TL33 Work Platform 4-16
4.12 Lower Lift Cylinder (Figure 4-14)
REMOVAL
1. Ensure Elevating Assembly is completely lowered and
that the booms are in their rest position.
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 circlips and securing bolts from cylinder pins.
4. Support rod end of cylinder and remove rod end pivot
pin. Move cylinder backwards to rest against the first
post.Note: The cylinder is heavy, so utilise appropriate
lifting tackle to support the unit before removing pins.
5. Support the cylinder so that the barrel end cylinder pin
can be removed, then remove the cylinder from the
machine.
6. Move the cylinder to a prepared work area.
DISASSEMBLY (Refer to Figure 4-15)
1. Unscrew the headcap and withdraw the rod and piston
asssembly 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. Remove the valve block from the cylinder barrel.
7. Care should be taken to save the O-ring for later use.
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 or excessive
wear.
4. Replace any parts found to be unserviceable.
REASSEMBLY
1. Lubricate and install new rod seal, rod wiper and static
seal on the headcap.
NOTE: Muli-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.
NOTE: Installing the headcap over the pivot hole in
the
shaft could damage the seals.
4. Install a new piston static O-ring, the piston and piston
nut on the cylinder rod. Screw nut to end of thread and
secure with set screw.
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 upper cylinder valve block. Check O-rings.
INSTALLATION
NOTE: Before installing Lift Cylinder check cylinder
pins and bearings for wear and replace if
necessary.
1. Install barrel end bearing (if removed)
2. Rest the lift cylinder against the first post.
3. Lift the barrel end of the cylinder into place and push
the cylinder pin in until approx. 38mm (11/2 in.) is still
exposed.
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.
4. Install anti-rotation pin into cylinder pin aligning with
hole in the mast and push the cylinder pin completely
in and secure the circlip.
5. Install rod end bearings (if removed).
6. Lift rod end of cylinder into place and insert pin until
approx. 38mm (11/2 in.) is still exposed. Install anti
-rotation pin.
7. Install circlips and securing bolts.
8. Test with weight at rated platform load to check system
operation.
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