Displacement Pump Repair - Graco Dyna-Star 236-753 Instructions And Parts List

Displacement Pump Repair

Intake Valve. See Fig 10.
1. If possible, flush the pump. Follow the Pressure
Relief Procedure Warning on page 9.
2. Unscrew the valve body (119). Remove the o–ring
(108), ball (106) and retainer (120).
3. Inspect the parts for wear or damage. If the ball is
nicked, replace it. Reassemble, using grease on
the male threads.
Displacement Pump. See Fig 10.
NOTE 4: Clean and inspect all parts for wear or damage
as you disassemble them. Replace parts as
needed. For the best results, always replace
all the o–rings and packings when you disas-
semble the pump. The parts list on page 19
gives the recommended parts to keep on
hand.
1. If possible, flush the pump. Follow the Pressure
Relief Procedure Warning on page 9.
2. Follow Disconnecting the Reciprocator and
Displacement Pump on page 9. Remove the in-
take valve.
3. 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 the part if needed.
4. Grease the new piston seal and install with the lips
facing up as shown in Fig 10.
5. Reconnect reciprocator and displacement pump
per steps 1 through 6 of
placing Throat Seals
Assembly after Re-
on page 11.
115
116
110
112
117
120
106
119
Fig.10
104
118
108 108