Operation and Maintenance Guide
DP 75,
Models covered
DP75ALB-BR 3" Bolted (Al/Bun)
DP75ALN-BR 3" Bolted (Al/Neo)
DP75ALV-BR 3" Bolted (Al/Vit)
DP75ALS-BR 3" Bolted (Al/San)
DP75ALH-BR 3" Bolted (Al/Hyt)
DP75ALT-BR 3" Bolted (Al/PTF)
Read this manual carefully before installing, operating or servicing this equipment. It’s the responsibility of the
this manual is read by the operator. Please preserve this manual
This document issued with Model Number
Product Sr No.
& are trademarks of Teryair Equipment Pvt. Ltd.
Operation and Maintenance Guide
, 3" Diaphragm Pump Series
(Al/Bun)-NPT DP75ALB-BG 3" Bolted
(Al/Neo) -NPT DP75ALN-BG 3" Bolted
(Al/Vit)-NPT DP75ALV-BG 3" Bolted
(Al/San)-NPT DP75ALS-BG 3" Bolted
(Al/Hyt)-NPT DP75ALH-BG 3" Bolted
(Al/PTF)-NPT DP75ALT-BG 3" Bolted
Read this manual carefully before installing, operating or servicing this equipment. It’s the responsibility of the
operator. Please preserve this manual.
are trademarks of Teryair Equipment Pvt. Ltd.
Operation and Maintenance Guide
Bolted (Al/Bun)-BSPT
Bolted (Al/Neo)-BSPT
Bolted (Al/Vit)-BSPT
Bolted (Al/San)-BSPT
Bolted (Al/Hyt)-BSPT
Bolted (Al/PTF)-BSPT
Read this manual carefully before installing, operating or servicing this equipment. It’s the responsibility of the employer to ensure
Pump Nomenclature
Note:-Viton®, Santoprene®, Hytrel® are registered trademark
Pump Data
Pump Data A
Model No Wetted Material
Diaphragm Material
Ball Material
DP75ALB-BR/G
Aluminium Buna N
DP75ALN-BR/G
Aluminium Neoprene Neoprene
DP75ALV-BR/G
Aluminium Viton
DP75ALS-BR/G
Aluminium Santoprene Santoprene
DP75ALH-BR/G
Aluminium Hytrel
DP75ALT-BR/G
Aluminium PTFE
Note:- Delivery figures are at 120 PSI air supply pressure.
Viton®, Santoprene®, Hytrel® are registered trademarks of Dupont Dow Elastomers.
Ball Material Seat
Material O-ring
Material Suction Capacity
Max. Delivery
Buna N Buna N N.A. 5.8mtrs 840
liters/min
Neoprene Neoprene N.A. 5.8mtrs 840
liters/min
Viton Viton N.A. 5.8mtrs 840
liters/min
Santoprene Santoprene N.A. 5.8mtrs 840
liters/min
Hytrel Hytrel N.A. 5.8mtrs 840
liters/min
PTFE Aluminium PTFE 3.5 mtrs 640
liters/min
gures are at 120 PSI air supply pressure. Normal operating supply pressure is 90 PSI.
FF-MM-294-REV - 00
1
Max. Delivery
Air Consumption
Weight
840 liters/min
100 C.F.M. 54 Kg
840 liters/min
100 C.F.M. 54 Kg
840 liters/min
100 C.F.M. 54 Kg
840 liters/min
100 C.F.M. 54 Kg
840 liters/min
100 C.F.M. 54 Kg
640 liters/min
100 C.F.M. 54 Kg
operating supply pressure is 90 PSI.
Pump Data B (Common between all variants)
Operating and Safety Precautions
Warning. Static Electricity Static sparks can cause explosion resulting in
severe injury or death.
Ground the pump and the pump connections like
hoses and containers into which or from the fluid is
being transferred. Connect the grounding wire to
any bolt on the pump.
Check continuity of electrical path to ground at
regular intervals.
Consult local building and electrical codes for
grounding requirements where needed.
Use hoses containing a grounding wire.
Warning: Pump Exhaust In case of a diaphragm failure, fluid being pumped
may spray out from the exhaust of the pump. This
may cause severe injury depending on the fluid
being pumped.
If the fluid is hazardous, pipe away the exhaust to a
safe remote location using a generous diameter ¾”
pipe preferably with a grounding arrangement, and
refit the muffler at the end of this arrangement.
