Graco Inc Models 965766, 965767, 965768, and 965786 only Reassembly, Air Cylinder Section

Service

(Models 965766, 965767, 965768, and 965786 only)

Reassembly

Air Cylinder Section

1.Lubricate the shaft o-rings (4) and the bearings (5) with grease supplied in the repair kit. Insert o-rings into the air cylinder (1) and air cap (11) cavities.

See Fig. 5.

2.Press the bearings (5) flush into the air cylinder housing and air cap, trapping the o-rings (4).

3.Lubricate and reassemble the piston assembly; piston (10), o-ring (9), dowel pin (7), adjustment shaft (42), o-ring (6), and shaft (3). Use Loctiter Primer N7649 and Loctiter TL242, 243, or equivalent (“blue” Loctite) when assembling the adjustment shaft (42). Tighten the shaft to 15–20 in–lb (1.7–2.2 NSm). The shaft (3) should hang with some play to be self-aligning in the bearing.

4.Lubricate the air cylinder (1) ID with the grease supplied. Push the piston (10) assembly into the air cylinder.

5.Orient the air inlet manifold (2) (if used) as shown. Match the gasket openings to the air ports.

Fluid Section

1.Lubricate the bearing (21), o-ring (16) and cup seal

(20).Put the o-ring (16) on the bearing. Carefully insert the seal (20) into the bearing recess, with the lips of the o-ring facing into the bearing. Be careful not to damage the seal lips.

2.Push the bearing (21) seal end first into the housing (19). Be sure that the grease hole in the side of the bearing lines up with the grease ports in the housing (19).

3.Holding the bearing (21) in place, push the bearing assembly over the shaft (3).

4.Lubricate the main fluid seal (22) and its cavity in the housing (26). Carefully press the seal, lip-first, into the housing.

5.Push the housing (26) and seal (22) over the shaft

(3)and up against the bearing housing.

6.Apply anti–seize lubricant (Loctite 56765 or equivalent) to the fluid housing screws (23) and loosely install the screws to retain the housings. Do not tighten the screws yet.

7.Insert the gasket (38) and seat (25). These items are reversible and can be installed in either direction.

8.Use Loctite Primer N7649 and Loctite TL242, 243, or equivalent (“blue” Loctite) when assembling the needle (27) and tighten to 15–20 in–lb (1.7–2.2 NSm).

9.Apply air pressure to the CLOSE port, or to the pneumatic trigger valve if installed. This will align the shaft, seal, and bearing. Tighten the fluid housing screws (23) oppositely and evenly to 40–45 in-lbs (4.5–5 NSm).

10.Install the nosepiece (40) with the PTFE o-ring (39), screw (15), and snuff-back ring (41), if used. The snuff-back ring has an internal bevel on one end which faces into the nosepiece. Tighten the nosepiece screws to 15–20 in-lbs (1.7–2.2 NSm).

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