Page 3-18
Maintenance 3.11 - Cylinder Repair
TM12 Work Platform - European
3.11 C
YLINDER
R
EPAIR
R
EMOVAL
NOTE: Refer to “Illustrated Parts Section” for location of cylinder and list of parts which secure cylinder.
1. Remove cylinder from machine.
2. Mark and disconnect hoses and IMMEDIATELY cap the openings to prevent contamination.
D
ISASSEMBLY
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 fingernail are unacceptable; replace the cylin-
der. Polishing is a sign of uneven loading. when this occurs, the surface should be checked
for roundness. Cylinders not round within 0,18 mm (.007”) should be replaced.
A
SSEMBLY
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.
•Torque all hardware to torques according to Table 3-1, “Torque Specifications for Hydraulic
Components,” on Page 3-32 unless otherwise specified.
1. Lubricate all components with clean hydraulic fluid.
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.
I
NSTALLATION
1. Installation is reverse of removal.
2. 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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