BLACKMER STX3 Manual

BLACKMER TRUCK PUMPS
961823
INSTRUCTIONS NO. 203-A00
INSTALLATION OPERATION AND MAINTENANCE INSTRUCTIONS
MODELS: STX3, STX2A, STX1220A,
STX3-DEF, STX2A-DEF, STX1220A-DEF
Section
Effective
Replaces
203
Mar 2012
May 2011
STX3 STX2A, STX1220A
STX3-DEF STX2A-DEF, STX1220A-DEF
TABLE OF CONTENTS Page
PUMP DATA
Technical Data.................................................... 2
Initial Pump Start Up Information........................ 2
INSTALLATION
Pre-Installation Cleaning..................................... 3
Location and Piping............................................ 3
Truck Mounting................................................... 3
Pump Drive......................................................... 3
Hydraulic Drive ................................................... 4
Pump Rotation.................................................... 4
To Change Pump Rotation................................. 4
OPERATION
Pre-Start Up Check List...................................... 4
Start Up Procedures........................................... 4
Pump Speed....................................................... 5
Reverse Rotation................................................ 5
Flushing the Pump.............................................. 5
Pump Relief Valve.............................................. 5
Relief Valve Setting and Adjustment .................. 5
MAINTENANCE
Strainers ............................................................. 6
Lubrication.......................................................... 6
Vane Replacement............................................. 6
Pump Disassembly............................................. 7
Pump Assembly.................................................. 7
TROUBLE SHOOTING..................................... 9
NOTE: Numbers in parentheses following individual parts
indicate reference numbers on Blackmer Parts List No.
203-A01, 203-A03 and 203-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 Truck 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 truck 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.

203-A00 page 2/12
SAFETY DATA
Failure to set the vehicle emergency
brake and chock wheels before
performing service can cause severe
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
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.
If pumping hazardous or toxic fluids,
system must be flushed prior to
performing service
Hazardous pressure
can cause personal
injury or property
damage
Hazardous or toxic
fluids can cause
serious injury.
Failure to disconnect and lockout
electrical power or engine drive before
attempting maintenance can cause
severe personal injury or death
Operation without guards in place can
cause serious personal injury, major
property damage, or death.
Hazardous
machinery can
cause serious
personal 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
STX2A
STX2A-DEF STX1220A STX1220A-DEF STX3 STX3-DEF
Maximum Pump
Speed 780 rpm 1,200 rpm 800 RPM
Max. Operating
Temperature 240°F (115°C) 240°F (115°C) 240°F
(115°C)
Maximum
Viscosity 4,600 SSU (990 cSt) 100 SSU (22 cSt) 20,000 SSU (4,250 cSt)
Maximum
Differential
Pressure
125 psi
(8.6 Bar) 125 psi (8.6 Bar) 125 psi (8.6 Bar)
Maximum
Working Pressure 175 psi (12.1 Bar) 175 psi (12.1 Bar) 175 psi (12.1 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.:
ID No.
Serial No.:
Date of Installation:
Inlet Gauge Reading:
Discharge Gauge Reading:
Flow Rate:

203-A00 page 3/12
INSTALLATION
NOTICE:
Blackmer truck 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.
PRE-INSTALLATION CLEANING
NOTICE:
New pumps contain residual test fluid and rust inhibitor.
If necessary, flush pump prior to use.
STX3-DEF, STX2A-DEF & STX1220A-DEF models require
special cleaning and testing. Consult factory if not
familiar with these procedures.
Foreign matter entering the pump WILL cause extensive
damage. The supply tank and piping MUST be cleaned and
flushed prior to pump installation and operation.
LOCATION AND PIPING
An improperly designed piping system or unit installation
WILL significantly reduce pump performance and life. The
following are piping system guidelines for pump installation.
1. To minimize intake losses, locate the pump as close as
possible to the source of supply.
2. Piping MUST be properly supported to prevent any piping
loads from being placed on the pump.
3. Intake piping and fittings MUST be at least as large in
diameter as the pump intake connection.
4. Minimize the number of intake line fittings (valves, elbows,
etc.) and piping turns or bends.
5. Install vacuum and pressure gauges in the ports located
on the pump cylinder near the intake and discharge
flanges to check pump at start-up. (STX3 has ¼” BSPP
ports, STX2 and STX1220 have ¼” NPT ports)
6. Install a strainer in the inlet line to protect the pump from
foreign matter. Place the intake strainer to allow frequent
cleaning.
7. Intake and discharge piping MUST be free of all leaks.
TRUCK MOUNTING
The pump will operate satisfactorily in any position. Consult
Blackmer factory for vertical shaft mounts. The pump can be
bolted to the truck frame or on a saddle hung below the
frame, and MUST be adequately supported. Mounting the
pump with the cylinder bottom down, or with the intake port
up, is recommended for thorough draining of the pump.
The bracket mount (32) on the 3” size pump allows even
more mounting flexibility.
PUMP DRIVE
The pump may be driven by a power take-off through
universal joints. When using universal joints, a splined slip
joint, properly lubricated, must be used on the connecting
jackshaft to prevent end thrust on the pump shaft.
It is very important to install a proper drive line to avoid
excessive wear, vibration and noise. See Fig. 2 and Table 1.
A drive shaft guard between the pto and
pump must be provided to prevent
personal injury, property damage, or
death.
Do not operate
without guard
in place
Note: A Drive Shaft Guard between the pump and the PTO
MUST be provided. (Not Shown)
Figure 2 Pump Drive
Angle of Drive Shaft
1º through 5º 6º through 10º 11º through 15º
Very Good Good Fair
Table 1
General guidelines to follow for proper pump drive:
1. DO NOT use Square slip joints.
2. Use the least number of jackshafts as is practical.
3. Use an even number of universal joints.
4. The pump shaft and power take-off shaft must be parallel
in all respects. Use an angular level measuring device to
ensure the PTO and pump shaft are parallel to each
other. If necessary, the pump can be shimmed to correct
any misalignment. The PTO shaft coming off at the
transmission does not need to be perfectly horizontal as
long as the pump is shimmed to have its shaft parallel in
all respects to the PTO shaft.
5. The yokes of the universals at both ends of the jackshaft
must be parallel and in phase.
6. The maximum angle between the jackshaft and the pump
shaft is 15 degrees. Refer to Table 1.
Failure to follow any of these guidelines may result in a gallop
or uneven turning of the pump rotor, which will in turn cause a
surging vibration to the liquid stream and piping system.
Contact the supplier of the drive line components for specific
design assistance.

203-A00 page 4/12
INSTALLATION
HYDRAULIC DRIVE
The pump may also be driven hydraulically. Hydraulic motors
need to be well supported with their shafts parallel to the
pump shaft in all respects. Blackmer provides an optional
close-coupled hydraulic motor adapter. The adapter provides
for straight alignment of a hydraulic motor drive through a
solid coupling connected to the pump shaft. This coupling
connection requires grease lubrication every three months at
minimum. Refer to the "Lubrication" section of this manual.
Figure 3 Hydraulic Drive
NOTICE:
Confirm correct pump rotation by checking the pump
rotation arrows respective to pump driver rotation.
TO CHANGE PUMP ROTATION
The STX Series pumps are equipped with a double ended
rotor and shaft, enabling them to be driven from either shaft
end. To change rotation, rotate the pump 180 degrees so that
the opposite shaft becomes the driven shaft. The shaft
protector (186) MUST be mounted over the non-driven shaft
end.
Operation without shaft protector can
cause serious personal injury, major
property damage, or death.
Do not operate
without guard
in place
OPERATION
Pumps operating against a closed
valve can cause system failure,
personal injury and property damage
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
If pumping hazardous or toxic fluids,
system must be flushed prior to
performing service
Hazardous or toxic
fluids can cause
serious injury.
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
PRE-START UP CHECK LIST
1. Check the alignment of the pipes to the pump. Pipes must
be supported so that they do not spring away or drop
down when the pump flanges or union joints are
disconnected.
2. Install vacuum and pressure gauges in the ¼" BSPP/NPT
ports located on the pump cylinder near the intake and
discharge flanges. These can be used to check the actual
suction and discharge conditions after pump start-up.
3. Inspect complete piping system to ensure that no piping
loads are being placed on the pump.
4. Secure appropriate hose connections.
START UP PROCEDURES
NOTICE:
Consult the "General Pump Troubleshooting" section of
this manual if difficulties during start up are experienced.
1. Ensure that appropriate valves are open in the inlet and
discharge lines.
2. Start the pump. Priming should occur within one minute.
3. Check the vacuum and pressure gauges to ensure the
system is operating within expected parameters. Record
the gauge readings in the "Initial Start Up Information"
section of this manual for future reference.
4. Inspect piping, fittings, and associated system equipment
for leaks, noise, vibration and overheating.