Always wear safety glasses while in the vicinity of
an operating pump.
Warning: Overpressure/Hazardous
Pressure Do not exceed the max supply air pressure of 125
PSI.
Make sure all connected hoses and pipelines are
rated to operate safely with the pressures generated
by pump of 125 PSI.
Do not open or handle pump or hoses while
pressurized.
Disconnect air supply line and relieve pressure from
the system by carefully opening
supply lines.
Description Value
Non wetted part Aluminium
Air inlet detail ¾'' NPT/BSPT
Air Outlet detail 1'' NPT
Fluid Inlet 3" NPT/BSPT
Fluid Outlet 3" NPT/BSPT
Pump Data B (Common between all variants)
Operating and Safety Precautions
Static sparks can cause explosion resulting in
Ground the pump and the pump connections like
which or from the fluid is
being transferred. Connect the grounding wire to
Check continuity of electrical path to ground at
Consult local building and electrical codes for
grounding requirements where needed.
wire.
In case of a diaphragm failure, fluid being pumped
may spray out from the exhaust of the pump. This
may cause severe injury depending on the fluid
the exhaust to a
safe remote location using a generous diameter ¾”
pipe preferably with a grounding arrangement, and
refit the muffler at the end of this arrangement.
Always wear safety glasses while in the vicinity of
ssure/Hazardous
Do not exceed the max supply air pressure of 125
Make sure all connected hoses and pipelines are
rated to operate safely with the pressures generated
Do not open or handle pump or hoses while
isconnect air supply line and relieve pressure from
discharge and
Caution: Chemical compatibilityPlease check that the fluid being pumped is
compatible with the wetted parts of the pump. Refer
Cole Parmer
(http://www.coleparmer.in/Chemical
guide for details. Note that chemical compatibility
may change with temperature;
while selecting pump material
Caution: Structural supportPlease refer figure 1 and ensure that the piping
system is independently supported and does not
load the pump. The pump is
the continuous and often pulsating load of a piping
system. Important to use a flexible connection
between rigid piping and pump casi
Caution: Running dry, disconnection of
hoses when not in use for Although these pumps can be run dry for long
periods, it is advisable to avoid this as it causes
unnecessary wear of wearing parts.
Caution: Tightening torques and tim
re checking Outer flange to Shaft 88Nm
Inlet & Outlet 41Nm
Outer chamber 41Nm
Air Valve Body to Housing 11
FF-MM-294-REV - 00
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Chemical compatibility Please check that the fluid being pumped is
compatible with the wetted parts of the pump. Refer
compatibility
http://www.coleparmer.in/Chemical-Resistance)
guide for details. Note that chemical compatibility
temperature; take this into account
while selecting pump material.
Structural support and ensure that the piping
system is independently supported and does not
pump is not designed to take
the continuous and often pulsating load of a piping
system. Important to use a flexible connection
between rigid piping and pump casings.
Running dry, disconnection of
hoses when not in use for long periods. Although these pumps can be run dry for long
periods, it is advisable to avoid this as it causes
unnecessary wear of wearing parts.
torques and timely
Nm
Body to Housing 11Nm
Warning: Hazardous Materials Do not move a pump that contains hazardous fluids
trapped inside it. Please observe prescribed
handling and safety codes. Drain the pump safely,
by turning it upside down and collecting the fluid
safely, before moving the pump.
Warning: Explosion Please check compatibility of fluids intended to be
handled with the materials of construction of the
pump. Severe reactions and explosions may occur
if materials are incompatible.
Caution:Temperature limitations
Elastomer Minimum allowable
temperature
Neoprene 0° F +18°C
Buna N +10° F -12°C
Viton® -40° F -40°C
PTFE +40° F +4°C
Santoprene® -40° F -40°C
Hytrel® -20° F -29°C
Suggested Lubricants
Above 27 deg C
(80 deg F) deg C (40 degF to
Shell Toona R 72 Toona R 41
Mobil Almo 529 Almo 527
Esso -- -- -- Arox EP 65
Caltex Rando Oil 150 Rando Oil 100
Texaco Regal Oil F Regal Oil PE
Daltron Silkolene 881 Silkolene 548Burmah Castrol RD Oil 3 RD Oil Light
BP RD 220 HP60C RD150 HP20C
Duckham Garnet 7 Garnet 6
Sternol Merlin 87 Merlin 71
Petrofina Purifoc 53 Purifoc 46
Chevron Vistac Oil 18X Vistac Oil 19X
Do not move a pump that contains hazardous fluids
trapped inside it. Please observe prescribed
safety codes. Drain the pump safely,
by turning it upside down and collecting the fluid
Please check compatibility of fluids intended to be
handled with the materials of construction of the
reactions and explosions may occur
Caution: Operator understandingPlease ensure that all operators have read this
manual and have the required understanding
safe working practices and are equipped with safety
equipment when working on/around the pump.
