SECTION 5 - MAST COMPONENTS
31215825
5-13
Cylinder Assembly
(See Figure 5-11.)
1.
Rinse the inside of the tube with hydraulic fluid and
allow to drain. A high-pressure rinse followed by a wipe
with a lint-free rag is preferable. Clean all internal com
-
ponents of any foreign material.
2.
Lubricate the head and all seals with hydraulic fluid prior
to installation. Install the seal, wiper, o-ring, back-up
ring, and retraining ring to the cylinder head.
3.
Lubricate the piston and all components with hydraulic
fluid. Install the seal and wear ring to the piston.
NOTE:
Re-check that seals are not twisted or pinched and are
properly seated.
4.
Place the rod on a clean table. Install the static piston o-
ring seal into the groove on the piston end of the rod.
5.
Install the head followed by the piston onto the rod not
-
ing the proper orientation of each component. Torque
the piston nut to 100-120 ft. lbs.
(136-163 Nm)
6.
When the rod assembly is ready to be installed into the
tube, liberally apply an anti-seize lubricant to the cylin
-
der head surface which slides into the cylinder tube.
7.
Next dip the entire rod assembly into hydraulic fluid and
stuff this assembly into the tube. Watch the seals as they
pass over the rod port
(if visible)
to be sure they are not
nicked or cut.
8.
Install the head until the retaining ring seats in it’s
groove.
Cylinder Installation
To install the lift cylinder reverse the Lift Cylinder Removal
instructions at the start of this section, however perform the
following additional steps during re-assembly.
1.
Apply Low Strength Threadlocking Compound (purple)
and torque to 85 ft. lbs.(115 Nm) the cylinder mount
shoulder screws securing the lift cylinder mount halves
together at the bottom of the mast.
2.
Check that the platform electrical control cables and the
sequence cables are seated in their sheave wheel
assemblies when extending mast sections for reassem
-
bly.
3.
After assembly, readjust the chain at the bottom of mast
section-3 and apply Medium Strength Threadlocking
Compound to the lock nuts before final tightening.
4.
Remove the plastic from under the hydraulic reservoir
tank cap.
Figure 5-11. Lift Cylinder Component Cross-Section
(MVL/MSP)
1.
Cylinder Rod
6.
Apply Anti-Seize
10.
Piston
2.
Cylinder Head
7.
Cylinder Tube
11.
Wear Ring
3.
Rod Wiper
8.
Spacer
12.
Piston O-Ring
4.
Rod Seal
9.
Piston Seal
13.
Piston Lock Nut (a)
5.
O-Ring
NOTE:
(a) Torque 100 - 120 ft. lbs.(136-163 Nm)
1
3
4
5
6
8
9
12
10
11
13
2
7
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