Graco SaniForce 3A5402, Repair Parts

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Air Cylinder Repair
Reassemble Reassemble Reassemble Air Air Air Cylinder Cylinder Cylinder Cap Cap Cap and and and
Unloader Unloader Unloader
NOTE: NOTE: NOTE: After o-rings are inserted into their grooves,
lightly grease the exposed o-ring surfaces with
food-safe grease to aid assembly with mating parts.
1. Assemble the piston assembly:
a. On piston (10), install inner packing (11) and
outer packing (12).
b. Install piston sleeve (13) onto piston (10).
c. Install retainer (14) on piston.
d. Install o-ring (8) on piston sleeve (13).
2. Mount piston assembly on piston rod:
NOTE: NOTE:
NOTE: The o-ring inside the piston can be
damaged when passing by the retainer groove.
Gently rotating the piston as it passes the retainer
groove can lower the chance of the o-ring being
trapped in the groove.
a. On piston rod (2), install retainer (9) in the
second groove from the bottom of the piston
rod.
b. Install the spacer (15) on piston rod.
c. Install piston assembly, largest diameter side
first, on piston rod. Position against retainer
in piston rod.
d. Install retainer into lower piston rod groove,
trapping the piston on the piston rod.
3. From the threaded end of the piston rod, install
the spacer (15).
4. Assemble the cap assembly:
a. Install inner o-ring (7) and outer o-ring (8) on
the cap (3).
b. Install o-ring (6) in bushing (4).
c. From the side of the cap with the bolt flange,
insert bushing into cap.
d. From the smaller diameter side of the cap,
install bushing retainer (5) on the bushing.
5. Apply a thorough coating of food-grade lubricant
to the inner surface of the air cylinder as far down
a reachable by hand, and apply to the outer
surfaces of the piston assembly.
6. Leaving a couple of sections of the piston shaft
free of lubricant, to aid gripping during insertion,
apply food-grade lubricant on all remaining
portions of the piston rod and to the inside
surfaces of the cap.
7. Install the cap assembly onto the piston rod,
oriented so the cap mounting flange is furthest
away from the piston assembly and slide it down
to rest on the piston.
8. Insert the piston assembly into the air cylinder,
making sure to align the cap with the air cylinder
opening. Lower the piston and rod into the air
cylinder until it comes to rest at the bottom of the
air cylinder.
9. Install screws (28) and washers (27) in the cap
mounting holes.
10. Attach the air lines to the top and bottom air
fittings on the completed air cylinder.
11. Repeat for the other air cylinder.
12. Using nuts (24) and washers (23), attach the ram
crossbar (116) to the air cylinder piston rods (2),
pump support rods (17), and air motor support
rod (107).
10 3A5404F