Caution: Using genuine Teryair parts and
fitting as instructed Use genuine Teryair parts to ensure correct pump
operation and maximize life
limitations
Minimum allowable temperature
Maximum allowable temperature
0° F
+200° F +93°C
+10° F
+180° F +82°C
40° F
+350° F +177°C
+40° F
+225° F +107°C
40° F
+225° F +107°C
20° F
+150° F +66°C
5 deg C to 27 deg C (40 degF to
80 degF)
Below 5 deg C
( 40 deg F)
Toona R 41 Toona R 27
Almo 527 Almo 525
Arox EP 65 Arox EP 45
Rando Oil 100 Rando Oil 46
Regal Oil PE Regal Oil B
Silkolene 548 Silkolene 773
RD Oil Light Megna SPX
RD150 HP20C RD80 HP10C
Garnet 6 Zero Flo 5
Merlin 71 Merlin 54
Purifoc 46 Purifoc 32
Vistac Oil 19X Vistac Oil 9X
FF-MM-294-REV - 00
3
Caution: Operator understanding Please ensure that all operators have read this
required understanding of
working practices and are equipped with safety
equipment when working on/around the pump.
Caution: Using genuine Teryair parts and
eryair parts to ensure correct pump
operation and maximize life
Intended use and Prohibitive useThese conditions are adequately described in operating and safety precautions. The list of chemical and fluids are too huge to list
here. Standard industry practice is to refer a accepted chemical compatibility guide such as Cole Parmeretc to establish
compatibility. See section caution: Chemical compatibility earlier in
Suggested site selection and Installation
recommendations
Location selection Pump location must be easily accessible with
reasonable space around for maintenance
operations.
Pump dimensional data for each variant is available
in section showing exploded views
Air supply Compressed air at 90 PSI (Stroke pumps can take a
max of 125PSI), free from moisture and having an
oil mist is essential. Use of a filter (50 microns), a
lubricator and a regulator is highly recommended
and should be installed as close as possible to the
pump inlet. Ensure correct grade of oil is used in
bowl. Too thick oil may slow down the valve shifting
mechanism and affect pump performance. See
suggested lubricants below.
Intended use and Prohibitive use adequately described in operating and safety precautions. The list of chemical and fluids are too huge to list
here. Standard industry practice is to refer a accepted chemical compatibility guide such as Cole Parmeretc to establish
caution: Chemical compatibility earlier in this document.
Suggested site selection and Installation
Figure 1
Pump location must be easily accessible with
reasonable space around for maintenance
Pump dimensional data for each variant is available
pumps can take a
max of 125PSI), free from moisture and having an
oil mist is essential. Use of a filter (50 microns), a
lubricator and a regulator is highly recommended
and should be installed as close as possible to the
of oil is used in the lubricator
may slow down the valve shifting
mechanism and affect pump performance. See
Suction Ensure that the suction head after installation is well
within the pumps suction capabilities
For DP 50 pumps fitted with Neoprene, Hytrel,
Viton, Buna N and Santoprene the suction head is
5.8 meters.
For DP 50 pumps fitted with PTFE the suct
is 5.4 meters.
Muffler Use of supplied muffler is recommended to bring
pump operation sounds down
in case of hazardous fluids handling, please read
section of safety regarding piping away of exhaust
see Warning: Pump Exhaust
manual.
FF-MM-294-REV - 00
4
adequately described in operating and safety precautions. The list of chemical and fluids are too huge to list
here. Standard industry practice is to refer a accepted chemical compatibility guide such as Cole Parmeretc to establish
Ensure that the suction head after installation is well
within the pumps suction capabilities
pumps fitted with Neoprene, Hytrel,
Viton, Buna N and Santoprene the suction head is
pumps fitted with PTFE the suction head
Use of supplied muffler is recommended to bring
pump operation sounds down to comfortable levels,
in case of hazardous fluids handling, please read
section of safety regarding piping away of exhaust
Warning: Pump Exhaust earlier in this
Piping See section on safety if used in hazardous area)
See Figure 1.
