Upright SL20 Series, Service & Parts Manual

Page: 42 / 104

Page 3-20
Maintenance - 3.18 - Lift Cylinder
SL20
3.18 L
IFT
C
YLINDER
R
EMOVAL
1. Block Elevating Assembly (Figure 3-5).
2. Provide a suitable container to catch the hydraulic fluid, then disconnect the hydraulic
hoses. Immediately plug hoses to prevent foreign material from entering.
3. Remove the set screw from end of cylinder rod.
4. Place a 61 cm (2 ft.) long plank, at least 25 mm ((1 in.) thick, across the top of the modules.
5. Support rod end of cylinder and remove rod end cylinder pin and let cylinder down to rest on
the plank.
6. Support the lower tension links.
7. Attach a suitable hoisting device and sling to the cylinder.
8. Support the cylinder so the barrel end cylinder pin can be removed. Remove the pin, then
lift the cylinder from the machine with the hoisting device.
9. Move cylinder to a prepared work area.
D
ISASSEMBLY
1. Remove the set screw which secures the cylinder head.
2. Unscrew the head from the cylinder.
3. Pull the rod assembly out of the cylinder.
4. Remove the seal kit components from the head and piston.
5. Check the end bearing for wear. Remove and replace it if necessary.
C
LEANING AND
I
NSPECTION
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, the outer edge surface of the piston,
inside the cylinder barrel, and the shaft for signs of scoring or excessive wear.
4. Replace any parts found unserviceable.
R
EASSEMBLY
1. Lubricate and install the wear rings and seal on the piston.
2. Lubricate and install the static seal, rod seal and rod wiper on the head.
3. Carefully slide the rod assembly into the cylinder.
4. Screw the head into cylinder and secure it with the set screw.
I
NSTALLATION
NOTE:
Before installing the lift
cylinder check the cylinder pins
and bearings for wear and
replace if necessary.
1. Place two 61 cm (2 ft.) long planks, at least 25 mm (1 in.) thick, across the top of the mod-
ules.
2. Place the lift cylinder on the planks.
3. Lift the lower tension links into position.
4. Lift the barrel end of the cylinder into place and push the cylinder pin in until approximately
38 mm (1½ 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.
5. Install anti-rotation pin into cylinder pin aligning with the hole in the lower tension link and
push the cylinder pin completely in. Secure it with the set screw.
6. Lift the rod end of cylinder into place and insert pin. Install anti-rotation pin into rod-end pin
aligning it with the hole in the upper boom and push the cylinder pin in completely. Secure it
with the set screw.
7. Cycle lift cylinder several times to remove air from the system and to check for proper oper-
ation.
8. Test with weight at rated platform load to check system operation.