OPERATOR’S MANUAL
6661HX-XXX-C
RELEASED: 12-18-06
INCLUDING: OPERATION, INSTALLATION & MAINTENANCE
REVISED:
(REV. 04)
5-20-10
1" DIAPHRAGM PUMP
CSA CERTIFIED, 1:1 RATIO, METALLIC
INTENDED FOR USE WITH SWEET NATURAL GAS
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
Refer to Model Description Chart to match the pump mate-
rial options.
637118-C for gas section repair (see page 6).
637119-C9-C for fluid section repair (see page 4).
PUMP DATA
Models. . . . . . . . . . . . . see Model Description Chart for “-XXX”
Pump Type. . . . . . . . . Gas Operated Double Diaphragm
Material. . . . . . . . . . . . see Model Description Chart
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 lbs (8.62 kgs)
Maximum Gas Inlet Pressure . . . . . . . 120 p.s.i.g. (8.3 bar)
Maximum Material Inlet Pressure. . . 10 p.s.i.g. (0.69 bar)
Maximum Outlet Pressure . . . . . . . . . . 120 p.s.i.g. (8.3 bar)
(flooded inlet)
Maximum Flow Rate
. . . 35 g.p.m. (133 l.p.m.)
Figure 1
Displacement / Cycle @ 100 p.s.i.g. . 0.156 gal. (0.59 lit.)
Maximum Particle Size . . . . . . . . . . . . . 1/8”dia. (3.2 mm)
Maximum Temperature Limits . . . 32° to 125° F (0° to 52° C)
Dimensional Data. . . . . . . . . . . . . . . . . . . see page 8
MODEL DESCRIPTION CHART
Noise Level @ 70 p.s.i., 60 c.p.m.. . . . . . 64.5 db(A)
c
6661 H 0 - 1 C 9 - C
The pump sound pressure levels published here have been updated to
an Equivalent Continuous Sound Level (LAeq) to meet the intent of ANSI
S1.13-1971, CAGI-PNEUROP S5.1 using four microphone locations.
c
Center Section Material, Fluid Connection
H - Aluminum, 1 - 11-1/2 N.P.T.F. - 1
Fluid Cap / Manifold Material, Hardware
0 - Aluminum, Carbon Steel
Seat Material
1 - Aluminum
Ball Material
C - Hytrel®
Diaphragm Material
9 - Hytrel
Fluid Section Service Kit Selection
6661H0 - 1 X X - C
637119 - X X - C
EXAMPLE: Model #6661H0-1C9-C
Fluid Section Service Kit # 637119-C9-C
Ball
Diaphragm
INGERSOLL RAND COMPANY LTD
209 NORTH MAIN STREET – BRYAN, OHIO 43506
© 2010
CCN 15276603
(800) 276-4658 FAX (800) 266-7016
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GENERAL DESCRIPTION
MAINTENANCE
The ARO natural gas powered diaphragm pump offers high
volume delivery even at low gas pressure. Natural gas pow-
ered diaphragm pumps move fluids such as crude oil, salt
water, drilling mud, lubrication oils, glycol, caustic liquids and
acids. ARO pumps feature stall resistant design, modular gas
motor / fluid sections.
Gas operated double diaphragm pumps utilize a pressure
differential in the gas chambers to alternately create suc-
tion and a positive fluid pressure in the fluid chambers, ball
checks insure a positive flow of fluid.
Pump cycling will begin as gas pressure is applied and it will
continue to pump and keep up with the demand. It will build
and maintain line pressure and will stop cycling once maxi-
mum line pressure is reached (dispensing device closed) and
will resume pumping as needed.
Certain ARO “Smart Parts” are indicated which should be
available for fast repair and reduction of down time.
Provide a clean work surface to protect sensitive internal
moving parts from contamination from dirt and foreign
matter during service disassembly and reassembly.
Keep good records of service activity and include the
pump in preventive maintenance program.
Service kits are available to service two separate dia-
phragm pump functions: 1. GAS SECTION, 2. FLUID SEC-
TION. The Fluid Section is divided further to match typical
active Material Options.
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Before disassembling, empty captured material in the
outlet manifold by turning the pump upside down to
drain material from the pump.
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FLUID SECTION DISASSEMBLY
1. Remove top manifold(s).
2. Remove (22) balls, (19) “O”rings and (21) seats.
3. Remove (15) fluid caps.
4. Remove (14) screws, (6) washers, (7) diaphragms and (5)
washers.
GAS AND LUBE REQUIREMENTS
WARNING EXCESSIVE GAS PRESSURE. Can cause pump
damage, personal injury or property damage.