Suction side 3 inch or larger, non-collapsible
Delivery side 3 inch or larger.
A minimum number of bends and fittings to be used.
A flexible connection between suction, delivery and
air supply piping is highly recommended such that
piping stresses and loads do not transfer to pump
housing.
Select piping materials such that chemical
compatibility is maintained with the fluid being
pumped.
Operating InstructionsThe Teryair Stroke diaphragm pump generates a alternate stroking of the diaphragms against the fluid in the liquid chambers o
the Pump. This reciprocatory action is responsible for the
It is possible to control the output of the pump by controlling the supply air pressure.
It is also possible to control the output of the pump by throttling action on the fluid flowing in the outlet piping by means
if such a valve is shut completely the pressure in the discharge piping increases to a point when the pressure at pump discharge
equals it and the pump comes to a stop. This causes no damage to the pump and the pump consumes no more energy.
Upon opening of the valve, the pump starts reciprocating once again and resumes fluid delivery.
Troubleshooting
Sr. No Description
1 Pump stopped and will not start.
2 Pump runs slowly, poor delivery
ee section on safety if used in hazardous area)
collapsible
A minimum number of bends and fittings to be used.
A flexible connection between suction, delivery and
air supply piping is highly recommended such that
piping stresses and loads do not transfer to pump
Select piping materials such that chemical
compatibility is maintained with the fluid being
Operating Instructions The Teryair Stroke diaphragm pump generates a alternate stroking of the diaphragms against the fluid in the liquid chambers o
the Pump. This reciprocatory action is responsible for the fluid being pumped.
It is possible to control the output of the pump by controlling the supply air pressure.
It is also possible to control the output of the pump by throttling action on the fluid flowing in the outlet piping by means
such a valve is shut completely the pressure in the discharge piping increases to a point when the pressure at pump discharge
equals it and the pump comes to a stop. This causes no damage to the pump and the pump consumes no more energy.
e valve, the pump starts reciprocating once again and resumes fluid delivery.
Causes Remedial action
Pump stopped and will not start. Insufficient Air Pressure Check air pressure is as recommended at the pump air inlet
Air Filter Blocked Check if debris has clogged the inlet filter on the FRL unit/pump inlet air valve ( some models have air filter on the air inlet valve ) and ensure clear passage of air
Internal damage or excessive wear on components Proceed to dismantle the pump, examine component for wear, replace any worn components, re assemble carefully as instructed in this manual and re start the pump.
Pump runs slowly, poor delivery Cavitation Check if cavitation is occurring in the suction side, if sosuction vacuum by slowing down the pump.
Worn Balls and Seats Check proper sealing action of balls against seals, these components need to be replaced as a set if they are worn.
FF-MM-294-REV - 00
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The Teryair Stroke diaphragm pump generates a alternate stroking of the diaphragms against the fluid in the liquid chambers of
It is also possible to control the output of the pump by throttling action on the fluid flowing in the outlet piping by means of a valve.
such a valve is shut completely the pressure in the discharge piping increases to a point when the pressure at pump discharge
equals it and the pump comes to a stop. This causes no damage to the pump and the pump consumes no more energy.
Check air pressure is as recommended at the pump air inlet
Check if debris has clogged the inlet filter on the FRL unit/pump inlet air valve ( some models have air filter on the air inlet valve )
Internal damage or excessive wear on
dismantle the pump, examine component for wear, replace any worn components, re assemble carefully as instructed
Check if cavitation is occurring in the suction side, if so reduce suction vacuum by slowing down the pump.
Check proper sealing action of balls against seals, these components need to be replaced as a set if they are worn.
3 Pump air valve freezes
4 Air bubbles in pump discharge or Product spraying out of exhaust
Maintenance Regular inspection and maintenance schedules
working environment with little chance of breakdowns.
Follow the instructions clearly for disassembly and assembly of the pump and in the troubleshooting section.
Use genuine Teryair spares and if possible mention the serial number of the pump when ordering spares.
Always replace elastomers as a set, eg diaphragms, balls and seats
Disassembly and Re assemblyShut off air supply and allow residual Pressure to bleed off.