203-A00 page 5/12
OPERATION
START UP PROCEDURES (cont….)
5. Check the flow rate to ensure the pump is operating within
the expected parameters.
6. Check the pressure setting of the relief valve by
momentarily closing a valve in the discharge line and
reading the pressure gauge. This pressure needs to be 15
-20 psi (1.0 - 1.4 Bar) higher than the maximum system
operating pressure or the external bypass valve setting (if
equipped). DO NOT operate the pump against a closed
discharge valve for more than 15 seconds. If
adjustments need to be made, refer to the "Relief Valve
Setting and Adjustment" section of this manual.
PUMP SPEED
PTO and hydraulically driven units MUST contain speed
control devices to prevent pump speeds above the maximum
RPM specifications, regardless of the truck engine unloading
speeds. If fluid delivery is less than expected, see the
"General Pump Troubleshooting" section
REVERSE ROTATION
NOTICE:
When pumps are operated in reverse a separate pressure
relief valve must be 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. When operating the pump in reverse, a
separate bypass valve MUST be installed to protect the pump
from excessive pressure.
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, non-lubricating fluid is used, it must be
flushed from the pump immediately.
To flush the pump, use the following procedure:
1. Allow the pump to evacuate as much fluid as possible.
2. Run cleaning fluid through the pump intake. The cleaning
fluid must be compatible with the pump O-rings and vane
material. When handling "sticky" fluids that solidify within
the pump (i.e., waxes, adhesives, resins, asphalts, etc.),
use a fluid that will prevent solidification of the fluid being
transferred and facilitate flushing.
3. Operate the pump against a closed discharge for 15
seconds to allow the cleaning fluid to recirculate through
the internal relief valve.
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.
RELIEF VALVE
NOTICE:
The pump internal relief valve is designed to protect the
pump from excessive pressure and must not be used as
a system pressure control valve.
Pumping volatile liquids under suction lift may cause
cavitation. DO NOT partially close the discharge valve. This
WILL result in internal relief valve chatter. For these
applications, install an external bypass valve, and any
necessary piping, back to the storage tank. Use a bypass
system when operating for extended periods (more than 1
minute) against a closed discharge valve.
Failure to disengage pto before
adjusting pump relief valve can cause
severe personal injury or death
Hazardous Machinery
can cause severe
personal injury or death
Incorrect settings of the pressure
relief valve can cause pump
component failure, personal injury,
and property damage.
Hazardous pressure can
cause personal injury or
property damage
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 15 - 20 psi (1.0 - 1.4 Bar) higher than the
operating pressure, or the external bypass valve setting (if
equipped).
Relief valve cap is exposed to pumpage
and will contain some fluid
Hazardous or toxic
fluids can cause
serious injury.
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 and turn the adjusting screw inward, or
clockwise. Replace the valve cap.
2. To DECREASE the pressure setting, remove the relief
valve cap 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.

203-A00 page 6/12
MAINTENANCE
Failure to set the vehicle emergency
brake and chock wheels before
performing service can cause severe
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
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.
If pumping hazardous or toxic fluids,
system must be flushed prior to
performing service
Hazardous pressure
can cause personal
injury or property
damage
Hazardous or toxic
fluids can cause
serious injury.
Failure to disconnect and lockout
electrical power or engine drive before
attempting maintenance can cause
severe personal injury or death
Operation without guards in place can
cause serious personal injury, major
property damage, or death.
Hazardous
machinery can
cause serious
personal injury.
Do not operate
without guard
in place
NOTICE:
Maintenance shall be performed by qualified technicians
only, following the appropriate procedures and warnings
as presented in this manual.
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, hydraulic adapter coupling or
any other parts while the pump is running.
Lubricate the ball bearings, and hydraulic motor couplings (if
equipped), every three months at a minimum
Recommended Grease:
Mobil® - Mobilgrease XHP222,
Exxon® - RONNEX MP Grease,
or equivalent.
Greasing Procedure:
1. Remove the grease relief fittings (76A) from the bearing
covers (27A) or hydraulic motor adapter (135).
2. 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 over grease 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.
VANE REPLACEMENT
NOTICE:
Maintenance shall be performed by qualified technicians
only, following the appropriate procedures and warnings
as presented in manual.
1. Remove the head assembly from the outboard (non-
driven) side of the pump according to steps 2 - 6 in the
"Pump Disassembly" section of this manual.
2. Turn the shaft by hand until a vane comes to the top (12
o'clock) position of the rotor. Remove the vane.
3. Install a new vane, ensuring that the rounded edge is UP,
and the relief grooves are facing towards the direction of
rotation. See Figure 4.
4. Repeat steps 2 and 3 until all vanes have been replaced.
5. Reassemble the pump according to steps 2 - 7 and 12 -
17 of the "Pump Assembly." section of this manual.
Figure 4
(3” shown; 2” pumps have 4 vanes.)

