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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.


, 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.


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

2

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


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


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


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

5

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


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.


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.


Make a mark to indicate the positioning of each liquid chamber relative to the housing.

FF-MM-294-REV - 00

6

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


spares and if possible mention the serial number of the pump when ordering spares.


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


Lightly clamp the pliers together to hold the seal into the kidney shape. Be sure to pull the seal into as tight of a


With the seal clamped in the pliers, insert the seal into the bushing bore and position the bottom of the seal into


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


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


hape. Be sure to pull the seal into as tight of a


With the seal clamped in the pliers, insert the seal into the bushing bore and position the bottom of the seal into


al shape. Before the seal can be properly


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

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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.

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