Disconnect air supply
Disconnect suction and discharge piping
Turn pump upside down allow process fluid to drain away. If fluid is hazardous due care should be taken.
Make a mark to indicate the positioning of each liquid chamber relative to the housing.
Insufficient or wrong lubricant in the air supply. Ensure that the lubricant is as per the recommended chart, a thicker lubricant often makes the air valve work sluggishly.
Internal damage or excessive wear on components Proceed to dismantle the pump, examine component for wear, replace any worn components, reassein this manual and re start the pump.
Excessive moisture in supply air line. Ensure that the dew point of the supplied air is low enough. Install an air dryer or moisture separator on the supply line.
Air bubbles in pump discharge or Product 1. Broken Diaphragm 2. Improper seal between inner
and shaft. 3. Air leakage into product from balls / seats area4. Air sucked into suction pipeline due to insufficiently
tight joints on suction pipeline.Proceed to dismantle the pump, examine component for wear, replace any worn components, re assembly carefully as instructed in this manual and re start the pump.
Regular inspection and maintenance schedules will greatly enhance the life of the pump and will ensure a trouble free and safe
working environment with little chance of breakdowns.
Follow the instructions clearly for disassembly and assembly of the pump and in the troubleshooting section.
spares and if possible mention the serial number of the pump when ordering spares.
Always replace elastomers as a set, eg diaphragms, balls and seats.
Disassembly and Re assembly Shut off air supply and allow residual Pressure to bleed off.
Turn pump upside down allow process fluid to drain away. If fluid is hazardous due care should be taken.
Make a mark to indicate the positioning of each liquid chamber relative to the housing.
FF-MM-294-REV - 00
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Insufficient or wrong lubricant in the air
the lubricant is as per the recommended chart, a thicker lubricant often makes the air valve work sluggishly.
Internal damage or excessive wear on
Proceed to dismantle the pump, examine component for wear, assemble carefully as instructed
Excessive moisture in supply air line. Ensure that the dew point of the supplied air is low enough. Install
air dryer or moisture separator on the supply line.
Improper seal between inner pistons, outer pistons
Air leakage into product from balls / seats area Air sucked into suction pipeline due to insufficiently tight joints on suction pipeline.
Proceed to dismantle the pump, examine component for wear, replace any worn components, re assembly carefully as instructed
will greatly enhance the life of the pump and will ensure a trouble free and safe
Follow the instructions clearly for disassembly and assembly of the pump and in the troubleshooting section.
spares and if possible mention the serial number of the pump when ordering spares.
Turn pump upside down allow process fluid to drain away. If fluid is hazardous due care should be taken.
1) Replacement of Diaphragma. Unscrew both bolt (30) & nut (26
proceed to remove the Outlet (3).
inlet (2) respectively. Examine the balls, seals (and seats) for wear.
b. Now unscrew hex socket head bolt
of any one side and proceed to remove the
chamber (6). Now repeat the same procedure to
remove the second outer chamber (6).
c. Now with the help of two
spanner hold one of the
across flat of one outer
flange (5) and rotate the
second outer flange (5).
It will disassemble the
outer flange assembly
from the shaft . Now
unscrew the hex. socket
head bolts (22) to
disassemble the inner
flange (4), diaphragm
(11) and outer flange
(5). Now remove the
spacer (9).
*For ALT series hold one o
disassemble it from the shaft
flange (4). Now pull out the shaft assembly out of the shaft housin
d. Now hold the shaft (7) in a vice with proper packing. Care must be taken not to damage the shaft outer surface.
Now remove the outer flange
*For ALT series remove the outer flange (5
diaphragm (11).
Replacement of Diaphragm Unscrew both bolt (30) & nut (26) as shown in the exploded view and
Outlet (3). Repeat the same procedure to remove
respectively. Examine the balls, seals (and seats) for wear.
unscrew hex socket head bolts (25) & nuts (26)
and proceed to remove the outer
Now repeat the same procedure to
remove the second outer chamber (6).
series hold one of the across flat of one outer flange(5) and rotate the second
disassemble it from the shaft . Remove backup diaphragm (11A), PTFE diaphragm (11
shaft assembly out of the shaft housing (A).
Now hold the shaft (7) in a vice with proper packing. Care must be taken not to damage the shaft outer surface.
Now remove the outer flange assembly with spanner.