203-A00 page 7/12
MAINTENANCE
PUMP DISASSEMBLY
NOTICE:
Follow all hazard warnings and instructions provided in
the “Maintenance” section of this manual.
1. Starting on the inboard (driven) end of the pump, clean
the pump shaft thoroughly, making sure the shaft is free of
nicks and burrs. This will prevent damage to the
mechanical seal when the inboard head assembly is
removed.
2. Remove the inboard bearing cover capscrews (28) and
slide the inboard bearing cover (27A) and gasket (26) off
the shaft. Discard the bearing cover gasket.
3. Remove the outboard bearing cover capscrews (28) and
slide the outboard bearing cover (27A) and gasket (26) off
the shaft. Discard the bearing cover gasket.
4. To remove the locknuts and lockwashers (24A and 24B):
a. Bend up the engaged lockwasher tang and loosen the
set screw (24C) in the lock nut.
b. Rotate the locknut (24A) counterclockwise to remove it
from the shaft.
c. Slide the lockwasher (24B) off the shaft. Inspect the
lockwasher for damage and replace as required.
d. Repeat steps a, b and c on the opposite shaft end.
5. Remove the head capscrews (21) and carefully pry the
head (20) away from the cylinder. Jack screw holes are
provided on the STX3 if needed.
6. 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.
a. Pull the bearing (24) from the housing in the head.
b. To remove the mechanical seal (153), use two screw
drivers to gently push the backside of the seal jacket
to push the seal from the head (see Figure 6). Use
care when placing the screwdrivers to prevent
damage to the seal faces. Remove and discard
mechanical seal O-rings.
Figure 6
7. 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) and push
rods (77) from falling out. Carefully set the rotor and
shaft, vanes and push rods aside for future vane
replacement and reassembly. (STX1220 models do not
use pushrods.)
8. Remove the remaining components from the outboard
side of the pump, as instructed in steps 5 and 6 above.
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. Reassemble the OUTBOARD side of the pump first:
2. Install a new head O-ring (72) in the groove in the head.
Note: For ease of installation, soak the head O-ring in
200°F (93°C) water.
3. Install the head (20) on the outboard side of the cylinder.
Install and uniformly tighten four head capscrews (21) 90°
apart; torque to 25 lbs. ft (34 Nm).
4. MECHANICAL SEAL
Apply a small amount of motor oil in the head recess.
Push the mechanical seal assembly (153) into the recess
of the head with seal jacket drive tangs inward. The pin in
the stationary seat must be between the lugs in the back
of the head recess.
5. Hand pack the ball bearing (24) with grease. Refer to the
"Lubrication" section for the recommended grease.
6. Install the bearing into the head recess. The bearing balls
should face outward, with the grease shield inward.
Ensure the bearing is fully and squarely seated against
the mechanical seal. Install two 3/8" (10 mm) washers
and two bearing cover capscrews (28) to clamp the
bearing for proper bearing locknut adjustment (see Figure
7). The washers and capscrews will be removed after the
locknuts are adjusted. Leave the two capscrews and
washer in place to retain the bearing during assembly.
Figure 7 Clamping the Bearing
7. Turn the pump cylinder around and begin assembly on
the opposite, inboard end.
8. Inspect the vanes (14) and push rods (77) for wear and
damage, and replace as follows:
a. Partially install the non-driven end of the rotor and
shaft (13) into the open side of the pump cylinder.
b. Leave part of the rotor outside of the cylinder so that
the bottom vanes can be installed and held in place as
the push rods are installed in the push rod holes of the
rotor. Insert the new vanes into the rotor slots with the
rounded edges outward, and the vane relief grooves
facing TOWARDS the direction of rotation. See Fig. 4.
c. After the bottom vanes and push rods are installed,
insert the rotor and shaft fully into the cylinder.
(STX1220 models do not use pushrods.)
d. Install the remaining vanes into the top positions of the
rotor. Rotate the shaft by hand to engage the drive
tangs of the seal jacket in the rotor slots.

