Snorkel UL25, Parts & Service Manual

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UL-25/32/40 Portable Personnel Lifts 2-11
Maintenance
Section
2.6
7. Remove the seal retainer, using the spanner wrench,
062521-010.
8. Clean all sealing surfaces with solvent. Inspect
cylinder rod for excessive wear, replace if necessary.
9. Remove all seals from seal retainer, rod end cap and
discard.
Note: Apply clean hydraulic fluid to new cylinder seal,
threads and all sliding surfaces prior to assembly. If
necessary, soften new seals with warm water (82°c
[180°F]) to aid in installation.
10. Twist the pressure seal into a 'C' shape and snap into
seal groove in seal retainer, making sure the lip of the
seal is facing inward.
11. Using the same method, install the rod wiper into the
seal retainer outer groove, making sure that the blade of
the seal is facing outward from the seal retainer.
12. Replace static seals in rod end cap and seal retainer by
streatching them into place. Be carefull not to cut the
seal during installation.
13. Install the seal retainer onto rod using a sharp blow
from a hard rubber mallet to overcome seal squeeze.
Slide seal retainer into place and tighten using the
spanner wrench.
14. Rod and rod end threads must be absoloutly clean.
Spray threads with Loctite
®
primer #7471, allow to
dry for five minutes. Coat threads liberally with
Loctite
®
#242. Thread rod end cap onto rod, tighten
using strap wrench to hold rod.
15. Push rod back into cylinder for reassembly.
16. Reconnect hydraulic line.
17. Remove nuts from tie rod ends and set the cylinder
mounting plate into place. Secure mounting plate with
fasteners.
18. Install tie rod nuts flush with tie rod ends, torque each
nut the exact number of turns used to remove it.
19. Reinstall retaining ring.
20. Using a suitable lifting device, raise the lift to its
normal vertical position.
22. Bleed air from cylinder by cycling the mast to full
extension several times. The cylinder is self bleeding;
air will be forced out of the cylinder during the lower-
ing cycle.
23. If necessary, remove pinch shield and check alignment
of cylinder within mast assembly by peering down the
mast with a flashlight. The cylinder may be moved
left or right by tightening one or the other of the tie
rod nuts.
If cylinder is not centered, mast may "hang"
when lowering.
Keep hands clear of the mast assembly when
the pinch shield is removed for inspection
purposes; pinching injury to hands may
result .
Never operate a machine with the pinch
shield removed, except for inspection.
Figure 2-8: lift Cylinder
1
2
3
A
B
C D
4
Seal Profiles
1. Rod End Cap
2. Seal Retainer
3. Cylinder Rod
4. Cylinder Body
Seal Kit
A. Static Seal #1
B. Rod Wiper
C. Pressure Seal
D. Static Seal #2