Graco 239729 User Manual
Repair
308777L
9
Repair
Refer to F
. 3 for the following instructions.
Displacement Pump Repair
Before you start:
•
To reduce downtime, be sure to have all necessary
repair parts available. Recommended spare parts
are listed in the parts list.
repair parts available. Recommended spare parts
are listed in the parts list.
•
Repair kit 239734 is available. Use all new parts for
best results.
best results.
•
The balls (59) in the intake and piston valves cannot
be re-seated on the hardened seats (68).
be re-seated on the hardened seats (68).
•
Whenever replacing the packings, also replace the
glands and bearings.
glands and bearings.
•
When cleaning parts, use a compatible solvent.
Inspect parts for wear or damage and replace as
necessary. Scoring or irregular surfaces on the
priming tube (72) or polished inner wall of the riser
tube (80) causes premature packing wear and leak-
ing. Check these parts by holding the parts up to the
light at a slight angle.
Inspect parts for wear or damage and replace as
necessary. Scoring or irregular surfaces on the
priming tube (72) or polished inner wall of the riser
tube (80) causes premature packing wear and leak-
ing. Check these parts by holding the parts up to the
light at a slight angle.
Disassembly
1.
Flush the pump if possible.
2.
Relieve the pressure, see page 7.
3.
Disconnect all air and fluid hoses.
4.
Clamp the motor base in a vise. Unscrew the prim-
ing cylinder (78).
ing cylinder (78).
5.
Hold the priming tube (72) with a 1/4 inch (6 mm)
diameter rod through the holes in the tube. Grip the
flats of the priming piston (71) with a wrench, and
unscrew the piston.
diameter rod through the holes in the tube. Grip the
flats of the priming piston (71) with a wrench, and
unscrew the piston.
6.
Loosen the packing housing (70). Unscrew the riser
tub e(80) from the air motor. Pull the riser tube and
connecting rod down to gain access to the cotter pin
(60). Remove the cotter pin, and un-thread the con-
necting rod (79) from the motor displacement rod.
tub e(80) from the air motor. Pull the riser tube and
connecting rod down to gain access to the cotter pin
(60). Remove the cotter pin, and un-thread the con-
necting rod (79) from the motor displacement rod.
7.
Place the riser tube (80) in a vise, and remove the
piston assembly. Remove the packing housing (70)
from the riser tube, and remove the packings from
the housing.
piston assembly. Remove the packing housing (70)
from the riser tube, and remove the packings from
the housing.
8.
Hold the intake valve housing (67) in a vise, and
unscrew the priming tube *72) by inserting a 1/4
inch (6 mm) diameter rod through the holes in the
tube. Handle the tube carefully to avoid marring the
surface. Remove the ball, seat, and gasket.
unscrew the priming tube *72) by inserting a 1/4
inch (6 mm) diameter rod through the holes in the
tube. Handle the tube carefully to avoid marring the
surface. Remove the ball, seat, and gasket.
9.
Unscrew the piston valve housing (64) from the
intake valve housing (67). Remove the ball and
packings.
intake valve housing (67). Remove the ball and
packings.
10. Clean all parts thoroughly. Grease all parts, except
threads when reassembling.
F
IG
. 3
79
64
68
65
74
59
75
76
70
78
73
1
69
72
80
2
66
77
62
61
67
62
68
06336
72
1/4” ROD
71
Ref. No. 63 (copper gasket) and
Ref. No. 60 (cotter pin), see
Parts Drawing on page 16.
Ref. No. 60 (cotter pin), see
Parts Drawing on page 16.
1
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