Graco 312348B Piston Kit Installation, U-Cup Orientation, Piston Head and Rod, Pump

Piston Kit Installation

1.Install piston rod seal; ensure u-cup faces piston rod as shown in FIG. 5.

Assemble back plate with the small bore facing the seal.

TI9097a

FIG. 5: U-Cup Orientation

2.Assemble piston head to piston rod. Apply Loctite to threads and torque piston head according to Table 1.

1

TI9098a

1 Apply Loctite to threads.

FIG. 6: Piston Head and Rod

Pump	Torque (ft-lbs)
28	10
40	22
44	22
48	22
60	38
80	38
96	38
104	38
120	55

Table 1: Torque Specification

3.Press throat seal into block using back plate and supplied screws. Ensure u-cup faces cylinder.

TI9099a

FIG. 7: Seal Orientation

4.Ensure plate is parallel with block. Carefully tighten screws until plate is flush with block. Be sure to press seal straight into bore.

TI9109a	TI9111a
Seal Alignment	Pressed Seal
FIG. 8: Seal Alignment

312348B 5