Rod Seal Installation - JLG 400S Service And Maintenance Manual

SECTION 5 - BASIC HYDRAULICS INFORMATION & SCHEMATICS
CLEANING AND INSPECTION
1. Clean all parts thoroughly in an approved cleaning
solvent.
2. Inspect the cylinder rod for scoring, tapering, ovality or
other damage. If necessary, dress rod with Scotch Brite
or equivalent. Replace rod if necessary.
3. Inspect inner surface of cylinder barrel tube for scoring
or other damage. Check inside diameter for tapering or
ovality. Replace if necessary.
4. Inspect threaded portion of barrel for damage. Dress
threads as necessary.
5. Inspect cylinder head inside diameter for scoring,
tapering, ovality or other damage. Replace if necessary.
6. Inspect threaded portion of head for damage. Dress
threads as necessary.
7. Inspect seal and o-ring grooves in head for burrs and
sharp edges. Dress applicable surfaces as necessary.
8. Inspect cylinder head outside diameter for scoring,
tapering or ovality other damage. Replace if necessary.
9. Inspect port block fittings and valves. Replace if neces-
sary.
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. See the respective JLG Parts Manual.
NOTE: Apply a light film of hydraulic oil to all components prior to
assembly.
1. A special tool is used to install a new rod seal into the
applicable cylinder head groove.
Figure 5-83. Rod Seal Installation
5-82
WHEN INSTALLING NEW SEALS, ENSURE SEALS ARE INSTALLED PROPERLY.
IMPROPER SEAL INSTALLATION COULD RESULT IN CYLINDER LEAKAGE AND
IMPROPER CYLINDER OPERATION.
2. Use a soft mallet to tap a new wiper seal into the appli-
cable cylinder head groove. Install a new bearing and
backup ring into the applicable inside diameter of the
cylinder head groove.
Figure 5-84. Wiper Seal Installation
3. Place new o-rings in the applicable outside diameter
groove of the cylinder heads.
4. Place new piston seal in the applicable groove of the
rod.
5. With barrel clamped secured and adequately support-
ing the rod, insert the rod into the barrel cylinder.
6. Carefully install the cylinder head on both the side of the
rod, ensuring that the wiper and rod seals are not dam-
aged or dislodged. Push the heads along the rod to the
barrel, as applicable.
7. Install new plugs into the cylinder port block.
3121671