Graco 24H853, Repair Instructions

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Instructions
3A1494D 7
5. Install o-ring (55) in groove on the end of the dis-
placement rod (30) (Fig. 12).
6. Push the air piston (21) over the end of the displace-
ment rod (30). Apply Loctite® 262 to the bolt (18)
shoulder. Install the washer (19) and bolt (18). Hold
the displacement rod (30) with an adjustable wrench
and use an 8mm hex wrench to tighten the bolt
securely. Torque bolt to 155 - 160 in. pounds (17.5 -
18.0 N.m) (Fig. 13).
NOTE: Loctite ® is a registered trademark of the Loctite
Corporation.
7. Install new o-ring around air piston (21), and pump
piston (33) as described in the Throat and Piston
Seal Replacement Kit 24H853, page 9. Be sure to
apply a thin coat of water-resistant grease to all
o-rings and seals.
8. Slide air cylinder (27) over the bottom cover (26)
(Fig. 14).
9. Remove the assembly from the vise and place the
top of the air cylinder down on a clean hard surface.
Use the palms of your hands to press the bottom
cover (26) firmly into the air cylinder (27) as shown
in Fig. 15.
10. Secure assembly in vise as shown in Fig. 16. Install
5 screws (4) wrench tight only.
NOTE: If installing a new air cylinder (27) the mating
holes are not threaded by design. Use thread form-
ing screws (4) to form threads as they are being
installed. Torque to 95-105 in.-lbs (10.7 to 11.8 N.m)
to ensure full thread formation.
11. To ensure there is a proper seal between the air
valve and manifold, loosen all 5 screws (4) approxi-
mately 1/4 turn Fig. 16). These screws will be
torqued
AFTER the air valve is installed (38) (Step
Fig. 12
Fig. 13
30
55
21
19
18
Fig. 14
Fig. 15
26
27
21
26
27