Graco 334135B Piston/Cylinder Replacement Kit Installation, Disassemble Cylinder

Repair

Piston/Cylinder Replacement Kit Installation

NOTE: See Piston Package on page 20 and Nylon and UHMW Piston Replacement Kits on page 65 for kit numbers.

1

1 The arrow imprinted on the cylinder points toward the pump outlet.

Prepare Machine for Kit Installation

1.Drain the pump. Empty the tanks. Perform shots repeatedly until no material comes out of the dis- pense valve.

2.Relieve pressure. See Pressure Relief Procedure, page 33.

3.Shut down the machine. See Shutdown, page 34.

Disassemble Cylinder

4.Remove the four end cap screws.

5.Remove the pump end caps. Allow the cap to hang by the hose.

6.Remove the cylinder and o-rings from the pump housing.

7.Push the drive block forward until pistons are fully extended.

8.Use a wrench to prevent the pump shaft from rotat- ing and remove the piston screw.

9.Remove the piston and any front or rear washers from the pump shaft.

10.Clean and inspect the washers.

Install Cylinder

11.Install the new piston and any front or rear washers.

12.Install the piston screw.

NOTE: Tighten the piston screw until the screw stops rotating, then turn the screw an additional 1/8 turn.

13.Fully retract the piston.

14.Lubricate the new o-rings with high temperature grease (part 115982).

15.Insert the lubricated o-rings into the grooves of the pump housing and end caps.

16.Install the cylinder between the pump housing and end cap. See note in illustration.

17.Secure cylinder in place with the four end cap screws.

Prepare Machine for Operation

18.Fill tanks.

19.Perform several shots to fill the pump housing with new material.

20.Calibrate and phase the machine. See the operation manual referenced at the beginning of this manual for procedure.

46 334135B