Depression Cylinder; Repair - Upright MX19 Service And Parts Manual

Section 3 - Service & Repair
3-8 C
YLINDERS
D
E P R E S S I O N
R
EMOVAL
1. Mark and disconnect the hose
assemblies from the cylinder fittings
and immediately cap the openings to
prevent foreign material from enter-
ing.
2. Place a support under the depres-
sion guard.
3. Remove the circlips from the pivot
pins.
4. Remove the pivot pins while support-
ing the cylinder.
5. Remove the cylinder.
R
EPAIR
Disassembly
1. Unscrew the head cap from the barrel, removing the head cap, piston, and shaft assembly from the
barrel tube.
2. Unscrew the piston.
3. Remove all rod wipers, U-cups, O-rings, and backup rings from the headcap, and discard.
4. Remove the piston ring and O-ring from the piston, and discard.
Cleaning and Inspection
1. Wash all the metal parts in cleaning solvent and blow dry with filtered compressed air.
2. Inspect all the threaded components for stripped or damaged threads.
3. Check the inside surface of the cylinder barrel for scoring or excessive wear.
4. Check the piston and headcaps for scoring or excessive wear.
5. Inspect the surface of the shaft for scoring or excessive wear.
Assembly
1. Lubricate and install new rod wiper, U-cup, O-ring, and backup ring on the headcaps.
2. Install the headcap onto the shaft.
3. Install the new piston rings and O-ring on the piston. Re-install the piston.
4. Lubricate the piston seal with clean hydraulic fluid and install the shaft assembly in the cylinder barrel.
5. Install the head cap into the cylinder barrel, and tighten the head caps.
I
NSTALLATION
Installation is reverse of removal.
503727-002
C
Y L I N D E R
Figure 3-10: Depression Cylinder Remove & Replace
Cylinders
Page 3-15