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3080488
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).