SECTION 4 - HYDRAULICS
4-6 – JLG Lift – 3121642
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 gland groove.
WHEN INSTALLING ‘POLY-PAK’ PISTON SEALS, ENSURE SEALS ARE INSTALLED
PROPERLY. REFER TO WIPER SEAL INSTALLATION FOR CORRECT SEAL ORIEN-
TATION. IMPROPER SEAL INSTALLATION COULD RESULT IN CYLINDER LEAK-
AGE AND IMPROPER CYLINDER OPERATION.
WHEN INSTALLING THE WIPER SEAL ON THE LOWER (TOWER) LIFT CYLINDER,
APPLY LOCTITE® #609 ON THE WIPER SEAL IN THREE EVENLY SPACED PLACES
TO AID IN RETENTION OF THE SEAL.
2. Use a soft mallet to tap a new wiper seal into the appli-
cable cylinder head gland groove. Install a new wear
ring into the applicable cylinder head glandgroove.
3. Place a new “o”ring and back-up seal in the applicable
outside diameter groove of the cylinder head.
4. Install washer ring onto rod. Carefully install the head
gland on the rod, ensuring that the wiper and rod seals
are not damaged or dislodged. Push the head along the
rod to the rod end, as applicable.
5. Carefully slide the piston spacer on the rod.
6. If applicable, correctly place new o-ring in the inner pis-
ton diameter groove. (The backup ring side facing the
O-ring is grooved.)
7. If applicable, correctly place new seals and guide lock
rings in the outer piston diameter groove. (A tube, with
I.D. slightly larger than the O.D. of the piston is recom-
mended to install the solid seal.)
NOTE: The backup rings for the solid seal have a radius on one
side. This side faces the solid seal. [See magnified insert in
(See Figure 4-11.)] The split of seals and backup rings must
be positioned so as not to be in alignment with each other.
Figure 4-7. Rod Seal Installation
Figure 4-8. Poly-Pak Piston Seal Installation
Figure 4-9. Wiper Seal Installation
Figure 4-10. Installation of Head Seal Kit
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