Assembly - JLG TOUCAN 8E Service And Maintenance Manual

6. If applicable, inspect piston surface for damage and
scoring and for distortion. Dress piston surface as
necessary.
7. If applicable, inspect piston grooves for burrs and
sharp edges. Dress applicable surface as neces-
sary.
8. Inspect cylinder head gland inside diameter for scor-
ing or other damage and for ovality and tapering.
Replace cylinder if necessary.
9. Inspect threaded portion of cylinder head gland for
damage. Dress threads as necessary.
10. Inspect seals grooves in head gland for burrs and
sharp edges. Dress applicable surfaces as neces-
sary.
11. Inspect cylinder head gland outside diameter for
scoring or other damage and ovality and tapering.
Replace cylinder if necessary.
12. If applicable, inspect rod and barrel bushings for
excessive wear or damage. Replace as necessary.
13. 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 your JLG Parts manual.
Apply a light film of hydraulic oil to all components
prior to assembly.
1. Install new seal(s), backup ring(s) and guide bands
into the applicable cylinder head gland groove(s).
Mast and Jib cylinder only: install guide bands so
that the splits are not in alignment with each other.
2. Use a soft mallet to tap a new wiper seal into the
applicable cylinder head gland groove (the flat part
of seal must be facing into head).
3. Jib and steer cylinders only: place new O-rings and
backup rings in the applicable outside diameter
grooves of the cylinder head.
4. Carefully install the head gland on the rod, ensuring
that the wiper and rod seals are not damaged or dis-
lodged.
5. Steer cylinder only: install O-ring, piston seal,
angled guides and split backup rings on piston parts
and slide the piston assembly on the rod. Secure the
piston assembly with the locknut.
Mast cylinder only: install a new rod guide.
6. Position the barrel in a suitable holding fixture.
NOTICE
EXTREME CARE SHOULD BE TAKEN WHEN INSTALLING THE
CYLINDER ROD, HEAD AND PISTON. AVOID PULLING THE ROD
OFF CENTER, WHICH COULD CAUSE DAMAGE TO THE PISTON
AND CYLINDER BARREL SURFACES.
7. With the barrel clamped securely, and while ade-
quately supporting the rod, insert the piston end into
31210090
the cylinder barrel. Ensure that piston seals are not
damaged or dislodged when entering the threaded
area of the barrel (Steer cylinder).
8. Continue pushing the rod into the barrel until the cyl-
inder head gland can be inserted into/onto the bar-
rel cylinder.
9. Secure the cylinder head gland.
10. After the cylinder has been reassembled, the rod
should be pushed all the way (fully retracted).
– JLG Lift –
SECTION 7 - HYDRAULICS
7-11