Displacement Pump Repair - Graco Dyna-Star B Series Instructions Manual

Displacement Pump Repair

Intake Valve
Refer to F . 11 for the following instructions.
IG
1. If possible, flush the pump.
2. Relieve pressure. See Pressure Relief Procedure
on page 8.
3. Unscrew the valve body (119). Remove the o-ring
(108), ball (106), and retainer (120).
4. Inspect the parts for wear or damage. If the ball is
nicked, replace it. Reassemble, using grease on the
male threads.
Displacement Pump
Refer to F . 11 for the following instructions.
IG
NOTE: Clean and inspect all parts for wear or damage
as you disassemble them. Replace parts as needed. For
the best results always replace the o-rings and packings
when you disassemble the pump. The parts list on page
19 gives the recommended parts to keep on hand.
1. If possible, flush the pump.
2. Relieve pressure. See Pressure Relief Procedure
on page 8.
3. Follow Disconnecting the Reciprocator and Dis-
placement Pump on page 11. Remove the intake
valve.
4. Carefully inspect the smooth inner surface of the
cylinder (118) for scoring or irregular surfaces. Such
damage causes premature seal wear and leaking,
so replace parts as needed.
5. Grease the new piston seal and install with the lips
facing up. Place the washer (121) and ball (104) on
the piston.
6. Reconnect reciprocator and displacement pump per
steps 1 through 6 of Replacing Throat Seals on
page 11.
308390N
115
116
110
1
121
111
2
117
120
106
119
Lips face down.
1
Lips face up.
2
F . 11
IG
Repair
112
104
118
108
17