Snorkel A38E-sn004500+ - Manual (Page 53)

Maintenance Section
4-23 A38E Work Platform
CLEANING AND INSPECTION
1. Clean all metal parts in solvent and blow dry
with filtered compressed air.
2. Check all threaded parts for stripped or
damaged threads.
3. Check the bearing surfaces inside of the
headcap, outer edge surface of the piston,
inside of the cylinder barrel and the shaft for
signs of scoring, pits, excessive wear or
polishing. Scratches or pits deep enough to
catch a fingernail are unacceptable. Polishing is
a sign of uneven loading and if sufficiently
polished the affected parts should be replaced.
4. Replace any parts or seals found to be
unserviceable.
REASSEMBLY/SEAL REPLACEMENT
1. Lubricate and install new rod seal, rod wiper
and static seal on the headcap.
NOTE: Multi-purpose lubricant should be used.
2. Install a new piston seal on the piston.
3. Install the headcap on the cylinder from the
piston end.
4. Install the piston, piston nut and a new piston
static O-ring on the cylinder rod. Screw nut to
end of thread and secure with circlip.
5. Lubricate the piston seal and install the piston
and rod assembly in the barrel tube.
6. Thread headcap onto barrel tube and hand
tighten, then turn 1/4 turn further.
7. Install the telescopic cylinder’s Overcentre and
Check Valves.
INSTALLATION
NOTE: Before installing Telescopic Cylinder check
cylinder pins and bearings for wear and replace if
necessary.
1.
Lift the Telescopic Cylinder so that it will be able
to slide down Boom 2.
2. While maintaining a positive hold on the cylinder
position the barrel end of the cylinder into place.
Push the cylinder pin in.
NOTE: Take care in aligning the holes so that
the pin can be pushed in by hand. If holes are
not properly aligned and the pin is forced in, the
bearings will be damaged.
3. Align pin lock plate on cylinder pin with hole in
Boom 2 and push the cylinder pin completely in
and fix pin lock plate with bolt.
4. Position the rod end of cylinder into place and
insert the pin until the circlip groove is exposed.
Replace the circlip.
5. From the Chassis Controls retract the
Telescopic Cylinder fully.
7. Test with weight at rated platform load to check
system operation.
4.17 Steering Cylinder
(Figure 4-19)
REMOVAL
1. Ensure that the A38E is on firm level ground,
the Elevating Assembly is completely stowed
but slewed away from centre, the Keyswitch is
to the ‘OFF’ position and the Emergency Stop
Button is pressed.
2. Straighten the drive wheels.
3. Provide a suitable container to collect the
hydraulic fluid, then disconnect the hydraulic
hoses. Immediately plug hoses to prevent
foreign material from entering.
4. Remove the circlips from each steering pivot
pin. Push the steering pivot pins out and rotate
the steering link arm away from the rod.
5. While supporting the cylinder remove the four
bolts from the front panel of the A38E’s
chassis.
6. Move the cylinder to a prepared work area. It is
important that clean assembly practices are
observed as seals and other hydraulic cylinder
components are highly sensitive to
contamination.
DISASSEMBLY (Refer to Figure 4-16)
1. Unscrew both of the headcaps and withdraw
the rod piston assembly (this is one unit) from
the barrel tube.
2. Remove the piston static O-ring from the
cylinder rod.
3. Remove the piston seal from the piston.
4. Remove the rod seal, rod wiper and static seal
from the headcap.
5. Care should be taken to save the O-ring and all
other seals for reassembly, if they have been
deemed serviceable following the cleaning and
inspection phase of maintenance.
4.17
Note: During seal replacement do not use sharp
edged tools to avoid cutting the seals, and allow
at least one hour for the seals to elastically
restore to their original shape before assembly.