JLG 2658E3 Service Manual - Manual (Page 26)

SECTION 2 - PROCEDURES
2-14 – JLG Lift – 3120878
9. Inspect cylinder guide outside diameter for scoring
or other damage and ovality and tapering. Replace
as necessary.
10. Inspect the oil ports for blockage or the presence of
dirt or other foreign material. Repair as necessary.
Assembly
NOTE: Prior to cylinder assembly, ensure that the proper
cylinder seal kit is used.
Apply a light film of hydraulic oil to all components
prior to assembly.
1. Using suitable protection, clamp the cylinder rod in
a vise or similar holding fixture.
2. Place a new wiper ring , rod seal , o-ring , and back-
up ring into the applicable cylinder guide grooves.
3. Carefully install the guide on the rod, ensuring that
the wiper ring and rod seal are not damaged or dis-
lodged. Push the guide onto the rod.
4. Place a new piston ring and o-rings on the piston.
5. Carefully place the piston on the threaded end of the
cylinder rod, ensuring that the o-ring is not damaged
or dislodged. Push the piston onto the rod as far as
it will go.
6. Install the piston locknut on the threaded end of the
cylinder rod and torque to 136-163 Nm (100-120 ft.
lb.).
7. Remove the cylinder rod from the holding fixture.
8. Position the cylinder barrel in a suitable holding fix-
ture.
EXTREME CARE SHOULD BE TAKEN WHEN INSTALLING THE
CYLINDER ROD, GUIDE, AND PISTON. AVOID PULLING THE ROD
OFF-CENTER, WHICH COULD CAUSE DAMAGE TO THE PISTON
AND CYLINDER BARREL SURFACES.
9. With the barrel clamped securely, and while ade-
quately supporting the cylinder rod, insert the piston
end of the rod into the cylinder barrel. Ensure that
the piston ring and o-ring are not damaged or dis-
lodged.
Figure 2-15. Brake Cylinder Assembly