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30804810
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
(12).
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.