OPERATOR’S MANUAL
6694X-XXX
RELEASED: 11-27-90
INCLUDING: SERVICE KITS, TROUBLESHOOTING, PARTS LIST & DISASSEMBLY & REASSEMBLY.
REVISED:
(REV. R)
6-2-10
TWO-BALL STYLE LOWER PUMP ENDS
66941-XXX (400 Series Stainless Steel)
66942-XXX (300 Series Stainless Steel)
Also covers 637211-XX3 service kits.
READ THIS MANUAL CAREFULLY BEFORE INSTALLING,
OPERATING OR SERVICING THIS EQUIPMENT.
It is the responsibility of the employer to place this information in the hands of the operator. Keep for future reference.
SERVICE KITS
LOWER PUMP END DESCRIPTION CHART
Use only genuine ARO® replacement parts to assure com-
patible pressure rating and longest service life.
637211-XX3 for general repair of 6694X-XXX lower pump
ends.
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6694X - X X X
Pump Material
1 - 400 series stainless steel
2 - 300 series stainless steel
GENERAL DESCRIPTION
Packing Material
WARNING
DO NOT EXCEED MAXIMUM OPERATING
PRESSURE AS INDICATED ON PUMP MODEL PLATE.
WARNING
C - UHMW-PE (upper and lower)
K - Carbon Graphite filled PTFE with Nitrile Energizer
(upper and lower)
REFER TO GENERAL INFORMATION SHEET
L - Mineral filled PTFE (upper and lower)
P - UHMW-PE / Mineral filled PTFE staggered (upper)
UHMW-PE (lower)
R - Mineral filled PTFE / UHMW-PE staggered (upper)
Mineral filled PTFE (lower)
FOR ADDITIONAL SAFETY PRECAUTIONS AND IMPOR-
TANT INFORMATION.
This manual only covers the lower pump section. It is one
of four documents which support an ARO pump. Replace-
ment copies of these forms are available upon request.
650XXX-X Pump Model Operator’s Manual
General Information - Air / Hydraulically Operated Piston
Pumps
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Spring Arrangement (Service kit spring designation)
3 - No spring (3)
6 - Wave spring (6)
C - No spring with alternate seat material (3)
D - Wave spring with alternate seat material (6)
ꢀ
ꢀ
Lower Pump End Operator’s Manual
Air / Hydraulic Motor Operator’s Manual
:
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The two-ball design provides better priming of the lower
foot valve. The double acting feature is standard in all ARO
industrial pumps. Material is delivered to the pump discharge
outlet on both the up and down stroke.
Plunger Type
3 - Hardened stainless steel with hard chrome plating (threaded)
6 - Stainless steel with hard chrome plating (threaded)
D - Hardened stainless steel with hard chrome plating (large motors)
F - Stainless steel with hard chrome plating (large motors)
MAINTENANCE
Service Kit Selection
6694X - X X X
637211 - X X 3
Packing
The air / hydraulic motor is completely separate from the
lower pump end. This helps to keep the motor from being
contaminated by the material being pumped. Periodically,
flush the entire pump system with a solvent that is compat-
ible with the material being pumped.
EXAMPLE: Lower Pump End # 66941-CDF
Service Kit # 637211-C63
Spring
Keep the solvent cup filled with this compatible solvent. This
will keep the material from drying on the piston rod, which
could drag through the packings, ruin them and eventually
scour the piston rod.
Provide a clean work surface to protect sensitive internal
moving parts from contamination from dirt and foreign mat-
ter during disassembly and reassembly.
Before reassembly, lubricate parts as required. When assem-
bling “O” rings or parts adjacent to “O” rings, exercise care to
prevent damage to “O”rings and “O”ring groove surface.
ARO® is a registered trademark of Ingersoll-Rand
Loctite® and 242® are registered trademarks of Henkel Loctite Corporation
Primer T™ is a trademark of Henkel Loctite Corporation
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INGERSOLL RAND COMPANY LTD
209 NORTH MAIN STREET – BRYAN, OHIO 43506
(800) 495-0276 FAX(800) 892-6276
© 2010
CCN 99711764
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PARTS LIST / 6694X-XXX
Models 66941-XX3
Models 66942-XX6
Models 66941-XXD
Models 66942-XXF
Models 6694X-C6X, -L6X, -P6X, -R6X
6694X-CDX, -LDX, -PDX, -RDX
50
26
26
52
51
52
51
53
44
ꢁ ꢀ 1
6
45
75
1-1/4 - 11-1/2 N.P.T.F. - 1
Models 6694X-K3X
6694X-KCX
8
10 ꢀ
TORQUE REQUIREMENTS
)
(
NOTE: DO NOT OVERTIGHTEN COMPONENTS.
(12) nut, 60 - 70 ft lbs (81.3 - 94.9 Nm).
(36) seat body, 100 - 110 ft lbs (135.6 - 149.1 Nm).
