SB80 Work Platform - European 3-21
M
AINTENANCE
Section
3.18
3.18 C
YLINDER
R
EPAIR
Removal
1. Remove cylinder from machine.
NOTE: Refer to “Illustrated Parts Section” for
location of cylinder and list of parts which
secure cylinder.
NOTE: If necessary, refer to “Supporting Elevat-
ing Assembly” at the front of the Maintenance
Section.
2. Mark and disconnect hoses and IMMEDIATELY
cap the openings to prevent contamination.
Disassembly
1. Remove head from cylinder body.
2. Carefully slide rod assembly out of cylinder.
3. Remove seal kit components (wipers, rod seals,
o-rings and backup rings) from head and piston.
4. Inspect parts for scratches, pits or polishing.
Check seal grooves and sealing surfaces.
Scratches or pits deep enough to catch the fin-
gernail are unacceptable; replace the cylinder.
Polishing is a sign of uneven loading. When this
occurs, the surface should be checked for round-
ness. Cylinders not round within .,178 mm (.007”)
should be replaced.
Assembly
NOTE: Torque all hardware to torques listed (see
Table 3-2, page 28) unless otherwise specified.
NOTE: If part was originally Loctited in place,
clean parts using Loctite Primer and reapply
Loctite before reinstalling part.
1. Lubricate all components with clean hydraulic
fluid.
NOTE: To avoid cutting the seals, do not use
sharp edged tools during seal replacement.
After installing seals allow at least one hour for
the seals to elastically restore to their original
shape before assembling cylinder.
2. Install new seal kit components.
3. Lubricate rod wiper and seal with hydraulic fluid
and slide head onto rod.
4. Lubricate seals on piston and head.
5. Carefully slide rod assembly into cylinder.
6. Secure head into cylinder.
Installation
1. Installation is reverse of removal.
2. When cylinder installation is complete, carefully
remove elevating assembly support.
3. Slowly cycle cylinder several times to remove air
from the hydraulic system.
4. Check for proper cylinder operation. Check
hydraulic connections for leaks.
WARNING
!
!
Cylinders may be very heavy. Support heavy
cylinders before removing pins which secure
cylinder to machine.
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