Repair
312793L
13
Complete Pump Repair
Disassembly
1.
Follow all steps under Preparation, page 10.
2.
Use a socket to remove the foot cap (42). Remove
and discard the o-ring (41).
3.
Use a 5 mm hex wrench to loosen the three screws
(10) on the top cap. Lift the air motor shaft to
remove the top cap (8) and the shield mount spacer
(9) from the bellows chamber.
4.
Hold the hex on the connecting rod (14) with a 19
mm (3/4 in.) wrench so it cannot turn. Use a socket
to loosen the piston/rod assembly. See F
5.
Pull the piston/rod assembly out of the bottom of the
cylinder (27).
6.
V-Packing Models: Remove the piston packings
(37, 39), glands (38, 40), and spring (35). See F
IG
.
14, page 16.
7.
U-Cup Models: Remove the bearing (52), u-cup
(53), and washer (54). See F
IG
. 13, page 15.
8.
Models with overflow chamber: If overflow cham-
ber needs to be replaced, see Replace the Bel-
lows, page 11. If overflow chamber is fine, leave it
attached to the top cap.
9.
Remove the connecting rod (14) and bellows (7).
10. Use a 5 mm allen wrench to remove the three
screws (17) and washers (18), then remove the bel-
lows chamber (1). Remove and discard the bellows
chamber o-ring (12).
11. Use a 54 mm (2 1/8 in.) socket wrench to remove
the packing nut (20).
12. V-Packing Models: Remove the glands (23, 26),
throat packings (24, 25), and spring (22). See F
13. U-Cup Models: Use an o-ring pick or pliers to
remove the spring clip (51), the u-cup (50), and the
bearing (49). F
14. Remove and discard the packing nut top o-ring (2)
and bottom o-ring (21).
15. Put the hex of the piston rod (31) in a vise. Use a
1/2 in. hex wrench to remove the flow-through nut
(44) from the bottom of the piston (45).
16. Remove the o-ring (32) and seat (46). Remove from
vise and tip out the check ball (47).
F
IG
. 7. Outlet check.
44
32
46
47
1
2
45
31
Apply lubricant.
1
Torque to 74-86 ft-lb
(100-117 N•m).
2
ti15410a
1/2 in. hex
1
Summary of Contents for Merkur Bellows
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