OPERATOR’S MANUAL
6737X-XXX
RELEASED:
REVISED:
(REV. 02)
2-2-09
6-3-10
INCLUDING: SERVICE KITS, TROUBLESHOOTING, PARTS LIST,
DISASSEMBLY & REASSEMBLY.
TWO-BALL STYLE
LOWER PUMP ENDS
Also covers 637444-XXX 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.
The original language of this manual is English.
SERVICE KITS
Use only genuine ARO® replacement parts to assure compatible
pressure rating and longest service life.
637444-XXX for general repair of 6737X-XXX lower pump ends.
GENERAL DESCRIPTION
WARNING DO NOT EXCEED MAXIMUM OPERATING PRES-
SURE AS INDICATED ON PUMP MODEL PLATE.
WARNING REFER TO GENERAL INFORMATION SHEET FOR
ADDITIONAL SAFETY PRECAUTIONS AND IMPORTANT IN-
FORMATION.
This manual covers the lower pump section. It is one of four
documents which support an ARO pump. Replacement copies
of these forms are available upon request.
Figure 1
LOWER PUMP END DESCRIPTION CHART
6737 X - X X X
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NMXXXXX-XX-XXX Pump Model Operator’s Manual.
General Information for Air / Hydraulically Operated Piston
Pumps.
Lower Pump End Operator’s Manual.
Air / Hydraulic Motor Operator’s Manual.
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Pump Material
1 - 400 series stainless steel
2 - 300 series stainless steel
The two-ball design provides better priming of the lower foot
valve. The double acting feature is standard in all ARO indus-
trial pumps. Material is delivered to the pump discharge outlet
on both the up and down stroke.
Packing Material
C - UHMW-PE (upper and lower)
K - Carbon and Graphite filled PTFE with nitrile ener-
gizer (upper and lower)
MAINTENANCE
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)
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 entire pump
system with a solvent that is compatible with the material being
pumped.
Keep solvent cup filled with this compatible solvent. This will keep
the material from drying on the piston rod, which would 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 matter during dis-
assembly and reassembly.
Before reassembling, lubricate parts as required. When assembling
“O” rings, or parts adjacent to “O” rings, exercise care to prevent
damage to “O”rings and “O”ring groove surface.
Spring Arrangement
3 - No spring
6 - Wave spring
8 - No spring with alternate solvent cup
C - No spring with alternate seat material
D - Wave spring with alternate seat material
E - Wave spring with alternate solvent cup
F - No spring with alternate seat material and alternate
solvent cup
G - Wave spring with alternate seat material and alternate
solvent cup
Plunger Type
D - Hardened stainless steel with hard chrome plating
F - Stainless steel with hard chrome plating
Service Kit Selection
6737X - X X X
637444 - X X D
Example: Lower Pump End # 67371-C6D
Service Kit # 637444-C6D
Packing
Spring
INGERSOLL RAND COMPANY LTD
209 NORTH MAIN STREET – BRYAN, OHIO 43506
CCN 15262132
(800) 495-0276 FAX(800) 892-6276
© 2010
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PARTS LIST
Models 6737X-X8X
6737X-XEX
Models 6737X-X3X
6737X-X6X
6737X-XFX
6737X-XCX
6737X-XGX
6737X-XDX
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1
1
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50
52
51
52
51
53
44
45
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ꢃ
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75
12
26
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40
27
29
28
71
72
36
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6
88
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76
10
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8
9
8
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62 ꢃꢅ
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15
49
19
20
21
22
23
23
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ASSEMBLY TORQUE REQUIREMENTS
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NOTE: DO NOT OVERTIGHTEN FASTENERS.
(12) nut, 60 - 70 ft lbs (81.3 - 94.9 Nm).
(36) seat body, 100 - 110 ft lbs (135.6 - 149.1 Nm).
(62) cap screw, 295 - 305 ft lbs (400.0 - 413.5 Nm).
LUBRICATION / SEALANTS
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Keep solvent cup filled with a lubricant such as Wet-Sol
"Plus" or equivalent.
24
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Apply Loctite® 242® to mating threads.
Apply anaerobic pipe sealant to mating threads.
Apply Loctite nickel anti-seize to mating threads and faces.
Lubricate items with Wet-Sol “Plus”.
Figure 2
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1-1/4 - 11-1/2 NPTF - 2
6737X-XXX (en)
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repeated several times to assure small enough diameter has
been achieved to insure proper assembly.
15. Apply lubricant to inside of (9) tube and carefully slide (9) tube
over the (72) wiper and (71) “W” packing or (76) packing set,
and onto (6) outlet body. NOTE: Once the (9) tube has cleared
the packings, a rubber mallet may be used to drive (9) tube
into place.
16. Apply Loctite nickel anti-sieze to threads of (10) connecting
rods and assemble three (10) connecting rods to (15) inlet
body.
17. Assemble (15) inlet body and components to (9) tube, aligning
three (10) connecting rods with holes in (6) outlet body.
18. Assemble three (12) nuts to (10) connecting rods, securing
assembly. NOTE: Tighten (12) nuts to 60 - 70 ft lbs (81.3 - 94.9
Nm). NOTE: Draw (12) nuts equally together and then tighten.
TROUBLE SHOOTING
see view A
No material at outlet (pump continually cycles).
Check material supply. Disconnect or shut off the air supply
and replenish the material. Reconnect.
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Material on one stroke only (fast downstroke).
The (21) lower ball may not be seating in the (22) ball 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 dam-
aged, replace.
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Material on one stroke only (fast upstroke).
The (27) ball may not be seating in the (28) ball seat (see lower
pump disassembly). Remove (27) ball from (28) ball seat, clean
and inspect. If the (27) ball is damaged, replace. Check for worn
or damaged packings and seals. Replace the packings and seals
as necessary.
ꢂ
Material leakage out of the solvent cup or material appears 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.
ꢂ
see view B
Models 6737X-CXX
6737X-LXX
Models 6737X-KXX
6737X-PXX
6737X-RXX
View A
View A
Figure 3
View B
View B
Viton® is registered trademark of the DuPont Company
ARO® is a registered trademark of Ingersoll-Rand Company
Loctite® and 242® are registered trademarks of Henkel Loctite Corporation
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PN 97999-1207
6737X-XXX (en)
Page 4 of 4
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