T series remove the outer flange (5) and remove the Backup diaphragm (11
FF-MM-294-REV - 00
7
) and rotate the second outer flange(5) to
), PTFE diaphragm (11), spacer (9) & inner
Now hold the shaft (7) in a vice with proper packing. Care must be taken not to damage the shaft outer surface.
Backup diaphragm (11A), spacer (9) & PTFE
e. Now replace the diaphragms (11). Ensure that diaphragm orientation i
sticker side of the diaphragm (11) to be located in the outer chamber (6). N
reverse manner and remove the half shaft assembly from vice.
* Refer fig. A for ALT model the convex side o
(6). For the backup diaphragm (11
concave groove of PTFE diaphragm (11
* For ALS/ ALH model AIR SIDE marking to be located toward
f. Lubricate the edge of the shaft with specified lubricant. Slowly i
be taken not to damage the rubber rings (8).
g. Once the half shaft open portion comes out of the bush, follow the procedure in reverse manner as described in
part (a) & (b) and assemble the pump.
2) Replacement of Shaft O ringsa. For removing the rubber rings from bush, first follow the step a, b & c from the diaphragm replacement.
b. Now remove the seals with the help of needle Nose pliers. Care should be taken not to damage the inner face
of bush.
c. Once all the old seals are have been removed, the inside of the bushing should be cleaned to ensure no debris
is left that may damage to new seals (Pressurized air is preferable).
d. These following tools can be used to aid in the installation of new seals:
● Needle Nose pliers
● Phillips Screwdriver
● Electrical Tape
e. Wrap electrical tape around each leg of the needle nose pliers (heat shrink may also be used) . This is done to
prevent damaging the inside portion of the new seals.
f. With a new seal in hand, place the two
the seal diameter will allow, then two fingers pull down on the top portion of the seal to form kidney bean shape.
g. Lightly clamp the pliers together to hold the seal into the kidney s
kidney shape as possible, this will allow the seal to travel down the bushing bore easier.
h. With the seal clamped in the pliers, insert the seal into the bushing bore and position the bottom of the seal into
the correct groove. Once the bottom of the seal is seated in the groove, release the clamp pressure on the
pliers. This will allow the seal to partially snap back to its original shape.
i. After the pliers are removed, you will notice a slight bump in the se
resized, the bump in the seal should be removed as much as possible. This can be done with either the Phillips
screw driver or your finger, apply light pressure to the peak of the bump. This pressure will cause the
be almost completely eliminated.
j. Lubricate the edge of the shaft with
k. Slowly insert the shaft with rotating motion. This will complete the resizing of the seals.
l. Perform these steps for the remaining seals.
3) Replacement of Ball seat & Balla) Follow the step (a) of diaphragm replacement. Replace the ball (12) & seat (13) with new one.
* For ALT, SST series change the valve seat (13) &
4) Replacement of air valve and oring of end capa) Unscrew with the bolt (27) from the shaft housin
the help of bolt (With threading M6)
(16). Change the oring (19) of both end caps
b) While assembly first put the end cap with pin (18
matches with the drill hole of body. Push the
the air valve (16) from other
cap (17) with oring (19) from the other end and fit the circlip
c) You can also change the gasket f
manner.
Now replace the diaphragms (11). Ensure that diaphragm orientation is correct, i.e. For ALB/
sticker side of the diaphragm (11) to be located in the outer chamber (6). Now assemble the outer flange (5) in
reverse manner and remove the half shaft assembly from vice.
model the convex side of outer ring PTFE diaphragm (11) to be located in outer chamber
diaphragm (11A) the larger side of outer ring to be located in shaft housing (1) & small in the
ve groove of PTFE diaphragm (11).
IR SIDE marking to be located toward the shaft housing (1).
Lubricate the edge of the shaft with specified lubricant. Slowly insert the shaft with rotating motion. Care should
be taken not to damage the rubber rings (8).
Once the half shaft open portion comes out of the bush, follow the procedure in reverse manner as described in
part (a) & (b) and assemble the pump.
Replacement of Shaft O rings For removing the rubber rings from bush, first follow the step a, b & c from the diaphragm replacement.
Now remove the seals with the help of needle Nose pliers. Care should be taken not to damage the inner face
ll the old seals are have been removed, the inside of the bushing should be cleaned to ensure no debris
is left that may damage to new seals (Pressurized air is preferable).
