JLG 260MRT - STEER CYLINDER REPAIR

SECTION 2 - PROCEDURES
2-14 3121801
2.11 STEER CYLINDER REPAIR
Removal
Before beginning this procedure, ensure that the parking
brake is engaged and the rear wheels are chocked.
1. Tag and disconnect the hydraulic lines to the steer cylin-
der, then cap the steer cylinder hydraulic lines and ports.
2. At each steer spindle, remove the bolt and lock nut
securing the steer cylinder to the spindle.
3. When the steer cylinder is disconnected from the steer
spindles, turn each wheel by hand to give clearance to
remove the steer cylinder from the front axle.
4. Carefully lift the steer cylinder until the cylinder mount-
ing block clears the mounting slot in the bottom of the
axle, then slowly remove the cylinder from the axle and
place it in a suitable work area.
Disassembly
DISASSEMBLY OF THE CYLINDER SHOULD BE PERFORMED ON A CLEAN WORK
SURFACE IN A DIRT FREE WORK AREA.
1. Place the cylinder barrel into a suitable holding fixture.
2. Using a suitable chain wrench, carefully remove the cyl-
inder head retainer from one end of the cylinder barrel.
3. Attach a suitable pulling device to one end of the cylin-
der rod.
EXTREME CARE SHOULD BE TAKEN WHEN REMOVING THE CYLINDER ROD,
SPACER, AND PISTON. AVOID PULLING THE ROD OFF-CENTER, WHICH COULD
CAUSE DAMAGE TO THE PISTON AND CYLINDER BARREL SURFACES.
4. With the barrel clamped securely, apply pressure to the
rod pulling device and carefully withdraw the complete
rod assembly from the cylinder barrel.
5. Using a suitable chain wrench, carefully remove the
remaining cylinder head retainer from the opposite end
of the cylinder barrel. Remove the head and remove and
discard the wiper, rod seal, 0-ring and wear ring.
6. Using suitable protection, clamp the cylinder rod in a
vise or similar holding fixture.
7. Carefully remove the head from the cylinder rod and
remove and discard the wiper, rod seal, o-ring and wear
ring.
8. Carefully remove the spacers from the cylinder rod, then
remove the retaining rings securing the piston in place
on the cylinder rod. Discard the retaining rings.
9. Carefully remove the piston from the cylinder rod.
Remove and discard the T-seal and o-ring.
10. Remove the cylinder rod from the holding fixture.
Cleaning and Inspection
1. Clean all parts thoroughly in an approved cleaning sol-
vent.
2. Inspect the cylinder rod for scoring, tapering, ovality, or
other damage. If necessary, dress the rod with Scotch
Brite or equivalent. Replace the rod if necessary.
3. Inspect the threaded portion of the rod for excessive
damage. Dress the threads as necessary.
4. Inspect the inner surface of the cylinder barrel tube for
scoring or other damage. Check the inside diameter for
tapering or ovality. Replace the barrel if necessary.
5. Inspect the piston surface for damage, scoring and dis-
tortion. Dress the piston surface or replace the piston as
necessary.
6. Inspect the seal and o-ring grooves in the piston for
burrs and sharp edges. Dress applicable surfaces as nec-
essary.
7. Inspect the inside diameter of the spacers and heads for
scoring or other damage and for ovality and tapering.
Replace as necessary.
8. Inspect the seal and o-ring grooves in the heads for
burrs and sharp edges. Dress applicable surfaces as nec-
essary.
9. Inspect the outside diameter of the spacers and heads
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.
11. Inspect the cam follower for wear or damage. Replace as
necessary.