Operation and maintenance manual

SM 1393 Rev 1 2-00
2
Steering System - Steering Cylinder
Section 220-0120
1. Position the vehicle in a level work area, apply the
parking brake and switch off the engine. Turn steering
wheel in both directions several times to relieve any
pressure in the steering circuit.
2. Block all road wheels and place battery master
switch in the 'Off' position.
3. Support steering cylinder with blocks or suitable
lifting device.
4. Position a suitable oil container at line ends of one
cylinder. Ensure all hydraulic lines connected to the
steering cylinder assembly are identified for ease of
installation and disconnect hydraulic lines. Fit blanking
caps to all open lines and fittings to prevent ingress of
dirt.
5. Remove locknut (24), washer (25), hardened
washer (23) and bolt (22) securing pin (18) at piston
rod (2) end of cylinder assembly. Remove pin (18),
spacers (19) and seals (20 & 21, if fitted) from piston
rod (2) end of cylinder assembly.
6. Remove locknut (24), washer (25), hardened
washer (23) and bolt (22) securing pin (17) at base
end of cylinder assembly. Remove pin (17), spacers
(19) and seals (20 & 21, if fitted) from base end of
cylinder assembly.
7. Remove cylinder assembly to a clean area for
disassembly. Drain oil from cylinder assembly into a
suitable container.
8. Repeat steps 2 through 6 for opposite cylinder.
DISASSEMBLY
Numbers in parentheses refer to Fig. 1.
WARNING
To prevent personal injury and property
damage, be sure lifting equipment is properly
secured and of adequate capacity to do the job
safely.
1. Ensure clean working conditions, remove any port
plugs thus allowing easy entry of air into the cylinder,
preventing a vacuum when parts are withdrawn from
cylinder body (1).
2. Remove circlips (6) from base end of cylinder body
(1) and piston rod (2) end. Press out spherical
bearings (5).
3. Using special tool which can be fabricated as
shown in Fig. 2, unscrew end cap (4) until thread is
disengaged from cylinder body (1).
4. Support piston rod (2) at the rod eye and withdraw
from cylinder body (1). Ensure centre lines of piston
rod (2) and cylinder body (1) remain on the same axis
during removal of piston rod (2).
5. Place piston rod (2) on supports which will not
damage the piston rod diameter.
6. Remove and discard piston seal (12) and bearing
rings (10) from piston (3).
7. Remove grub screw (11) from bearing ring (10)
groove in piston (3).
8. Provide an anti-torsion device through piston rod (2)
eye to allow unscrewing of piston (3). Using special
tool which can be fabricated as shown in
Fig. 3, unscrew piston (3) from piston rod (2).
9. Remove and discard 'O' ring (13) and backup ring
(14) from piston (3).
10. Remove cushion sleeve (15) from piston rod (2).
11. Remove end cap (4) assembly from piston rod (2).
Remove and discard rod seal (8), wiper (9) and 'O'
ring (7) from end cap (4).
INSPECTION
Numbers in parentheses refer to Fig. 1
1. Clean all parts of the cylinder with a suitable solvent
and dry with clean, lint-free cloths. Clean all grooves
carefully to remove any foreign material.
2. Check cylinder body (1) and outer diameter of
piston (3) for scratches, cracks or other signs of
damage. Remove ridges, nicks and scratches with a
fine stone and re-clean. Replace any components
which cannot be repaired.
3. Inspect piston rod (2) for distortion, cracks or other
defects. Replace piston rod (2) if defective area is
irreparable.
4. Check spherical bearings (5) and cushion sleeve (15)
for wear and replace if necessary.
5. Replace all seals, 'O' rings and wipers.