HYDRAULIC SYSTEM RT540E SERVICE MANUAL
2-68 Published 4-20-2015, Control # 502-01
STEER CYLINDER
Description
The steer cylinders (Figure 2-38) are mounted on the axles,
two cylinders on each axle. The front and rear steer cylinders
each have 6.3 cm (2.5 inch) diameter bores. The front and
rear steer cylinders each have a retracted length of 53.1cm
(20.94 inches) from bushing center to bushing center. The
front and rear steer cylinders each have an extended length
of 74.1cm (29.19 inches) from bushing center to bushing
center. Each cylinder has a stroke of 20.9 cm (8.25 inches).
A wiper ring prevents foreign material from entering each
cylinder. O-rings and other seals prevent internal and
external leakage.
The cylinder weighs approximately 9.07 kg (19.9 lb).
Maintenance
Disassembly
NOTE: Any maintenance requiring disassembly of the
cylinders should include replacement of all seals
and rings. A seal kit will supply the required items.
1. Secure the cylinder in a clean work area by use of
clamps or a chain vise to prevent rolling.
2. Retract the cylinder fully to avoid damaging the rod
during removal.
NOTE: Mark or note the piston and head relationship to the
rod and barrel.
3. Clean away all dirt from the head. Place protective
padding around the rod near the head to prevent
damaging the chrome during head removal.
4. Position the rod mount with the ports facing down.
5. Using a means of collecting the oil, remove the port
plugs and allow cylinder to drain.
6. Rapidly pull the rod against the head to free it. Remove
rod and attached parts from the barrel. Place the rod on
a surface that will not damage the chrome or allow the
rod assembly to drop.
NOTE: Cover the barrel opening to avoid contamination.
7. Remove the seal from the outside of the piston.
NOTE: Arranging discarded seals and rings in the order of
disassembly will aid in installation of new seals and
rings. Pay attention to how each seal and ring is
installed to avoid installing replacement seals and
rings improperly.
8. Loosen and remove the nut securing the piston.
Remove the piston from the rod.
9. Remove the O-ring from the inside of the piston.
10. Remove the head from the rod. Remove the O-ring and
backup ring from the outside of the head. Remove the
wiper ring and the rod seal from the inside of the head.
Inspection
1. Clean all parts with solvent and dry with compressed air.
Inspect for damaged or worn parts and replace as
required.
2. Stone out minor blemishes and polish with fine crocus
cloth.
3. Clean all with solvent and dry with compressed air any
parts that have been stoned and polished.
4. Inspect the barrel for scoring.
Assembly
NOTE: Lubricate new seals and rings with clean hydraulic
oil.
1. Install the replacement wiper ring into the head.
2. Install the rod seal in the inside of the head. Make sure
the lips of the seal face the piston.
DANGER
Do not use air pressure to remove the rod. Use only a
source of controlled hydraulic oil pressure if the rod is
hard to move.
CAUTION
Exercise extreme care when handling or setting down the
rod. Damage to the rod surface may cause unnecessary
maintenance and expense.
CAUTION
When removing seals and rings, avoid scratching the
grooved and gland surfaces.
CAUTION
Clean all surfaces and remove all burrs and nicks before
installing new seals and rings. Replace all damaged or
worn parts.
CAUTION
When installing new seals and rings, clean all surfaces
and carefully remove burrs and nicks. Parts displaying
excessive wear or damage should be replaced.
Reference Only
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