Graco 223646 important safety instructions Reassembly Refer to Fig, Service

Service

Reassembly (Refer to Fig. 4)

1.Install the bearing (23*) in the lower housing (25). Lubricate the seals (24*) with hydraulic oil. Install them in the lower housing (25) with the lips facing up toward the top of the motor.

2.Install the o-ring (21*) onto the lower housing (25).

3.Place the piston flats in a vise. Install the spring (26) inside the piston (30). The compression rings (32*) must be positioned with the joints about 180_ opposed. Be sure the o-ring (17*) is in place.

4.Install the piston stop (28) and locknut (27) on the trip rod. Torque the nut to 117–123 in-lb (13.2–13.9 N.m). Slide the trip rod (31) into the piston (30).

Apply thread sealant to the retainer (34) threads. With the piston flats in a vise, tighten the retainer until it is flush or below the piston surface. This is important to prevent the retainer from backing out during operation and damaging the motor.

NOTE: Set base (2) on workbench during reassembly.

5.Install the o-ring (33*) onto the cylinder (29). Install the cylinder (29) into the lower housing (25).

6.Install the trip rod and piston into the cylinder (29) and lower housing (25) so the piston is recessed at least 1 inch (25 mm) from the top of the cylinder.

7.If the bearing and guide (35) was removed, install it on the upper housing (53) with the three screws

(36)(apply thread sealant).

8.Hold the flats of the trip rod with an adjustable wrench and install the upper housing (53). The trip rod will protrude from the top.

9.Slide the lower trip rod guide (37) and spring (45) onto the trip rod. Install the spool (38) with the detent at the top. Install the top spring (45) and guide (37) on the trip rod. Install the top hex nut

(46).Torque the nut to 82–88 in-lb (9.3–9.9 N.m).

10.Remove the adjustable wrench. Seat the upper housing (53) onto the cylinder (29), so the tube fittings align with those on the lower housing (25).

Reinstall the hydraulic tube (4) and loosely tighten the compression nuts.

11.Replace the o-ring (49*) on the stop plug (48). Seat the plug into the upper housing (53).

12.Install the end cap (47), using thread sealant on the socket screws (51).

13.Lubricate the threads of the tie rods (57) and install them with lockwashers (52). If the crown nuts (44) were removed, reinstall them and torque them onto the rods to 70–80 ft-lb (95–108 N.m).

14.Torque tie rods into base, apply thread sealant to tie rod threads, then torque the tie rod nuts (19) to 70–80 ft–lb (95–108 N.m).

15.With the motor on its side, install one detent assembly: the ball (43), guide (42) with the con- cave surface toward the ball, spring (40*), o-ring

(41)and retaining plug (39). Torque the plug to 145–160 in-lb (16–18 N.m). Repeat for the other side of the motor.

16.Slide the drip cover (18) onto the piston (30) up to the o-ring (17). Install screw (20) into the piston. Attach the drip pan (16) to the base using screws

17.Snugly tighten the compression nuts on the hy- draulic tube (4) and torque to 60–80 ft-lb (81–108 N.m).

18.Install the motor on the displacement pump. Re- connect all fluid lines. Be sure the ground wire is connected before operating the pump.

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