LUBRICATION / SEALANTS
Apply ARO Wet-Sol “Plus” to threads upon assembly.
Keep solvent cup filled with a lubricant such as ARO Wet-
Sol “Plus” or equivalent.
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S
Apply Loctite Nickel Anti-Seize to threads.
Apply Loctite 242 to threads.
Models 6694X-K3X
6694X-KCX
ꢁ
76
9
40
ꢀ
27
Models 6694X-C6X, -L6X, -P6X, -R6X
6694X-CDX, -LDX, -PDX, -RDX
29
28
ꢂ 36
20
71
72
8
15
12 ꢀꢀ
23
2 - 11-1/2 N..P.T.F. - 1
22
17
ꢁ
24
Figure 1
6694X-XXX (en)
Page 3 of 4
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1. Install (50) female washer, upper packings, (53) male
washer and (44) wave spring in (1) solvent cup. NOTE:
The wave spring is split and the wave where the split oc-
curs should be next to the metal back-up washer.
2. Install (45) washer in (6) pump body and screw (1) sol-
vent cup into (6) pump body (do not tighten).
3. Put (8) “O”ring on (6) pump body.
4. Apply lubricant to (26) plunger and upper packing. Care-
fully slide the above assembled parts, (1) solvent cup and
(6) pump body with internal packing arrangement over
the top of (26) plunger. Retain (6) pump body in bench
vise and tighten (1) solvent cup (ARO tool 637406 is
available to tighten solvent cup). Carefully lay assembled
parts aside for future assembly.
5. Put lower packing on (36) seat body.
6. Install (40) retaining ring on (36) seat body and lay aside
for future assembly.
7. Put other (8) “O”ring onto (15) foot valve body.
8. Place (20) pin, (17) ball, (23) gasket and (22) ball seat
(bevel up) into (15) foot valve body and screw in (24)
seat retainer.
small enough diameter has been achieved to insure
proper assembly.
12. Apply lubricant to inside of (9) suction tube and carefully
slide over the assembled (71) packing and (72) wiper and
onto the (6) pump body.
NOTE: Once the suction tube has cleared (71) packing and
(72) wiper, a rubber mallet can be used to drive (9) suction
tube into place.
13. Apply lubricant to (8) “O” ring and assemble to (15) foot
valve body, then assemble (15) foot valve body into (9)
suction tube. A rubber mallet can be used in this applica-
tion.
14. Align the three holes in (15) foot valve body with the
three threaded holes in (6) pump body. Screw (10) tie
rods into (6) pump body. NOTE: Rods are to be flush with
the top side of (6) pump body. Using the flats provided
on (10) tie rod, secure the entire assembly with (12) nuts.
NOTE: Tighten (12) nuts to 60 - 70 ft lbs (81.3 - 94.9 Nm).
NOTE: Do not tighten each nut completely at once but
draw them equally together and then tighten.
Position the (20) pin in the (15) foot valve body as described
in the following paragraph.
TROUBLE SHOOTING
A. Bottom holes (closest to ball) should be used for
light viscosity materials.
B. Center holes for medium viscosity materials (as as-
sembled from factory).
C. Top holes for heavy viscosity materials.
No material at outlet (pump continually cycles).
Check material supply. Disconnect or shut off the air sup-
ply and replenish the material. Reconnect.
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Material on one stroke only (fast downstroke).
NOTE: These assembled parts are to be laid aside for future
assembly.
9. Place assembled (26) plunger, (6) pump body and (1) sol-
vent cup, with packing upright, in a bench vise, retained
by the flats on (26) plunger at (1) solvent cup end. NOTE:
Plunger to be vertical in vise.
10. Put (27) ball in ball guide end of (26) plunger. Place (29)
gasket on sealing surface above ball guide. Apply Loctite
242 to threads of (26) plunger. Place (28) ball seat (bevel
up) into (36) seat body and assemble to (26) plunger.
NOTE: Tighten (36) seat body to 100 - 110 ft lbs (135.6
- 149.1 Nm). NOTE: ARO tool 637404-B is available to as-
semble body and plunger.
11. Lip on (72) wiper is to be rolled inward using a flat sur-
face with no sharp edges (such as a steel dowel rod) to
prevent damage of packing plus easier assembly. This
process may have to be repeated several times to assure
The (17) lower ball may not be seating in the (22) seat
(see lower pump disassembly). Remove the ball from the
seat, clean and inspect the ball and seat area. If the ball or
seat is damaged, replace.
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Material on one stroke only (fast upstroke).
Check for worn or damaged packings and seals. Replace
the packings and seals as necessary.
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Material leakage out of the solvent cup or material ap-
pears on the pump plunger rod.
Relieve the pressure in the pump and tighten the solvent
cup until leakage discontinues. If this procedure does not
aid in stopping the leakage problem, the upper packings
may be worn (see lower pump disassembly). Replace the
packings as necessary.
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PN 97999-12
Page 4 of 4
6694X-XXX (en)
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