A filter capable of filtering out particles larger than 50
microns should be used on the gas supply. There is no lu-
brication required other than the “O” ring lubricant which
is applied during assembly or repair.
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5. Remove (3) “O” rings. NOTE: Do not scratch or mar the
surface of (1) diaphragm rod.
If lubricated gas is present, make sure that it is compat-
ible with the “O” rings and seals in the gas motor section
of the pump.
FLUID SECTION REASSEMBLY
Reassemble in reverse order.
Clean and inspect all parts. Replace worn or damaged
parts with new parts as required.
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OPERATING INSTRUCTIONS
Always flush the pump with a solvent compatible with
the material being pumped if the material being pumped
is subject to “setting up” when not in use for a period of
time.
Disconnect the gas supply from the pump if it is to be
inactive for a few hours.
The outlet material volume is governed not only by the
gas supply, but also by the material supply available at
the inlet. The material supply tubing should not be too
small or restrictive. Be sure not to use hose which might
collapse.
Lubricate (1) diaphragm rod and (2) “O” ring with Key-
Lube grease.
Use ARO pn 98930-T bullet (installation tool) to aid in in-
stallation of (2) “O”ring on (1) diaphragm rod.
Be certain (7) diaphragms align properly with (15) fluid
caps before making final torque adjustments on bolt and
nuts to avoid twisting the diaphragm.
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Re-check torque settings after pump has been re-started
and run a while.
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When the diaphragm pump is used in a forced-feed
(flooded inlet) situation, it is recommended that a “check
valve”be installed at the gas inlet.
Secure the diaphragm pump legs to a suitable surface to
insure against damage by vibration.
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Loctite® is a registered trademark of Henkel Loctite Corporation 271™, 262™, 572™ and 577™ are trademarks of Henkel Loctite Corporation
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Hytrel® and Viton® are registered trademarks of the DuPont Company ARO® is a registered trademark of Ingersoll-Rand Company
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6661HX-XXX-C (en)
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PARTS LIST / 6661HX-XXX-C FLUID SECTION
637119-C9-C fluid section service kits include: Balls (item 22), diaphragms (item 7) plus items 2, 3, 19 and 93706-1 Key-Lube
grease (page 6).
PARTS LIST
(size)
(size)
Item Description
Qty Part No.
(1) 98724-1
(1) Y330-113
(4) Y328-14
(2) 93441-2
(2) 93441-2
(2) 90533-9
(2) 93189-1
(2) Y5-85-T
(2) 94945
[Mtl]
[C]
Item Description
16 Manifold
Qty Part No.
(2) 92001
[Mtl]
[A]
[V]
[A]
[H]
[C]
[C]
1
2
3
5
6
7
9
Rod
“O” Ring
“O” Ring
†
(3/32” x 3/4” o.d.)
(1/16” x 5/8” o.d.)
(3/32” x 1-9/16” o.d.)
[B]
[T]
19 “O” Ring
21 Seat
(4) Y327-126
(4) 92008-1
(4) 90532-C
(8) Y6-55-C
(16) Y12-5-C
(1) 93004
(3-5/8” o.d.)
(1” diameter)
Washer - Air side
Washer - Fluid side
Diaphragm
[C]
[C]
[H]
[SS]
[SS]
[A]
22 Ball
26 Bolt
29 Nut
43 Ground Lug
57 Ground Kit Assembly
(5/16” - 18 x 1”)
(5/16" - 18)
†
(0.505” i.d.)
(see page 7)
Washer
[Co]
- - -
(1/2” - 20 x 1”)
(not shown)
14 Screw
15 Fluid Cap
(1) 66885-1
MATERIAL CODE
“Smart Parts”, keep these items on hand in addition to the service kit for fast repair and reduction of down time.
†
[A] = Aluminum
[B] = Nitrile
[C] = Carbon Steel
[Co] = Copper
[H] = Hytrel
[SS] = Stainless Steel
[T] = PTFE
[V] = Viton®
Page 4 of 8
6661HX-XXX-C (en)
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PARTS LIST / 6661HX-XXX-C FLUID SECTION
3
2
1
4
FOR THE GAS MO-
TOR SECTION, SEE
PAGES 6 & 7.
5
7
8
6
26
16
(
Torque Sequence
2
1
3
5
7
6
3
9
14
( ‹
œ
œ
œ
€
€
œ
22
19
21
œ
15
29
(
œ
22
21
19
16
26
(
Figure 2
TORQUE REQUIREMENTS
)
(
NOTE: DO NOT OVERTIGHTEN FASTENERS.