203-A00 page 8/12
MAINTENANCE
9. Install the inboard head, mechanical seal and bearing as
instructed in steps 2 through 6. Apply a thin coating of
motor oil on the inboard shaft to aid installation.
10. Rotate the shaft by hand to engage the mechanical seal
drive tangs and to test for binding or tight spots. If the
rotor does not turn freely, lightly tap the rims of the heads
with a soft faced mallet until the correct position is found.
Install all of the remaining head capscrews for each head
and uniformly torque to 25 lbs. ft (34 Nm).
11. LOCKNUT INSTALLATION
The bearing locknuts (24A) and lockwashers (24B) MUST
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 heads, causing wear. See Figure 10.
a. 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.
b. Tighten both locknuts to ensure that the bearings are
bottomed in the head recess. DO NOT overtighten
and bend or shear the lockwasher inner tang.
c. Loosen both locknuts one complete turn.
d. Tighten one locknut until a slight rotor drag is felt when
turning the shaft by hand.
e. 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.
f. Tighten the opposite locknut by hand until it is snug
against the bearing. Then, using a spanner wrench,
tighten the nut the width of one lockwasher tang.
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.
g. 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"). Begin
by loosening the locknut adjusted last.
h. After adjustment is complete, tighten the locknut set
screws (24C) securely. Remove the bearing cover
capscrews and 3/8" washers from both ends of the
pump.
Figure 10 Locknut Adjustment
12. Inspect the grease seal (104) for wear or damage and
replace as required. Grease the outside diameter of the
grease seal and push it into the bearing cover (27A) with
the lip of the seal inward. The lip will face outward when
the bearing cover is installed on the head
13. Attach a new bearing cover gasket (26) and the bearing
cover to the head. Install and torque the bearing cover
capscrews (28) to 15 lbs. ft (20 Nm).
14. Follow steps 12 and 13 to install the grease seal and
bearing cover (27A) on the opposite side of the pump.
15. Attach the shaft protector (186) on the non-driven shaft
end.
Operation without shaft protector can
cause serious personal injury, major
property damage, or death.
Do not operate
without guard in
place.
16. RELIEF VALVE ASSEMBLY
a. Insert the valve (9) into the relief valve bore of the
cylinder 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 O-ring (10) and the valve
cover (4) on the cylinder.
d. Screw the relief valve adjusting screw (2) into the
valve cover until it makes contact with the spring guide
(7). 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"
e. Install the relief valve cap (1) and gasket (88) after the
relief valve has been precisely adjusted.

203-A00 page 9/12
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. Suction valve closed.
4. Air leaks in the suction line.
5. Strainer clogged.
6. Suction line or valves clogged or too restrictive.
7. Broken drive train.
8. Pump vapor-locked.
9. Pump speed too low for priming.
10. Relief valve partially open, worn or not seating properly.
11. Vanes installed incorrectly (see "Vane Replacement").
Reduced Capacity
1. Pump speed too low.
2. Suction valves not fully open.
3. Air leaks in the suction line.
4. Excessive restriction in the suction line (i.e.: undersized piping, too many elbows &
fittings, clogged strainer, etc.).
5. Damaged or worn parts.
6. Excessive restriction in discharge line causing partial flow through the relief valve.
7. Relief Valve worn, set too low, or not seating properly.
8. Vanes installed incorrectly (see "Vane Replacement").
Noise
1. Excessive vacuum on the pump due to:
a. Undersized or restricted fittings in the suction line.
b. Pump speed too fast for the viscosity or volatility of the liquid.
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. Improper drive line (see "Pump Drive").
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. Viscosity too high for the vanes and /or the pump speed.
5. Incompatibility with the liquids pumped.
6. Excessive heat.
7. Worn or bent push rods, or worn push rod holes.
8. Settled or solidified material in the pump at start-up.
9. Hydraulic hammer - pressure spikes.
10. Vanes installed incorrectly (see"Vane Replacement").
Broken Shaft
1. Foreign objects entering the pump.
2. Viscosity too high for the pump speed.
3. Relief valve not opening.
4. Hydraulic hammer - pressure spikes.
5. Pump/driver misalignment.
6. Excessively worn vanes or vane slots.
7. Settled or solidified material in the pump at start-up.
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 over greased.
5. Excessive cavitation.
6. Mechanical seal faces cracked, scratched, pitted or dirty.

203-A00 page 10/12
NOTES

203-A00 page 11/12
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]