HYDRAULIC SYSTEM RT530E-2 SERVICE MANUAL
2-60 Published 4-22-15, Control # 556-00
DUAL ROD TELESCOPE CYLINDER
Description
The boom dual rod telescope cylinder has a 16.0 cm (6.31
inch) bore. The cylinder is internally ported (rod ported). Oil
from the telescope control valve is routed to the cylinder by
external lines. Foreign material is prevented from entering
the cylinder rod during retraction by a wiper ring in the head.
O-ring seals prevent internal and external leakage
(Figure 2-31).
The cylinder incorporates two cylinder rods with separate
strokes. One rod has a stroke of 674.8 cm (265.7 in), and
one rod has a stroke of 687.7 cm (270.75 in), which provides
a combined overall stroke of 1362.7 cm (536.5 in).
The cylinder weighs approximately 907 kg (1995.5 lb) wet.
Maintenance
Disassembly
NOTE: Any maintenance requiring disassembly of the
cylinder should include replacement of all cylinder
seals and O-rings.
1. Using a spanner wrench, unscrew the outer cylinder
head from the cylinder barrel.
2. Remove the cylinder rod assembly from the cylinder
barrel and cover the barrel to avoid contamination.
NOTE: Aligning discarded seals and rings in the order of
disassembly will facilitate installation of new seals
and rings.
3. Remove the hydrolock piston seal to gain access to the
setscrew securing the piston to the outer cylinder rod.
4. Remove the setscrew and unscrew the piston from the
cylinder rod.
5. Remove the remaining hydrolock seal and wear ring
from the outside of the piston and the O-ring and two
backup rings from the inside of the piston.
6. Remove the spacer from the rod.
7. Remove the O-ring from the rod.
8. Remove the cylinder head from the outer rod.
9. Remove the O-ring and backup ring from the outside of
the head and the wear ring, buffer seal, rod seal and
wiper ring from the inside of the head.
10. Using a spanner wrench, unscrew the inner cylinder
head from the outer cylinder rod.
11. Remove the inner cylinder rod assembly from the outer
cylinder rod and cover the opening to avoid
contamination.
12. Remove the hydrolock piston seal to gain access to the
setscrew securing the piston to the inner cylinder rod.
13. Remove the setscrew and unscrew the piston from the
cylinder rod.
14. Remove the remaining hydrolock seal from the outside
of the piston and the O-ring and two backup rings from
the cylinder rod.
15. Remove the O-ring from the rod.
16. Remove the spacer from the rod and remove the wear
ring from the spacer.
17. Remove the cylinder head from the inner rod.
18. Remove the O-ring and backup ring from the outside of
the head and the wear rings, buffer seal, rod seal and
wiper ring from the inside of the head.
19. If necessary, remove the socket head capscrews and
remove the counterbalance valve.
CAUTION
Do not retract the cylinder completely if it is not attached
to the boom. Maintain a spacer that is split or hinged 6.88”
long to prevent cylinder from retracting completely.
DANGER
Do not use air pressure to remove the cylinder rod
assembly. Use only a source of controlled hydraulic oil
pressure if the rod is hard to remove.
CAUTION
Exercise extreme care when handling or setting down the
cylinder rod. Do not damage the chrome surface.
CAUTION
When removing seals and rings, avoid scratching
grooved and gland surfaces.
CAUTION
Do not use air pressure to remove the cylinder rod
assembly. Use only a source of controlled hydraulic oil
pressure if the rod is hard to remove.
CAUTION
Exercise extreme care when handling or setting down the
cylinder rod. Do not damage the chrome surface.
Reference Only
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