Manitowoc Grove CD3340B Service Manual page 289

CD3340B/YB4411
Assembly
1. Install rod seal (11, Figure 10-23) in the bore of the
cylinder head. Install wiper seal (12) in the front groove
in the bore of the cylinder head. The lip of the wiper must
be toward the outside of the cylinder. Install O-ring (9)
and backup ring (10) in the groove on the outside of the
head. The backup ring must be toward the outside of
cylinder.
2. Apply petroleum jelly to the rod seal and wiper. Carefully
slide the cylinder head assembly over the piston end of
rod (13). Do not try to install the head over the threaded
end of the rod. Damage can be caused to the wiper and
rod seal by the threads.
3. Install O-ring (7) on piston rod (13). Be careful not to
damage the O-ring on the threads.
4. Install piston (3) on piston rod (13) with the wear ring
groove towards the rear.
5. Install piston nut (2) and tighten to a torque of 100 lb-ft
(136 Nm).
6. Install split piston ring (4). Install O-ring (5) and seal (6)
to piston (3).
7. Apply petroleum jelly to the cylinder tube threads and to
the O-ring and seal on the piston. Carefully, slide the
assembled piston rod into the cylinder tube. Use care to
prevent damage to the piston ring and seals during
installation. Work the piston rod straight into the cylinder
tube.
8. Lubricate O-ring (9) on the outside of cylinder head (8).
Slide the cylinder head into the cylinder tube and
engage the cylinder head threads. Tighten the cylinder
head with the spanner wrench until contact is made
between the cylinder head flange and the cylinder tube.
Continue to tighten the cylinder head until all turning
movement stops and the cylinder head is secure.
9. Test the cylinder before installation.
Test
1. Use an external pump to test the cylinder.
2. Fill the cylinder with clean hydraulic oil. To test the piston
seal ring, continue to push oil into the rod end after the
cylinder has hit bottom. Test at a pressure of 24132 kPa
(3500 psi) in both directions.
3. Move the cylinder rod through two complete cycles at
800 psi (5510 kPa) to remove air from the cylinder. Look
for external leaks. If the pressure differences between
the cylinder ports is more than 689 kPa (100 psi) during
the second stroke, the cylinder assembly is not
acceptable. Disassemble and inspect for foreign
materials or wrong assembly.
GROVE
4. Wipe the cylinder rod clean. Then move the cylinder
through four complete strokes at 5510 kPa (800 psi), but
do not permit the cylinder to hit bottom on each stroke.
After four strokes, extend the cylinder rod just far
enough to see how much oil has collected on the rod
during the four strokes. A thin layer of oil on the cylinder
rod is normal. Excessive oil indicates rod seal leakage.
Inspect and replace the seal.
5. Fully retract the cylinder rod. Keep the base port open.
Apply a test pressure of 24132 kPa (3500 psi) to the rod
port. Hold this pressure for a minimum of 10 seconds.
Visually check for internal and external leakage. No
leakage is permitted.
6. Fully extend the cylinder rod. Keep the rod port open.
Apply a test pressure of 24132 kPa (3500 psi) to the
base port. Hold this pressure for a minimum of 10
seconds. Visually check for internal and external
leakage. No leakage is permitted.
7. Plug both ports to keep contamination out of the cylinder
during installation.
8. If the ball joints were removed, install them to the
cylinder ends. Turn the ball joint onto the threads 18
turns. Be sure to locate the ball joints as illustrated in
Figure 10-24. Then measure the distance from center of
one grease fitting to the center of other grease fitting.
The dimension should be 504.8 mm (19-7/8 in).
a0669
Installation
1. Be sure the ball joints are installed to the correct
dimension.
2. Install the cylinder with the cylinder ports facing out.
Tighten each castle nut and install the cotter pin.
3. Connect the hydraulic hoses to the cylinder ports. Make
sure they are tight.
4. Lubricate the grease fittings with Lithium based, E.P. No.
2 bearing grease.
5. Check the hydraulic oil level and add oil if necessary.
Published 04/07/2015 Control # 569-00
STEERING SYSTEM
FIGURE 10-24
10-19
10