Hydraulic Cylinders; Axle Lockout Cylinder - JLG 400S Service And Maintenance Manual

5.3 HYDRAULIC CYLINDERS

Axle Lockout Cylinder

DISASSEMBLY
DISASSEMBLY OF THE CYLINDER SHOULD BE PERFORMED ON A CLEAN WORK
SURFACE IN A DIRT FREE WORK AREA.
ROD CAN FALL OUT OF BARREL AND CAUSE INJURY OR DAMAGE TO THE
EQUIPMENT. BE CAREFUL WHEN REMOVING AXLE CYLINDER. OPENING BLEED
VALVE CAN CAUSE ROD TO FALL OUT OF BARREL.
1. Open bleeder valve. Rotate rod and remove from barrel.
2. Remove two wear rings, wiper seal and rod seal from
grooves of barrel bore. Do not scratch barrel bore.
3. Remove counterbalance valve and plugs.
CLEANING AND INSPECTION
1. Inspect bore and rod for scoring, pitting, or excessive
wear.
2. Remove minor surface blemishes with wet sandpaper.
3. Pitting requires replacement of barrel and rod.
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SECTION 5 - BASIC HYDRAULICS INFORMATION & SCHEMATICS
ASSEMBLY
NOTE: Prior to cylinder assembly, ensure that the proper cylinder
seal kit is used. See your JLG Parts Manual.
NOTE: Apply a light film of hydraulic oil to all components prior to
assembly.
WHEN INSTALLING NEW SEALS, ENSURE SEALS ARE INSTALLED PROPERLY.
IMPROPER SEAL INSTALLATION COULD RESULT IN CYLINDER LEAKAGE AND
IMPROPER CYLINDER OPERATION.
1. Install two new wear rings, wiper seal and rod seal in
barrel bore grooves. Make sure they are not twisted.
2. Lubricate rod bore with clean hydraulic fluid.
EXTREME CARE SHOULD BE TAKEN WHEN INSTALLING THE ROD. AVOID PULL
ING THE ROD OFF-CENTER, WHICH COULD CAUSE DAMAGE TO THE ROD AND
CYLINDER BARREL SURFACES.
3. Insert and push the rod into top of barrel bore, rotate to
install the rod into barrel bore.
4. Install plugs and counterbalance valve. Torque the plugs
to 22-24 ft. lbs. (30-33 Nm) and counterbalance valve to
22 ft. lbs. (30 Nm).
5. Bleed system.
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