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Maintenance 3.17 - Lift Cylinder
MX15/19
3.17 L
IFT
C
YLINDER
R
EMOVAL
1. Elevate the platform and install the scissor brace (see “Supporting the Elevating Assembly”
on Page 3-4).
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 emergency lowering valve cable and down valve wires from the emergency lower-
ing/down valve.
4. Remove the cable bracket from the lift cylinder.
5. Remove capscrews and locknuts securing lift cylinder pivot pins.
6. Remove lower pivot pin and lower cylinder to rest on chassis.
7. Attach a suitable hoisting device and sling to the cylinder, and remove upper pivot pin.
8. Carefully remove cylinder.
D
ISASSEMBLY
1. Remove the fittings, orifice, spring, and down valve from the cylinder assembly.
2. Loosen the set screw and unscrew the thread cap. Unscrew the internal head cap and with-
draw the rod and piston assembly from the barrel tube.
3. Remove the piston from the rod, and then remove the head cap from the cylinder rod.
4. Remove all O-rings, seals, and wipers from the head cap and cylinder barrel.
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.
R
EASSEMBLY
1. Lubricate and install new O-rings, seals, and wipers in the cylinder barrel and on the head
cap.
NOTE: Multipurpose lubricant should be used.
2. Install the thread cap, head cap, and piston on the cylinder rod.
3. Lubricate the piston and install the piston/rod assembly in the barrel tube.
4. Install the head cap into the barrel tube.
5. Thread the thread cap onto the barrel tube and tighten. Secure with the set screw.
6. Install the down valve, orifice, spring, and fittings.
I
NSTALLATION
1. Coat both pivot pins with anti-seize compound.
2. Attach a suitable hoisting device and sling to the cylinder. Carefully position cylinder in the
elevating assembly, and install the upper pivot pin.
3. Install the capscrew and locknut.
4. Carefully lift the cylinder and align the lower mount, and install the pivot pin. Install the cap-
screw and locknut securing the pivot pin.
5. Install the cable bracket. Connect the emergency lowering valve cable and down valve wires.
6. Unplug hydraulic hoses and attach to the cylinder.
7. Replace hydraulic fluid removed from lift cylinder.
8. Test with weight at rated platform load to check system operation. Check for leaks and level
of fluid.
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