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Service
Hydraulic Motor Reassembly
1. Install the block packing (14*) and wiper (15*) in the
housing retainer (36). The spring of the block pack-
ing and the lips of the wiper must face up. Install the
o-ring (2*) on the top surface of the retainer. See
F
. 2.
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2. Install the bearing (13*) and block packing (49*) in
the bottom cylinder cap (35). The lips of the block
packing must face up.
3. Reassemble the housing retainer (36) and the bot-
tom cylinder cap (35).
4. To reassemble the yoke (4) and trip rod (17), clean
the threads with primer or chlorinated solvent and
let dry for 3 to 4 minutes. Apply thread sealant to the
female threads of the yoke. Slide the yoke into
Repair Tool 189-305 and place the tool in a vise.
Using a wrench on the flats of the trip rod, screw the
rod into the yoke. Torque to 54 to 56 in-lb (6.1 to 6.3
N•m).
5. Install the bearing (5*), o-ring (7*), and seal (6*) on
the piston (16). Install the second o-ring (8*) on the
underside of the piston. Slide the piston onto the trip
rod (17) so the wide end of the piston faces the yoke
(4).
6. Install the retainers (11) and spring (12*) on the trip
rod (17). Thread the nut (48*) onto the rod until it
runs out of thread, so that it bottoms out on the
shoulder of the rod. See the Detail in F
7. Hold the flats of the displacement rod (9) in a vise.
Slide the trip rod (17) into the displacement rod. Use
a spanner wrench in the pin holes of the piston (16)
to screw it into the displacement rod. Torque to 30 to
40 ft-lb (41 to 54 N•m).
8. Install the o-ring (20*) in the top cylinder cap (1),
then install the cap plate (29), o-ring (24*), sealing
washer (22), and capscrew (23).
9. To reassemble the valve sleeve (19) and valve stop
(25), slide the sleeve (19) onto the valve spool (S).
(Either side of the sleeve can face up.) Apply primer
to the threads of the screws (26) and let dry for 3 to
4 minutes. Apply 1 or 2 drops of thread sealant to
the female threads of the spool (S). Install the stop
(25) and torque the screws (26) to 42 to 45 in-lb (4.7
to 5.1 N•m).
10
10. To assemble the valve mechanism, use Repair Tool
189305 as follows:
a. Slide the yoke (4) into the repair tool, as shown
b. Insert the spring (18*) and one ball (3*) into the
c. Place the second ball (3*) at the other end of
d. Align the curved ends of the yoke with the valve
11. Place the bottom cylinder cap (35) in a vise. Install
the o-ring (2*) in the cap. Set the cylinder (33) on
the bottom cap.
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12. Install the o-ring (2*) in the top valve spool (1). Make
sure the hydraulic fittings (31, 34, and 38) are ori-
ented as shown in F
ment rod (9) and piston (16) into the cylinder (33)
until it seats in the top cap.
When inserting the piston into the cylinder, carefully
guide the piston seal (6*) and bearing (5*) to pre-
vent damage to these parts.
13. Install the tie rods (37). If the nuts and washers were
removed, screw them onto the ends with short
threads.
14. Remove the plugs from the fluid fittings (31, 34, and
38). Install the tubes (32, 39) and tighten the four
fluid tube nuts (N).
15. Install the hydraulic motor on the pump as explained
in the separate system manual.
in the Detail in F
. 2. Align the upper detent
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holes (H) of the yoke with the center line of the
tool.
valve stop (25). Tilt the valve stop and start
guiding it into the tool, making sure the ball is
sliding into the rounded slot in the tool.
the spring (18*) and push it in with your thumb
while rotating the valve stop (25) until the spring
is horizontal and the balls are in place. Continue
holding this assembly together.
sleeve groove, then press the assemblies firmly
together. Make sure the balls snap into the
upper detent holes (H) of the yoke (4), and the
curved ends of the yoke engage the valve
sleeve (19) groove. To remove the tool, slide it
over the trip rod (17).
. 1, then slide the displace-
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NOTICE
312484B
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