanes (14)
from falling out. Carefully set the rotor and shaft aside.
15. Remove vanes (14) from rotor and shaft (13).
16. Pull the bearing (24) from the cylinder.
17. Place a cloth under the seal to prevent damage. Using a
blunt instrument, gently push the stationary seat (153B) to
remove it from the head. Be careful not to contact the seal
faces during removal.
18. Remove and discard the mechanical seal O-rings (153D
and 153G).

501-A00 Page 8/12
MAINTENANCE:
PARTS REPLACEMENT
1. If any of the O-rings have been removed or disturbed
during disassembly, they must be replaced with new O-
rings.
2. Excessive or continuous leakage from the tell-tale hole in
the bearing cover may be an indication of a damaged
mechanical seal. 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.
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 cylinder and remove
any burrs or nicks from the rotor and shaft.
1. Position the pump cylinder (12) with the bearing side
up.
2. Apply a small amount of quality O-ring lubricant in the
seal and bearing recess of the cylinder to facilitate
mechanical seal (153) installation.
3. Insert the seal jacket assembly (153A) into the seal
recess of the cylinder with the drive tangs of the jacket
inward.
4. With the polished face outward, align the notches of the
rotating seal face with the jacket, and install the seal
face (153F) and O-ring (153G) into the jacket assembly.
After installation, clean the seal face with a clean tissue
and alcohol.
5. Clean the polished face of the stationary seat (153B)
with a clean tissue and alcohol.
6. Install new O-ring (153D) onto stationary seat (153B).
7. Align the notch in stationary seat (153B) with the anti-
rotation pin in the cylinder (12) and insert it into the seal
recess with the polished face inward to mate with the
rotating face.
8. Hand pack the ball bearing (24) with grease. Refer to
"Lubrication" in the Pump Maintenance Section for the
recommended grease.
9. Install the bearing (24) into the cylinder recess. The
bearing balls should face outward, with the grease
shield inward. Ensure that the bearing (24) is fully and
squarely seated against the mechanical seal (153).
10. Keep the bearing (24) from falling out of the cylinder
(12) by securing with one of the bearing cover
capscrews (28) and a washer that will catch the outer
ring of the bearing when tightened.
11. Turn the pump cylinder (12) over with the INTAKE port
and relief valve to the right.
12. The models described in this IOM are Right Hand
Rotation only. A Right-Hand rotation pump will have the
drive end of the shaft (long end) protruding through the
cylinder (12) with the bearing cover on the head.
13. Apply a light coating of quality O-ring lubricant to the
shaft end to be inserted into the cylinder.
14. Insert the shaft into the cylinder (12). Carefully slide the
shaft through the installed mechanical seal (153) and
bearing. Align the notch in the rotor with the drive tang
on the seal jacket of the mechanical seal. Rotate the
shaft to ensure the drive tangs of the mechanical seal
are engaged in the notches in the rotor.
15. Install lockwasher (24B) on the shaft protruding through
the bearing in the cylinder with the tangs outward. Ensure
the inner tang “A” of the lockwasher is engaged in the slot
in shaft threads. Bend it slightly, if necessary. (See Figure
8.)
16. Install locknut (24A) onto threads of shaft with the tapered
end inward.
17. Tighten the locknut (24A) with a spanner wrench to pull the
rotor flat against the back wall of the cylinder. DO NOT
overtighten the locknut and bend or shear the inner tang.
Adjustment to the locknuts will be made after the head is
installed.
18. Insert the vanes (14) into the slots in the rotor, ensuring
that the relief groove is facing toward the direction of
rotation. See Figure 6
19. Apply a light coating of quality O-ring lubricant in the seal
and bearing recess of the head (20) to facilitate
mechanical seal (153) installation.
20. Insert the seal jacket assembly (153A) into the seal recess
of the head with the drive tangs of the jacket inward.
21. With the polished face outward, align the notches of the
rotating seal face with the jacket, and install the seal face
(153F) and O-ring (53G) into the jacket assembly.
22. Clean the polished face of the stationary seat (153B) with
a clean tissue and alcohol.
23. Install new O-ring (153D) onto stationary seat (153B).
24. Align the notch in stationary seat (153B) with the anti-
rotation pin in the head (20). Insert it into the seal recess
with the polished face inward to mate with the rotating
face.
25. Hand pack the ball bearing (24) with grease. Refer to
"Lubrication" in the Pump Maintenance Section for the
recommended grease.
26. Install the bearing (24) into the head recess. The bearing
balls should face outward, with the grease shield inward.
Ensure that the bearing (24) is fully and squarely seated
against the mechanical seal (153).
27. Apply a small amount of quality O-ring lubricant to the O-
ring groove on the inside face of the head and install a
new head O-ring (72) in the groove by laying the O-ring flat
and starting in on one side of the groove, stretching ahead
with the fingers, as shown in Figure 7.
Figure 7 Head O-ring Installation

