Upright X Series, Service & Parts Manual

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Page 3-20
Maintenance
3.17 - Lift Cylinder
X Series Work Platform
3.17 L
IFT
C
YLINDER
The X20N, X20W and X26N are all equipped with one Lift Cylinder. The X31N has two Lift Cyl-
inders. The procedure for removing the lift cylinder(s) is the same for all models.
R
EMOVAL
Figure 3-24: Five Section Scissor Assembly
1. Elevate platform and install brace. (See
“Supporting Elevating Assembly” on Page
3-4.)
2. Provide a suitable container to catch the
hydraulic fluid, then disconnect the hydrau-
lic hoses from the cylinder. Immediately
plug hoses and fittings to prevent foreign
material from entering.
3. Remove Emergency Lowering Valve Cable
and Down Valve wires from the Emergency
Lowering/Down Valve.
4. Remove retaining rings securing Lift Cylin-
der Pivot Pins. On X26N machines, remove
the left roll pin in the Upper Pivot Pin.
5. Remove lower Pivot Pin by driving pin
towards locking pin side. Lower cylinder to
rest on chassis.
6. Attach a suitable hoisting device and sling
to the cylinder, and remove upper Pivot Pin.
7. Carefully remove the cylinder.
D
ISASSEMBLY
1. Remove the fittings and Down Valve from
the cylinder assembly.
2. Unscrew the headcap, and remove the rod
and piston assembly from the barrel tube.
3. Unscrew the piston from the rod, then
remove the head cap from the cylinder rod.
4. Remove all O-rings, seals, and wipers from
the head cap, piston and rod.
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
head cap, inside of the cylinder barrel and the rod for signs of scoring or excessive wear.
4. Replace all seals and O-rings.
W A R N I N G
! !
Use a suitable maintenance stand to access the upper lift cylinder on the
X31N. DO NOT stand on the elevating assembly.
11
9
10
1B
6
5
4
3
2
9
8
7
2
1A
6
5
4
3
1A. Lower Lift Cylinder
1B. Upper Lift Cylinder
2. Valve Solenoid
3. Velocity Fuse
4. Roll Pin
5. Retaining Ring
6. Lift Cylinder Pin
7. Shaft Locking Pin
8. Bottom Inner Weldment
9. Cable Channel
10. Mid Inner Arm Weldment
11. Top Inner Arm Weldment
060571-005