OPERATOR’S MANUAL
6720X-XXX
RELEASED:
REVISED:
(REV. L)
7-24-98
6-1-10
INCLUDING: SERVICE KITS, TROUBLESHOOTING, PARTS LIST & DISASSEMBLY & REASSEMBLY.
FOUR-BALL STYLE LOWER PUMP ENDS
67200-XXX (3” i.d.)
67201-XXX (3-1/2” i.d.)
Also covers 637317-XXX and 637318-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 com-
patible pressure rating and longest service life.
637317-X4X for general repair of 67200-XXX lower pump
ends.
637318-X4X for general repair of 67201-XXX lower pump
ends.
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LOWER PUMP END DISASSEMBLY
NOTE: All threads are right hand.
CAUTION: Items (9) tube and (26) pump rod are ceramic
coated. Handle with care so as not to damage them in any
way during disassembly or reassembly.
1. Unscrew four (4) bolts, releasing (34) inlet body, two (20)
“O” rings, (32 and 39) lower seats, two (35) “O” rings and
two (21) balls.
2. Unscrew four (4) bolts, releasing (6) ball cap, two (15) “O”
rings, two (27) upper seats, two (28)“O”rings and two (14)
balls.
3. Unscrew (1) solvent cup, releasing (77) bushing, (44)
washer, (50) washer, five (51 and 52) “V” packings, (53)
washer and (43) wave spring.
4. Unscrew (2) gland nut, releasing (38) “O”ring.
5. Unscrew three (12) tie rod nuts and pull (11) upper body
from pump.
6. Remove two (17) downtubes and four (16) seals.
7. Remove (9) tube and two (7) “O”rings.
8. Pull (26) pump rod assembly from (9) tube.
9. Remove (31) cotter pin and unscrew (30) nut, releasing
two (29) followers and two (65) cup packings.
10. Remove (40) roll pin and unscrew (37) adapter, where
applicable.
Figure 1
LOWER PUMP END DESCRIPTION CHART
6720 X - X X X
Cylinder Size
0 - 3”i.d.
1 - 3-1/2”i.d.
Packing Material
7 - Glass filled PTFE (upper)
Virgin PTFE (lower)
C - UHMW-PE (upper and lower)
F - UHMW-PE / Leather staggered (upper)
UHMW-PE (lower)
P - UHMW-PE / Glass filled PTFE staggered (upper)
UHMW-PE (lower)
R - Glass filled PTFE / UHMW-PE staggered (upper)
Virgin PTFE (lower)
Spring Arrangement
4 - Multiple wave spring
LOWER PUMP END REASSEMBLY
NOTE: Inspect and replace old parts with new parts as neces-
sary. Look for deep scratches on metallic surfaces. Replace all
“O” rings upon reassembly. Lubricate all threads upon reas-
sembly. Refer to sealant and torque notes on page 3.
1. Screw (37) adapter to (26) pump rod, securing with (40)
roll pin, where applicable.
Plunger Type
B - Hardened stainless steel with ceramic coating (use “B”for
service kit selection)
G - Hardened stainless steel with ceramic coating (large motors)
(use “C”for service kit selection)
Service Kit Selection
6720X - X X X
63731X - X 4 X
Packing
2. Assemble (29) followers into (65) cup packings. As-
semble to (26) pump rod, securing with (30) nut. NOTE:
EXAMPLE: Lower Pump End # 67200-F4B
Service Kit # 637317-F4B
Plunger
(continued on page 4)
INGERSOLL RAND COMPANY LTD
209 NORTH MAIN STREET – BRYAN, OHIO 43506
ꢀ (800) 495-0276 y FAX (800) 892-6276
© 2010
CCN 99745416
PARTS LIST / 6720X-XXX
29
ꢂꢄ
1
65
65
30
7
77
44
50
51
52
51
52
51
53
43
ꢂꢃ
4
5
6
29
31
ꢀꢁ
16
17
14
28
27
15
9
2
ꢀꢂ
38
11
12
10
7
16
21
ꢀꢂ
18
8
12
32
20
34
5
ꢀꢂ
26
35
ꢅ
39
26
4
ꢀꢂ
ASSEMBLY TORQUE REQUIREMENTS
)
(
NOTE: DO NOT OVERTIGHTEN COMPONENTS.