501-A00 Page 9/12
MAINTENANCE:
28. Apply a light coating of quality O-ring lubricant on the
shaft to facilitate head installation.
29. With the tell-tale hole towards the bottom of the pump,
carefully install the head assembly (20) over the shaft
and against the cylinder (12). Use care not to damage
the mechanical seal components. Align the drive tangs
of the mechanical seal with the notches in the rotor.
30. Rotate the head (20) to engage the drive tangs of the
seal jacket with the slots in the rotor.
31. Install and finger tighten the head capscrews (21). The
head capscrews will be fully tightened after the second
locknut is installed.
32. Install lockwasher (24B) on the shaft protruding through
the bearing in the head with the tangs outward. Ensure
the inner tang “A” of the lockwasher is engaged in the
slot in shaft threads. Bend it slightly, if necessary. (See
Figure 8.)
33. Install locknut (24A) onto threads of shaft with the
tapered end inward.
34. Using a keyed coupling half, hold the shaft end and
tighten the locknut with a spanner wrench to pull the
head against the cylinder. DO NOT overtighten and
shear the inner tang of the lockwasher.
35. Uniformly tighten the head capscrews, torquing to 25
lbs ft (34 Nm).
36. Loosen both bearing locknuts (24A).
37. Rotate the shaft to test for binding or tight spots. If the
rotor does not turn freely, tap the rim of the head with a
soft faced mallet until the correct position is found.
LOCKNUT ADJUSTMENT
It is important that the bearing locknuts (24A) and
lockwashers (24B) be installed and adjusted properly.
Overtightening locknuts can cause bearing failure or a
broken lockwasher tang. Loose locknuts will allow the rotor
to shift against the discs (71), causing wear. See Figure 8.
Figure 8– Locknut Assembly
38. On both ends of the pump shaft, install a lockwasher
(24B) with the tangs facing outward, followed by a
locknut (24A) with the tapered end inward. Ensure the
inner tang "A" of the lockwasher is located in the slot in
the shaft threads, bending it slightly, if necessary.
39. Tighten both locknuts (24B) to ensure that the bearings
(24) are bottomed in the head recess. DO NOT
overtighten and bend or shear the lockwasher inner
tang.
40. Loosen both locknuts (24A) one complete turn.
41. Tighten one locknut (24A) until a slight rotor drag is felt
when turning the shaft by hand.
42. Back off the nut the width of one lockwasher tang "B".
Secure the nut by bending the closest aligned lockwasher
tang into the slot in the locknut. The pump should turn
freely when rotated by hand.
43. Tighten the opposite locknut (24A) by hand until it is snug
against the bearing (24). Then, using a spanner wrench,
tighten the nut the width of one lockwasher tang “B”.
Tighten just past the desired tang, then back off the nut to
align the tang with the locknut slot. Secure the nut by
bending the aligned lockwasher tang into the slot in the
locknut. The pump should continue to turn freely when
rotated by hand.
44. To check adjustment, grasp the nut and washer with
fingers and rotate back and forth. If this cannot be done,
one or both locknuts are too tight and should be alternately
loosened one stop at a time (.001" - 25 microns). Begin by
loosening the locknut (24A) adjusted last.
45. Attach the new bearing cover gasket (26) and the bearing
cover (27) to the non-driven side of pump with the grease
fitting (76) upward. Install and tighten the bearing cover
capscrews (28), torquing to 15 lbs ft (20 Nm).
46. Inspect the grease seal (104) in the foot bracket for wear
or damage and replace as required. Grease the outside
diameter of the grease seal (104) and push it into the
bracket (108 or 108B) with the lip inward.
47. Mount the assembled pump on the foot bracket (108 or
108B) with the four mounting screws (28A).
48. Reinstall coupling, shaft key, and coupling guards.
49. Refer to “Pre-Start Up Check List” and “Start Up
Procedures” sections of this manual prior to restarting
pump operation.