(14) Bolt, 25 - 30 ft. lbs (33.9 - 40.7 Nm).
(26) Bolt, 120 - 140 in. lbs (13.6 - 15.8 Nm).
(29) Nut, 120 - 140 in. lbs (13.6 - 15.8 Nm).
Gas side
Fluid side
LUBRICATION / SEALANTS
Apply Loctite® 271™ to threads.
‹
œ
Apply Key-Lube grease (93706-1) to all “O” rings, “U” cups and mating
parts.
Cross section view of diaphragm.
6661HX-XXX-C (en)
NOTICE: Radius edge of parts (5 and 6) is against diaphragm.
€
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PARTS LIST / 6661HX-XXX-C GAS MOTOR SECTION
Indicates parts included in 637118-C gas section repair kit.
9
GAS MOTOR PARTS LIST
(size)
(size)
Item Description
101 Motor Body
(Qty) Part No.
(1) 94743
(2) Y325-20
(1) 94527
(2) Y145-25
(8) 93860
(2) 92003
(1) 92878
(1) 92011
(1) Y186-51
(1) 92005
(5) 92877
(5) Y325-214
(6) Y325-126
(4) 92876
(1) 92006
[Mtl]
[A]
Item Description
(Qty) Part No.
(1) 92004
(1) 93309-1
(4) 93075
(3) 115959
(2) 98723-1
(2) 94820
(4) Y154-41
(16) 92866
(1) Y227-2-L
[Mtl]
[B/Ny]
[C]
[U]
[Z]
[Bz]
[U]
[C]
[C]
[C]
117 Gasket
118 Pilot Rod
119 “O” Ring
120 Spacer
121 Sleeve Bushing
122 “O” Ring
9
(1/16” x 1” o.d.)
102 “O” Ring
103 Sleeve
[B]
[D]
[C]
[C]
[C]
[B/Ny]
[D]
[B]
[A]
[Z]
9
(1/8” x 3/4” o.d.)
ꢁ
9
(0.925 i.d.)
104 Retaining Ring
9
(1/4” - 20 x 5/8”)
105 Screw
107 Leg
(3/32” x 9/16” o.d.)
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9
(with notch)
(#8 - 32 x 3/8”)
108 Gasket
109 Piston
110 “U” Cup
111 Spool
112 Washer
113 “O” Ring
114 “O” Ring
115 Spacer
116 Spacer
123 Screw
9
(5/16” - 18 x 1-3/4”)
ꢁ
124 Stud
(3/16” x 1-3/8” o.d.)
(1/8 - 27 N.P.T. x 1/4”)
(1/4”)
128 Pipe Plug
133 Lockwasher
197 Button Head Screw
198 Button Head Screw
9
ꢁ
(1) Y14-416-T [SS]
(2) 94987
(1) 94987-1
(1.557” o.d.)
(1/4” - 20 x 1/4”)
(1/4” - 20 x 3/8”)
ꢁ
[SS]
[SS]
(1/8” x 1-1/4” o.d.)
(3/32” x 1-9/16” o.d.)
[B]
[B]
[Z]
[Z]
9
9
ꢁ
Key-Lube “O” Ring Lubricant
Key-Lube, 10 Pack
(1) 93706-1
637175
9
ꢁ
“Smart Parts”, keep these items on hand in addition to the service kit for fast repair and reduction of down time.
†
MATERIAL CODE
PILOT VALVE REASSEMBLY
[A] = Aluminum
[B] = Nitrile
[Bz] = Bronze
[C] = Carbon Steel
[D] = Acetal
[Ny] = Nylon
[SS] = Stainless Steel
[U] = Polyurethane
[Z] = Zinc
1. Replace two (102) “O”rings, if worn or damaged, and rein-
stall (103) sleeve.
2. Install one of the (121) sleeve bushings, (119) “O” rings,
(120) spacers and the remaining (121) bushing.
3. Carefully push (118) pilot rod into bushing etc. and retain
on each end with the two (122) “O” rings. Retain with
(123) screws.
GAS MOTOR SECTION SERVICE
Service is divided into two parts - 1. Pilot Valve, 2. Major
Valve.
4. Replace (104) retaining rings.
GENERAL SERVICE NOTES:
Gas Motor Section service is continued from Fluid Section
repair.
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MAJOR VALVE DISASSEMBLY
Inspect and replace old parts with new parts as neces-
sary. Look for deep scratches on metallic surfaces, and
nicks or cuts in “O”rings.
Take precautions to prevent cutting “O” rings upon instal-
lation.