(2) gland nut, 100 ft lbs (135.6 Nm).
(4) bolts, 45 ft lbs (61.0 Nm).
(12) tie rod nuts, 60 ft lbs (81.3 Nm).
(30) hex slotted nut, 50 ft lbs (67.8 Nm) minimum.
LUBRICATION / SEALANTS
Keep solvent cup filled with a lubricant such as ARO Wet-
Sol “Plus” or equivalent.
c
Apply Vaseline® to threads when assembling.
Apply Lubriplate® Super FML-2 grease to threads.
Install with orifice toward the center of the pump.
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Figure 2
6720X-XXX (en)
Page 3 of 4
Assemble cup packings with lips facing away from each
other. Torque (30) nut to 50 ft lbs (67.8 Nm).
set upper seats on (11) upper body. Set (14) balls on (27)
upper seats. NOTE: Assemble upper seats with cham-
fered side up.
3. Assemble (31) cotter pin, securing (30) nut.
4. Slide (26) pump rod and (65) cup packings into (9) tube,
being careful not to damage the lips of cup packings.
NOTE: On models 6720X-F4X, thoroughly lubricate the
inside of (9) tube with a lubricant compatible with the
application, prior to assembly.
16. Assemble two (28) “O” rings to (6) ball cap and assemble
ball cap to (11) upper body, securing with four (5) lock
washers and four (4) bolts. NOTE: Torque (4) bolts to 45 ft
lbs (61.0 Nm).
17. Tighten (2) gland nut to 100 ft lbs (135.6 Nm).
5. Assemble two (16) seals to each (17) downtube, assem-
bling with large i.d. onto downtube.
6. Assemble two (17) downtubes to (18) lower body.
7. Assemble (7) “O”ring and (9) tube to (18) lower body.
8. Screw three (12) nuts onto top end of (10) tie rods and
screw tie rods into (11) upper body.
9. Assemble (38) “O” ring into (11) upper body, securing
with (2) gland nut.
10. Assemble (43) wave spring, (53) male washer, five (51
and 52) “V” packings, (50) female packing washer, (44)
washer and (77) bushing into (11) upper body and screw
(1) solvent cup loosely into (11) upper body, securing
packings.
11. Assemble (7) “O” ring into (11) upper body and assemble
(11) upper body to (9) tube, aligning three (10) tie rods
with (18) lower body.
12. Assemble three (8) lock washers and three (12) tie rod
nuts to (10) tie rods, tightening to 60 ft lbs (81.4 Nm).
13. Turn pump assembly upside down and assemble two
(21) balls, two (35) “O”rings, (32 and 39) seats (chamfered
side into lower body first) and two (20) “O” rings into (18)
lower body. Refer to figure 2, page 3, for the location of
(39) seat (with orifice).
TROUBLE SHOOTING
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).
The (21) ball may not be seating in the (32) lower seat
(see lower pump disassembly). Remove the ball from the
lower seat, clean and inspect the ball and seat area. If ball
or lower seat is damaged, replace.
Material on one stroke only (fast upstroke).
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The (21) ball may not be seating in the (39) lower seat (see
lower pump disassembly). Remove the ball from the low-
er seat, clean and inspect the ball and seat area. If ball or
lower seat is damaged, replace. Check for worn or dam-
aged seals. Replace the seals as necessary. Also, check for
a damaged orifice in (39) seat.
Material leakage out of the solvent cup or material
appears on the pump plunger rod.
14. Assemble (34) inlet body to (18) lower body, secur-
ing with four (5) lock washers and four (4) bolts. NOTE:
Torque (4) bolts to 45 ft lbs (61.0 Nm).
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 disas-
sembly). Replace the packings as necessary.
15. Assemble (15) “O” rings to groove in (27) upper seats and
PN 97999-788
Page 4 of 4
6720X-XXX (en)
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