HYDRAULIC SYSTEM RT540E SERVICE MANUAL
2-60 Published 4-20-2015, Control # 502-01
DUAL ROD TELESCOPE CYLINDER
Description
The boom dual rod telescope cylinder (upper telescope
cylinder) has a 17.7 cm (7.0 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 seal in the head. O-ring seals prevent
internal and external leakage (Figure 2-33).
The cylinder incorporates two cylinder rods with separate
strokes. One rod has a stroke of 736.0 cm (289.8 inches),
and one rod has a stroke of 743.7 cm (292.8 inches), which
provides a combined overall stroke of 1479.7 cm (582.6
inches).
The cylinder weighs approximately 1249 kg (2753.5 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 rings
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 cylinder head from the outer rod.
8. Remove the O-ring and backup ring from the outside of
the head and the wear rings, buffer seal, rod seal,
backup ring and the wiper ring from the inside of the
head.
9. Using a spanner wrench, unscrew the inner cylinder
head from the outer cylinder rod.
10. Remove the inner cylinder rod assembly from the outer
cylinder rod and cover the opening to avoid
contamination.
11. Remove the hydrolock piston seal to gain access to the
setscrew securing the piston to the inner cylinder rod.
12. Remove the setscrew and unscrew the piston from the
cylinder rod.
13. Remove the remaining hydrolock seal and wear ring
from the outside of the piston and the O-ring and two
backup rings from the cylinder rod
14. Remove the spacer from the rod and remove the wear
ring from the spacer.
15. Remove the cylinder head from the inner rod.
16. Remove the O-ring and backup ring from the outside of
the head and the wear rings, buffer seal, deep Z rod
seal, backup ring and the wiper ring from the inside of
the head.
17. If necessary, remove the holding valve from the inner
cylinder rod and from the cylinder barrel.
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
To Next Page
Loading...
Need help?
General
