Oshkosh Corporation JLG 260MRT, Service Maintenance Manual

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SECTION 2 - PROCEDURES
2-14 – JLG Lift – 3121801
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 o-ring into the cylinder rod piston
groove.
3. Place a new T-seal on the piston, then carefully
install the piston the cylinder rod, ensuring that the
o-ring in the rod groove is not damaged or dis-
lodged. Secure the piston in place with two new
retaining rings.
4. Carefully slide the spacers onto the cylinder rod.
5. Place a new wiper, rod seal, o-ring and wear ring on
each of the two cylinder heads. Set the heads aside
for later installation on the cylinder rod.
6. Remove the cylinder rod assembly from the holding
fixture.
7. Position the cylinder barrel in a suitable holding fix-
ture.
EXTREME CARE SHOULD BE TAKEN WHEN INSTALLING THE
CYLINDER ROD, PISTON AND HEADS. AVOID PULLING THE ROD
OFF-CENTER, WHICH COULD CAUSE DAMAGE TO THE PISTON
AND CYLINDER BARREL SURFACES.
8. With the barrel clamped securely, and while ade-
quately supporting the cylinder rod assembly, insert
the cylinder rod assembly into the cylinder barrel.
Ensure that the piston T-seal and o-ring are not dam-
aged or dislodged.
9. Continue pushing the rod assembly into the cylinder
barrel until the cylinder rod is approximately cen-
tered in the barrel.
10. Carefully install one of the cylinder heads on one
end of the cylinder rod and push the head onto the
rod until it is snug against the end of the cylinder
barrel.
11. Install one of the cylinder head retainers on the end
of the cylinder barrel and tighten with a suitable
chain wrench.
12. Carefully install the remaining cylinder head on the
opposite end of the cylinder rod and push the head
onto the rod until it is snug against the end of the
cylinder barrel.
13. Install the remaining cylinder head retainer on the
end of the cylinder barrel and tighten with a suitable
chain wrench.
Installation
1. Carefully install the steer cylinder assembly into the
front axle. Align the cylinder mounting block on the
barrel with the mounting slot in the bottom of the
axle and lower the steer cylinder until the mounting
block rests in the slot.
2. Turn the steer wheels to line up the mounting holes
in the steer spindles and the steer cylinder ends.
Secure each end of the steer cylinder with a bolt and
lock nut.
3. Reconnect the hydraulic hoses to the applicable cyl-
inder ports.