ARO PD02P series Operator's Manual - Page 6

Browse online or download pdf Operator's Manual for Water Pump ARO PD02P series. ARO PD02P series 8 pages. 1/4" diaphragm pump

Print Page

GENERAL PUMP REPAIR NOTES:

Tools needed to complete disassembly and repair:

5/16" wrench or socket, 7/16" socket, 5/8" wrench or socket,

1/4" Allen wrench, 5/16" Allen wrench, spanner wrench, torque

wrench (measuring inch pounds), O" ring pick.

Once the pump is disassembled, you have the opportunity to clean

and inspect all parts for wear. Look for deep scratches on metallic

surfaces and nicks or cuts in O" rings. Replace old parts with new

ones as necessary.

Take precautions to prevent cutting O" rings upon installation.

Lubricate ``O" rings and U" cups with Lubriplate. A packet of this

lubricant is included in each Service Kit.

Do not over tighten fasteners. Refer to torque specification block

on page 5.

Re torque fasteners following restart.

Service Kits available. From your local distributor.

(Kits also include Lubriplate grease packet.)

SERVICE KIT: 637314 XX contains parts for a complete pump rebuild.

SERVICE KIT: 637276 contains parts to rebuild the air valve.

SERVICE KIT: 637313 XX contains parts to rebuild the

diaphragms and checks.

FLUID SECTION DISASSEMBLY

1. Place the pump on a flat workbench.

2. Using 7/16" sockets, remove six (62) nuts and (131) bolts.

3. Set the pump on end, with the air inlet" end up.

4. Using a flat blade screwdriver, remove (17) air inlet manifold and

(A") fluid cap.

5. Remove (13) back up ring and (33) O" ring from (A") fluid cap.

6. Remove two (147) O" rings from (A") fluid cap.

7. Remove (18) manifold and (B") fluid cap.

8. Remove (13) back up ring and (33) O" ring from (B") fluid cap.

9. Using 5/8" wrenches on (6) diaphragm screws, unthread and re

move diaphragm assemblies.

NOTE: Air valve section can be repaired at this time, refer to Air

Valve Disassembly".

10. Using a 5/16" wrench or flat blade screwdriver, remove two (43)

screws from (17) air inlet manifold.

11. Separate (17) air inlet manifold and (A") fluid cap. NOTE: (41)

spring stops and (22) discs may fall out. If not, remove at this time.

12. Remove (19) seals and (161) O" rings.

13. Disassembly of the opposite end of the pump is the same as the air

inlet" end, except for the following: a.) the opposite end does not

contain (161) O" rings and b.) the top tube has the outside shoul

der, the bottom tube has the inside shoulder.

14. Wrap (1) rod in a shop rag and secure in a soft faced vise.

15. Using a 5/8" wrench, unthread (6) diaphragm screw from (1) rod.

16. Using a 5/8" wrench on (6) diaphragm screw and a spanner wrench

on (5) washer, unthread and remove (6) diaphragm screw.

FLUID SECTION REASSEMBLY

NOTE: Lubricate all O" rings, U" cups seals and their mating parts with

94276 Lubriplate upon assembly.

1. Place the new (7) diaphragms on the (6) diaphragm screw, with the

bowed side of the diaphragm oriented against (6) diaphragm screw.

2. Assemble (5) washer to (6) diaphragm screw and torque to 75 85

in. lbs (8.5 9.6 Nm), using a spanner wrench and a 5/8" wrench.

NOTE: Be sure not to strip the plastic nut.

3. Assemble (1) rod to one of the diaphragm assemblies and tighten

finger tight.

4. Models PD02P XXS XTT only: Assemble (64) O" rings into

grooves in (68 and 69) air caps.

PAGE 6 OF 8

PUMP DISASSEMBLY AND REASSEMBLY

5. Assemble diaphragm assemblies into air caps and torque to 75 85

in. lbs (8.5 9.6 Nm), using 5/8" wrenches.

6. Assemble two (147) O" rings to the raised air passages, opposite

each other, inside (68) air cap.

7. Set (A") fluid cap on the workbench, with the tube side" down.

8. Assemble two (161) O" rings to counterbores in (A") fluid cap.

9. Assemble (22) disc and (41) spring stop to the check seat nearest the

top tube of (A") fluid cap (top tube has the shoulder on the outside).

10. Assemble (41) spring stop and (22) disc (disc on top) to check seat

nearest the bottom tube (shoulder on outside).

11. Lubricate seal grooves in (17) air inlet manifold and assemble (19)

seals to grooves.

12. Assemble (17) air inlet manifold to (A") fluid cap, aligning fluid inlet

with lower tube (shoulder on outside).

13. Secure with two (43) screws. Torque to 20 25 in. lbs (2.3 2.8 Nm),

using a 5/16" wrench.

14. Repeat steps 9 thru 13 for opposite end of pump. NOTE: The tubes

are reversed on (B") fluid cap (top tube has outside shoulder).

15. Assemble (33) O" rings and (13) back up rings to the outside shoul

der of tubes of (A" and B") fluid caps.

16. Assemble (17) air inlet manifold and components into (68) air cap,

being sure to align groove in manifold with rib in air cap.

17. Assemble (18) manifold and components into (69) air cap, being

sure to align groove in manifold with rib in air cap.

18. Assemble six (131) bolts and (62) nuts to pump and torque to 70 in.

lbs max (7.9 Nm max), using 7/16" sockets, hold the nut, torque the

bolt only. NOTE: Allow the pump to sit for at least 15 minutes, then

re torque bolts to 70 in. lbs max (7.9 Nm max).

AIR VALVE SECTION DISASSEMBLY

1. Refer to Fluid Section Disassembly", steps 1 thru 9.

2. Separate (68 and 69) air caps, releasing (103) bushing and logo

plates.

3. Remove air valve assembly, (102, 137 and 146) O" rings and (144)

U" cups from air caps.

4. Remove (111) spool assembly, (178) trip rods and (179) sleeve as

sembly from (145) valve block.

5. Remove O" rings and U" cup from (111) spool assembly.

6. Inspect (119) O" rings on (178) trip rods and (179) sleeve assembly.

7. Remove three (134) screws, releasing (145) minor valve block and

(132) gasket.

AIR VALVE SECTION REASSEMBLY

1. Assemble (132) gasket and (145) minor valve block to (135) valve

block, securing with three (134) screws. NOTE: Torque to 4 6 in.

lbs (.45 .68 Nm).

2. Assemble (119) O" rings to (178) trip rods and (179) sleeve assembly.

3. Assemble (178) trip rods and (179) sleeve assembly into (145)

valve block.

4. Assemble (138 and 180) O" rings and (110) U" cup to (111) spool

assembly.

5. Assemble (111) spool assembly into (135) valve block, with small

end of spool going into valve block first.

6. Assemble (102, 137 and 146) O" rings to valve block.

7. Assemble (144) U" cups to (68 and 69) air caps.

8. Place one (68 or 69) air cap on end, with legs down and seat valve

block into air cap.

9. Assemble logo plates and (103) bushing into air cap.

10. Assemble other air cap to air cap, aligning logo plates, (178) trip rod

and (103) bushing.

11. Refer to Fluid Section Reassembly", steps 5 thru 18 to complete

reassembly.

PD02P X