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1. Remove (107) legs and (108 and 117) gaskets.
2. On the side opposite the air inlet, push on the inner di-
ameter of (111) spool. This will force the (109) piston out.
Continue pushing the (111) spool and remove. Check for
scratches and gouges.
3. Reach into the gas section (exhaust side) and remove
(116) spacer, (115) spacers, (113) “O” rings, (114) “O” rings,
(112) washers, etc. Check for damaged “O”rings.
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Lubricate “O”rings with Key-Lube grease.
Do not over-tighten fasteners. Refer to torque specifica-
tion block on view.
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Re-torque fasteners following restart.
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MAJOR VALVE REASSEMBLY
PILOT VALVE DISASSEMBLY
1. Remove (104) retaining ring.
2. Remove (123) screws and (122) “O”rings.
3. Remove (118) piston rod, (121) sleeve bushing, (119) “O”
rings and (120) spacers from the (101) motor body.
4. Remove (103) sleeve and (102) “O”rings.
1. Replace (112) washer, (114) “O” ring and (113) “O” ring
onto (115) spacer and insert etc. NOTE: Be careful to ori-
ent spacer legs away from blocking internal ports.
2. Lubricate and carefully insert (111) spool.
3. Install (117) gasket and (107) leg.
4. Lubricate and install (110) packing cup and insert (109)
piston into (air inlet side) cavity, the (110) packing cup
lips should point outward.
5. Install (108) gasket and replace (107) leg.
Page 6 of 8
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PARTS LIST / 6661HX-XXX-C GAS MOTOR SECTION
IMPORTANT
BE CERTAIN TO ORIENT (115) SPACER LEGS
AWAY FROM BLOCKING INTERNAL PORTS
WHEN REASSEMBLING GAS SECTION.
117
111
œ
115
116
114
œ
105
107
(
113
œ
112
MAJOR VALVE
See cross section detail, figure 4.
‘
128
101
197
Figure 3
104
123
121
43
„
124
197
œ
102
103
104
œ
œ
133
198
105
107
)
119
109
110
121
123
118
122
„
œ
108
œ
œ
120
PILOT VALVE
MAJOR VALVE CROSS SECTION DETAIL
109 110 112 114 113 115 111
116
œ
œ
œ
œ
) TORQUE REQUIREMENTS (
NOTE: DO NOT OVERTIGHTEN FASTENERS.
(105) Torque to 40 - 50 in. lbs (4.5 - 5.6 Nm).
LUBRICATION / SEALANTS
œ
„
Apply Key-Lube grease to all “O” rings, “U”
cups and mating parts.
Apply Loctite 262™ to threads.
‘ Apply Loctite 572™ to threads.
Figure 4
Apply Loctite 577™ to threads.
6661HX-XXX-C (en)
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TROUBLE SHOOTING
Product discharged from exhaust outlet.
Low output volume, erratic flow or no flow.
Check for diaphragm rupture.
Check gas supply.
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Check tightness of (14) diaphragm screw.
Check for plugged outlet hose.
Check for kinked (restrictive) outlet material hose.
Check for kinked (restrictive) or collapsed inlet material
hose.
Gas bubbles in product discharge.
Check connections of suction plumbing.
Check “O”rings between intake manifold and fluid caps.
Check tightness of (14) diaphragm screw.
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Check for pump cavitation - suction pipe should be sized
at least as large as the inlet thread diameter of the pump
for proper flow if high viscosity fluids are being pumped.
Suction hose must be a non-collapsing type, capable of
pulling a high vacuum.
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Check all joints on the intake manifolds and suction con-
nections. These must be gas tight.
Inspect the pump for solid objects lodged in the dia-
phragm chamber or the seat area.
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DIMENSIONAL DATA
Dimensions shown are for reference only, they are displayed in inches and millimeters (mm).
L (outlet)
Gas inlet 1/4 - 18 N.P.T.F. - 1
A
E
B
G
F
D
H
K
J
C
(inlet) L
DIMENSIONS
Figure 5
A - 8-1/2”(215.9 mm)
E - 8” (203.2 mm)
H - 6-1/4” (158.8 mm)
J - 7-5/16" (185.7 mm)
K - 7/16” (11.1 mm)
B - 11-9/16”(293.7 mm) F - 6-1/2” (165.1 mm)
C - 4”(101.6 mm)
D - 1-1/4”(31.8 mm)
G - 12-1/2” (317.5 mm)
Pump Model
6661H0-1C9-C
“L”Material Inlet / Outlet
1 - 11-1/2 N.P.T.F. - 1
PN 97999-1236
Page 8 of 8
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