Graco 223646 important safety instructions Disassembly continued - refer to Fig, Service

Service

Disassembly (continued – refer to Fig. 3)

NOTICE

When removing the displacement pump, hold it securely. The pump is heavy and could fall off the motor.

5.Disconnect the displacement pump from the motor, as explained in your separate pump manu- al.

6.Place the hydraulic motor in a bench vise.

7.Push or lightly tap the piston (30) up as far as possible.

NOTE: The tie rod nuts (19), socket screws (51), cap screws (36), and retainer (34) are fastened with Loc- titer TL–242. Heat may be used sparingly to soften adhesive sealant during disassembly.

8.Remove the cap screws (12), the drip pan (16), the drip cover (18), and machine screw (20) before loosening the tie rod nuts. Then remove the four tie rod nuts (19). Loosen the nuts (B) on the hy- draulic tube (4) and loosen the tie rods (57).

9.Remove the motor from the vise and lay it in a pan.

10.Remove one detent assembly: retaining plug (39), o-ring (41), spring (40), ball guide (42) and ball (43). If the ball or other parts stick in the upper housing (53), turn the motor over and tap lightly. Do not allow the parts to fall into the motor. Repeat the procedure for the other detent assembly.

11.Remove the tie rods (57), but do not remove the crown nuts (44).

12.Remove the socket screws (51) and the end cap (47). Pull the stop plug (48) from the upper hous- ing (53).

13.Unscrew the top and bottom compression nuts (B) on the hydraulic tube (4). Rotate the upper housing (53) and remove the tube, being careful not to damage the flare (A). Allow the oil to drain from the motor into the pan.

NOTE: With the tie rods removed, the assembly may separate at the joints between the cylinder (29) and the upper and lower housings (53 and 25).

14.Rock the upper housing (53) to work it free and lift it about 3 inches off the cylinder (29). The cylin- der can stay in the lower housing (25).

15.Hold the trip rod (31) with an adjustable wrench on the flats of the rod, and remove the top hex nut

(46)from the trip rod.

16.Remove the upper housing (53).

17.Remove the trip rod guides (37), compression springs (45) and valve spool (38) from the upper housing. Inspect the bearing inside of the guide

(35)in place. If bearing is damaged replace item

35.

NOTE: Inspect the trip rod (31) above the shoulder for damage. There must be no reduction in diameter. Replace if necessary.

18.Pull the trip rod and piston from the lower housing

(25)and cylinder (29). Place the piston flats (30) in a vise; tighten the vise on the flats of the piston. Use a face spanner to remove the retainer (34). Remove the trip rod (31) from the piston (30).

19.Remove the trip rod locknut (27) and piston stop

(28).If the piston is replaced, remove the spring

(26)to use in the new piston.

20.Remove the bearing (23), packings (24), and o-ring (21).

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