Upright AB38, Service & Parts Manual

Page: 49 / 133

Maintenance Section
4-19 AB38 Work Platform
Figure 4-15: Lower Lift Cylinder
1. Rod End Pivot Pin
2. Bushings
3. Pin Lock Plate
4. Lower Boom
5. First Post
6. Lower Lift Cylinder
7. Trunnion
8. Trunnion Screw
4.14
1
2
3
4
5
7
6
8
4.14 Lower Lift Cylinder
(Figure 4-15)
REMOVAL
The Lower Lift Cylinder is heavy, so utilise
appropriate lifting equipment to support the
unit before removing pins.
1. Ensure that the AB38 is on firm level ground,
the Elevating Assembly is completely stowed,
the Keyswitch is to the ‘OFF’ position and the
Emergency Stop Button is pressed.
2. Provide a suitable container to collect the
hydraulic fluid, then disconnect the hydraulic
hoses. Immediately plug hoses to prevent
foreign material from entering.
3. Remove securing bolts and pin lock plates from
the cylinder pins.
4. Support rod end of cylinder and remove rod end
pivot pin. Move cylinder backwards to rest
against the first post.
5. Support the cylinder so that the Trunnion Pivot
bushings can be removed. This is done by
releasing the eight 8 mm Allen head bolts.
Remove the cylinder from the machine.
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 sensitive to contamination.
DISASSEMBLY
1. Unscrew the headcap and withdraw the rod and
piston assembly from the barrel tube.
2. Unscrew the piston nut and remove piston and
headcap from the cylinder rod.
3. Remove the piston static O-ring from the
cylinder rod.
4. Remove the piston seal from the piston.
5. Remove the rod seal, rod wiper and static seal
from the headcap.
6. 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.
CLEANING AND INSPECTION
1. Clean all metal parts in solvent and blow dry
CAUTION