Sandpiper S30, Service & Operating Manual

s30nmdl2sm-rev0614 

                                                 Model S30 Non-Metallic Page 28

DIAPHRAGM SERVICING

To service the diaphragms first 

shut off the suction, then shut off the 

discharge lines to the pump. Shut 

off the compressed air supply, bleed 

the pressure from the pump, and 

disconnect the air supply line from the 

pump. Drain any remaining liquid from 

the pump.

Step #1:

 See the pump composite 

repair parts drawing, and the diaphragm 

servicing illustration.

Using a 

9

/

16

" wrench or socket, 

remove the 16 capscrews (items 11), 

hex nuts and washers that fasten the 

elbows (items 19) to the outer chambers 

(items 15). Remove the elbows with the 

manifolds and spacers attached.

Step #2:

 Removing the outer 

chambers.

Using a 

9

/

16

" wrench or socket, 

remove the 20 capscrews (items 9 & 

12), hex nuts and washers that fasten 

the outer chambers, diaphragms, and 

inner chambers (items 16) together.

Step #3:

 Removing the diaphragm 

assemblies.

Use a 1

3

/

8

" (35mm) wrench or 

six pointed socket to remove the 

diaphragm assemblies (outer plate, 

diaphragm, and inner plate) from the 

diaphragm rod (item 33) by turning 

counterclockwise.

Insert a 1/4-20 capscrew or set 

screw into the smaller tapped hole in 

the inner diaphragm plate (item 30). 

Insert the protruding stud and the 1/4-

20 fastener loosely into a vise. Use a 

1

3

/

8

" wrench or socket to remove the 

outer diaphragm plate (item 29) by 

turning counterclockwise. Inspect the 

diaphragm (item 17) for cuts, punctures, 

abrasive wear or chemical attack. 

Replace the diaphragms if necessary.

Step #4:

 Installing the diaphragms.

Push the threaded stud of the outer 

diaphragm plate through the center 

hole of the diaphragm. Thread the inner 

plate clockwise onto the stud. Use a 

torque wrench to tighten the diaphragm 

assembly together to 480 in Lbs. (54.23 

Newton meters). Allow a minimum of 15 

minutes to elapse after torquing, then 

re-torque the assembly to compensate 

for stress relaxation in the clamped 

assembly.

Step #5:

 Installing the diaphragm 

assemblies to the pump.

Make sure the bumper (item 6) is 

installed over the diaphragm rod.

Thread the stud of the one diaphragm 

assembly clockwise into the tapped 

hole at the end of the diaphragm rod 

(item 33) until the inner diaphragm plate 

is flush to the end of the rod. Insert rod 

into pump.

Align the bolt holes in the diaphragm 

with the bolt pattern in the inner chamber 

(item 16). Make sure the molded 

directional arrows on the diaphragm 

point vertically. 

Fasten the outer chamber (item 15) 

to the pump, using the capscrews (items 

9 & 12), hex nuts and flat washers. 

On the opposite side of the pump, 

pull the diaphragm rod out as far as 

possible. Make sure the bumper (item 

6) is installed over the diaphragm rod. 

Thread the stud of the remaining 

diaphragm assembly clockwise into the 

tapped hole at the end of the diaphragm 

rod (item 33) as far as possible and still 

allow for alignment of the bolt holes 

in the diaphragm with the bolt pattern 

in the inner chamber. The molded 

directional arrows on the diaphragm 

must point vertically.

Fasten the remaining outer chamber 

(item 15) to the pump, using the 

capscrews (items 9 & 12), hex nuts and 

flat washers.

Step #6:

 Re-install the elbow/

spacer/manifold assemblies to the 

pump, using the capscrews (items 11), 

hex nuts and flat washers.

The pump is now ready to be  

re-installed, connected and returned to 

operation.

OVERLAY DIAPHRAGM SERVICING

The PTFE overlay diaphragm (item 

18) is designed to fit snugly over the 

exterior of the standard TPE diaphragm 

(item 17).

 The molded directional arrows 

on the overlay diaphragm must point 

vertically.

Follow the same procedures 

described for the standard diaphragm 

for removal and installation.

Read these instructions 

c om ple t e ly,  be for e 

installation and start-up. 

It is the responsibility of 

the purchaser to retain 

this manual for reference. Failure to 

comply with the recommendations stated 

in this manual will damage the pump, and 

void factory warranty.

IMPORTANT