These following tools can be used to aid in the installation of new seals:
Nose pliers
Phillips Screwdriver
Electrical Tape
Wrap electrical tape around each leg of the needle nose pliers (heat shrink may also be used) . This is done to
prevent damaging the inside portion of the new seals.
With a new seal in hand, place the two legs of the nose pliers inside the seal ring. Open the pliers as wide as
the seal diameter will allow, then two fingers pull down on the top portion of the seal to form kidney bean shape.
Lightly clamp the pliers together to hold the seal into the kidney shape. Be sure to pull the seal into as tight of a
kidney shape as possible, this will allow the seal to travel down the bushing bore easier.
With the seal clamped in the pliers, insert the seal into the bushing bore and position the bottom of the seal into
the correct groove. Once the bottom of the seal is seated in the groove, release the clamp pressure on the
pliers. This will allow the seal to partially snap back to its original shape.
After the pliers are removed, you will notice a slight bump in the seal shape. Before the seal can be properly
resized, the bump in the seal should be removed as much as possible. This can be done with either the Phillips
screw driver or your finger, apply light pressure to the peak of the bump. This pressure will cause the
be almost completely eliminated.
the edge of the shaft with specified lubricant.
Slowly insert the shaft with rotating motion. This will complete the resizing of the seals.
Perform these steps for the remaining seals.
seat & Ball Follow the step (a) of diaphragm replacement. Replace the ball (12) & seat (13) with new one.
series change the valve seat (13) & oring (13A) with new one.
4) Replacement of air valve and oring of end cap from the shaft housing (A). Now remove the circlips (20
the help of bolt (With threading M6) pull the end cap (17) & (18) from both ends. Now slide out the air
) of both end caps.
rst put the end cap with pin (18) in air valve body (14). Make sure the notch of end cap (18
matches with the drill hole of body. Push the end cap with oring (19) gently. Now fit the circlip (20
from other side ensuring the drill portion located in the pin of end cap (18
) from the other end and fit the circlip (20).
You can also change the gasket for air valve body (15). Now assemble the air valve assembly in reverse
FF-MM-294-REV - 00
8
s correct, i.e. For ALB/ALN/ALV the
ow assemble the outer flange (5) in
) to be located in outer chamber
side of outer ring to be located in shaft housing (1) & small in the
the shaft housing (1).
nsert the shaft with rotating motion. Care should
Once the half shaft open portion comes out of the bush, follow the procedure in reverse manner as described in
For removing the rubber rings from bush, first follow the step a, b & c from the diaphragm replacement.
Now remove the seals with the help of needle Nose pliers. Care should be taken not to damage the inner face
ll the old seals are have been removed, the inside of the bushing should be cleaned to ensure no debris
Wrap electrical tape around each leg of the needle nose pliers (heat shrink may also be used) . This is done to
legs of the nose pliers inside the seal ring. Open the pliers as wide as
the seal diameter will allow, then two fingers pull down on the top portion of the seal to form kidney bean shape.
hape. Be sure to pull the seal into as tight of a
kidney shape as possible, this will allow the seal to travel down the bushing bore easier.
With the seal clamped in the pliers, insert the seal into the bushing bore and position the bottom of the seal into
the correct groove. Once the bottom of the seal is seated in the groove, release the clamp pressure on the
al shape. Before the seal can be properly
resized, the bump in the seal should be removed as much as possible. This can be done with either the Phillips
screw driver or your finger, apply light pressure to the peak of the bump. This pressure will cause the bump to
Slowly insert the shaft with rotating motion. This will complete the resizing of the seals.
Follow the step (a) of diaphragm replacement. Replace the ball (12) & seat (13) with new one.
Now remove the circlips (20) from both ends. Now with
) from both ends. Now slide out the air valve
ke sure the notch of end cap (18)
. Now fit the circlip (20). Now slide
ocated in the pin of end cap (18). Now push the end
. Now assemble the air valve assembly in reverse
Exploded views DP75ALB/ALN/ALV/ALS/ALH - CR/G
CR/G
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Bill of material
* Mark indicates the fast moving components which are
Bill of material 3" ALB/ALN/ALV/ALS & ALH
Mark indicates the fast moving components which are recommended for stock.
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10
DP75ALT - CR/G
FF-MM-294-REV - 00
11
* Mark indicates the fast moving components which are recommended for stock.
Bill of material 3" ALT
Mark indicates the fast moving components which are recommended for stock.
FF-MM-294-REV - 00
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