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Displacement Pump Service
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
Displacement Pump Repair
Before you start:
D To reduce down time, be sure you have all neces-
sary repair parts available. Recommended spare
parts are listed in the parts list with a check mark,
n
for example ( 61
)
D Repair kit 239734 is available. If you have a repair
kit, use all the new parts for the best results. Parts
included in the kit are marked with an dagger (
the throat seal parts or with a double dagger (}) for
the pump lower parts.
D The balls (59}) in the intake and piston valves
cannot be reseated on the hardened
seats (68).
D Whenever you replace the packings, also replace
the glands and bearing.
D 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
leaking. Check these parts by rubbing a finger on
the surface and by holding the parts up to the light
at a slight angle.
Disassembly
1. Flush the pump, if possible. Follow the Pressure
Relief Procedure on page 8. Disconnect all air
and fluid hoses.
2. Clamp the motor base in a vise. Unscrew the
priming cylinder (78).
3. Hold the priming tube (72) with a 1/4 in (6mm)
diameter rod through the holes in the tube. Grip
the flats of the priming piston (71) with a wrench,
and unscrew the piston.
4. Loosen the packing housing (70). Unscrew the
riser tube (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
unthread the connecting rod (79) from the motor
displacement rod.
5. 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.
6. Hold the intake valve housing (67) in a vise, and
unscrew the priming tube (72) by inserting a 1/4 in
(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.
7. Unscrew the piston valve housing (64) from the
intake valve housing (67). Remove the ball and
packings.
8. Clean all parts thoroughly. Grease all parts,
except threads when reassembling.
{
) for
Reassembly
1. Hold the intake housing (67) upright in a vise. One
at a time, place the female gland (74}), four leath-
er v-packings (66}) with the lips of the packings
facing up, and the male gland (65}) on the intake
housing. Place the gasket (62}), seat (68), and
ball (59}) on the housing (67).
2. If the pins (77) were removed from the piston valve
housing (64), replace them. Screw the piston
valve onto the intake valve housing.
3. Place a gasket (62}), seat (68) and ball (59}) on
the priming tube (72). Holding the piston valve
housing (67) with a wrench, screw the priming tube
into it, using a 1/4 in. diameter rod through the
tube for leverage.
4. One at a time, place the female gland (76}), four
leather v-packings (73}) with lips of packings
facing up, a male gland (75}), and a bearing (69})
in the packing housing (70). Screw the housing
firmly into the riser tube (80).
5. Guide the piston assembly into the riser tube (80).
Screw the riser tube into the motor base, making
sure the gasket 63) is in place. Install the cotter
pin (60}). Torque the riser tube to 50 to 70 ft-lb
(68 to 95 NSm).
6. Screw the priming piston (71) firmly onto the
priming tube (72). Screw the intake cylinder (78)
firmly onto the riser tube.
7. Reconnect the ground wire if it was disconnected
during repair.
308777H
11
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