501-A00 Page 10/12
MAINTENANCE:
RELIEF VALVE ASSEMBLY
1. Insert the valve (9) into the relief valve bore of the casing
with the small end inward.
2. Install relief valve disc (9A) into relief valve.
3. Install the relief valve spring (8) in the valve bore.
4. Install new O-ring (4A) on spring guide (7).
5. Install spring guide (7) in valve bore of cylinder, aligning
spring (8) on spring guide during assembly.
6. Install new O-ring (10) in O-ring groove in relief valve cap
(4).
7. Apply a thin coat of grease on threads of relief valve cap
(4) and install in cylinder (12).
8. Screw the relief valve adjusting screw (2) with locknut (3)
into the valve cover (4) until it makes contact with the
spring guide (7).
9. After the relief valve has been adjusted, tighten the
Locknut (3) 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"
10. Refer to “Pre-Start Up Check List” and “Start Up
Procedures” sections of this manual prior to restarting
pump operation.
Operation without guards in place can
cause serious personal injury, major
property damage, or death.
Do not operate
without guard
in place
Failure to adjust guards covering all
rotating part, allowing only a safe gap,
can cause personal injury or death
Do not operate
without guard
in place

501-A00 Page 11/12
PUMP TROUBLESHOOTING
NOTICE:
Maintenance shall be performed by qualified technicians only,
following the appropriate procedures and warnings as presented in this manual.
SYMPTOM PROBABLE CAUSE
Pump Not Priming 1. Pump not wetted.
2. Worn vanes.
3. Internal control valve closed.
4. Strainer clogged.
5. Inlet line or valves clogged or too restrictive.
6. Pump vapor-locked.
7. Pump speed too low for priming.
8. Relief valve partially open, worn or not seating properly.
Reduced Capacity 1. Pump speed too low.
2. Internal control valve not fully open.
3. Excessive restriction in the inlet line (i.e.: undersized piping, too many elbows &
fittings, clogged strainer, etc.).
4. Damaged or worn parts (vanes, cylinder, or rotor).
5. Excessive restriction in discharge line causing partial flow through the relief valve.
6. Relief Valve worn, set too low, or not seating properly.
7. External Bypass Valve set too low.
8. Operating without a vapor return line.
9. Vanes installed incorrectly (see "Vane Replacement").
Noise 1. Excessive pressure drop on the pump due to:
a. Undersized or restricted fittings in the inlet line.
b. Pump speed too fast.
c. Pump too far from fluid source.
2. Running the pump for extended periods with a closed discharge line.
3. Pump not securely mounted.
4. Misalignment of pump, or motor - base mounted pumps.
5. Bearings worn or damaged.
6. Vibration from improperly anchored piping.
7. Bent shaft, or drive coupling misaligned.
8. Excessively worn rotor.
9. Malfunctioning valve in the system.
10. Relief valve setting too low.
11. Damaged vanes (see following category).
Damaged Vanes 1. Foreign objects entering the pump.
2. Running the pump dry for extended periods of time.
3. Cavitation.
4. Excessive heat.
5. Hydraulic hammer - pressure spikes.
6. Vanes installed incorrectly (see "Vane Replacement").
7. Incompatibility with the liquids pumped.
Broken Shaft 1. Foreign objects entering the pump.
2. Relief valve not opening.
3. Hydraulic hammer - pressure spikes.
4. Pump/driver shaft misalignment.
5. Excessively worn vanes or vane slots.
Mechanical Seal Leakage 1. O-rings not compatible with the liquids pumped.
2. O-rings nicked, cut or twisted.
3. Shaft at seal area damaged, worn or dirty.
4. Ball bearings overgreased.
5. Excessive cavitation.
6. Mechanical seal faces cracked, scratched, pitted or dirty.
Overload on Motor 1. Motor Horsepower not sufficient for application.
2. Improper wiring and/or low voltage to motor.
3. Misalignment
4. Excessive pressure or speed.
5. Bearing locknuts adjusted improperly.
6. Faulty or worn bearings.
7. Rotor rubbing against head or cylinder.
8. Dirty mechanical seal faces.

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