Repair; Replacing The Throat Seals; Disconnecting Reciprocator And Displacement Pump And Replacing Throat Seals - Graco Dyna-Star B Series Instructions Manual

Repair

Replacing the Throat Seals

Refer to F . 4 for the following instructions.
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NOTE: Replace these seals if fluid leaks excessively
through the porous plug (107), see F
dure can be done without disassembling the entire
reciprocator.
1. Relieve the pressure. See Pressure Relief Proce-
dure on page 8.
2. Disconnect the reciprocator from the pump. See
Disconnecting Reciprocator and Displacement
Pump and Replacing Throat Seals section on page
11.
3. Remove the four capscrews (24) and washers (12)
from the bottom of the retainer housing (56). Tap the
retainer housing to loosen it and pull it off the bottom
cap (47).
4. Remove the seal (22) and sleeve bearing (34) from
the top of the retainer housing (56).
5. Lubricate the sleeve bearing (34) and install the seal
and sleeve bearing in the retainer housing (56) in
the order shown in F
6. Reassemble. Torque the capscrews (24) to 28-32
ft-lbs (38-43 N.m). Install the displacement pump.
Follow Step 22 on page 16.
12
24
1
1
Torque to 28–32 ft-lb (38–43 N m).
2
Lips face UP.
F . 4
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308390N
. 5. This proce-
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. 4.
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47
22
2
34
56
Disconnecting Reciprocator and
Displacement Pump and
Replacing Throat Seals
Keep the Hydraulic System Clean
It is essential to keep the hydraulic oil system clean
and free of contaminants to reduce the risk of damag-
ing the hydraulic reciprocator. Always install a plug in
each tube fitting and on each hose end whenever
fluid lines are disconnected to prevent contamination.
1. Flush the pump if possible and stop it with the piston
rod in the lowest position.
2. Relieve the pressure. See Pressure Relief Proce-
dure on page Pressure Relief Procedure 8.
3. Disconnect the outlet hose from the displacement
pump.
4. Slowly loosen the hydraulic hoses to the supply (26)
and return (25) fittings to relieve any pressure and
then remove the hose. Install plugs on the tube fit-
tings and in the hose ends. Check the o-ring (13) on
the fitting and replace if worn or damaged. See F
4 and the Parts Drawing on page 18.
5. Using a strap wrench on the pump cylinder (118)
screw it out of the base (115) and remove it.
6. Place the piston (117) in a vise and loosen the pis-
ton rod (116).
7. Remove bolts (105) and washers (103).
NOTE: Be care not to scratch the outside of the piston
rod.
8. Push the piston rod (116) up through the base (115)
and remove it.
9. Remove the throat seal (110).
NOTICE
Repair
.
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11