Service - Graco Series B Instructions-Parts List Manual

Before you start:
A. Repair kit 207–848 includes parts to repair both the
displacement pump and the air motor. (Refer to man-
ual 307–851 for air motor repair instructions.) For the
best results, use all the new parts in the kit, even if the
old ones look good. Parts included in the kit are
marked with an asterisk, for example (5*).
B. Use a compatible solvent to clean parts. Inspect
parts for wear or damage and replace as needed.
Scoring or irregular surfaces on the displacement
rod (17) or polished inner wall of the cylinder (16)
cause premature packing wear and leaking. Check
these parts by rubbing a finger on the surface or by
holding the parts up to a light at a slight angle.
C. To remove the pump from the drum cover, remove
the two nuts (126) and washers (122) holding the
pump to the cover, and remove the pump.
WARNING
Before servicing any part of the system, follow the
Pressure Relief Procedure Warning on page 8.
Displacement Pump Repair
Intake Valve (See Fig 2)
1. Unscrew the intake valve housing (15) and remove
all parts.
2. Clean and inspect the parts.
3. To reseat the ball (6*), hold it against the seat in the
housing (15) with a brass rod and tap it lightly with a
hammer.
4. Install the ball stop (14). Apply thread sealant to the
housing (15) and screw it onto the cylinder (16).

SERVICE

Piston (See Fig 2)
1. Remove the intake valve housing (15), then unscrew
the cylinder (16) from the outlet housing (19) and pull
the cylinder down to expose the piston.
2. Unscrew the piston stud (13) from the displacement
rod (17) and remove all parts.
3. Clean and inspect the parts.
4. To seat the ball (5*), hold it against the seat of the pis-
ton stud (13) with a brass rod and lightly tap it with a
hammer.
5. Place a washer (11), leather u–cup packing (7*),
spacer (10), leather u–cup packing (7*), and washer
(11) on the piston stud (13). Apply thread sealant to
the piston threads. Screw the piston assembly, with
the ball in place, into the displacement rod (17).
Torque to 20–30 ft–lb (27–47 N.m).
Throat Packings (See Fig 2)
1. Remove the lower locknut and washer (68, 59) from
the return tube (67). Unscrew the swivel (64) from the
supply tube (66). Remove the cotter pin (61*) from
the connecting rod (71). Screw the connecting rod
out of the displacement rod (17).
2. Remove the intake valve assembly and unscrew the
cylinder (16) from the outlet housing (19).
3. Unscrew the packing nut (12). Pull out the displace-
ment rod (17); if it is stuck, soak it in solvent until loos-
ened. Remove the throat packings.
4. Clean and inspect all parts. Grease the parts, then
install the o–ring (18), u–cup packing (9) so the lips of
the packing face down into the outlet housing (19),
and the bearing (8). Loosely install the packing nut
(12). Grease the displacement rod well and slide it up
into the throat. Grease the piston (13) and install the
cylinder (16), screwing it tightly into the outlet hous-
ing (19).
5. Check that the o–ring (72*) is in place on the connect-
ing rod (71). Align the displacement pump with the
tubes (66, 67). Screw the connecting rod (71) into the
displacement rod (17) and install the cotter pin (61*)
through the rods. Secure the swivel (64) to the supply
tube (66). Screw the upper locknut (68), with lock-
washer (59), down to the outlet housing (19). Install
the lower lockwasher (59) and locknut (68) on the re-
turn tube (67) and tighten firmly.
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