Snorkel A38E-sn004500+ - Manual (Page 57)

Maintenance Section
4-27 A38E Work Platform
INSTALLATION
NOTE: Before installing the Slave Cylinder check
cylinder pins and bearings for wear and replace if
necessary.
1.
Install barrel end bearing (if removed)
2. Lift the barrel end of the cylinder into place.
NOTE: Take care in aligning the holes so that
the barrel end pivot 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
the bracket, push the cylinder pin completely in
and fix pin lock plate with bolt. Attach the circlip
inside the Telescopic Boom.
4. Install rod end bearings (if removed).
5. Lift rod end of cylinder into place and insert rod
end pivot pin. Install pin lock plate.
6. Fix pin lock plate with bolt.
7. Test with weight at rated platform load to check
system operation.
BLEEDING THE MASTER/SLAVE
LEVELLING CIRCUIT
When air enters the Master/Slave Levelling circuit the
Slave Levelling Cylinder is prevented from following
the master cylinder precisely. If it seems there may
be air in the system the following procedures should
be followed.
1. While outside the Platform activate the Levelling
Switch function and level the cage in the for-
ward direction. Continue this until, and for 30
seconds after, the Platform comes to a stop.
2. Activate the Levelling function in the backward
direction. Continue this until, and for 30
seconds after, the Platform comes to a stop.
Care must be taken that the Platform Cage
does not impact on the ground. Repeat this
procedure until the cage becomes level when
elevated.
The above two procedures have the effect of
‘Priming’ the Levelling Circuit. Test to see if the Slave
Cylinder is operating correctly. If not follow the
procedures below.
3. Ensure the Elevating Assembly is fully stowed
and the booms are in their rest position.
4. Remove securing bolts and pin lock plates from
the rod end cylinder pin of the Master Cylinder.
5. Remove the rod end pivot pin. Move cylinder
backwards and allow to hang freely.
6. Loosen, but do not fully disconnect, the hose
fitting at ‘B’. Prepare to activate the Levelling
4.19
Switch while a colleague holds a cloth at the
fitting ‘B’. Air will be expelled through this fitting.
7. Activate the Switch slowly in both directions
until all air is expelled and hydraulic fluid begins
to appear.
8. Repeat the above procedure for fitting ‘A’. Lift
the rod end of the cylinder into place and insert
the pin until the circlip grooves are exposed,
then attach the circlip. Install the pin lock plate.
9. Fix the pin lock plate with the bolt.
10. Support the Platform before removing the
securing bolts and pin lock plates from the
Slave Cylinders rod end pivot pin.
11. Remove the rod end pivot pin. Move the cylinder
backwards allowing it to hang freely. Rotate the
cylinder backwards.
12. Repeat the procedures outlined in Items 6, 7 &
8 for the Slave Cylinder.
13. Lift rod end of cylinder into place and insert pin.
Install pin lock plate.
14. Fix pin lock plate with bolt.