SkyTrak 8042 Service Manual - Manual (Page 526)

8.111 Model 8042, 10042, 10054 Legacy Rev. 10/03
Hydraulic System
4. ALWAYS use new oiled o-rings, seals, gaskets, etc.
DO NOT overstretch seals, wipers and o-rings. After
installing such parts, verify that they are not twisted
in their grooves.
5. To aid in installation, lubricate piston seals and the
seal installation path with clean, filtered hydraulic oil.
6. Lubricate the outer surfaces of the seals and o-rings
and the inside of the tube, piston and head gland
with clean, filtered hydraulic oil. Use a suitable
installation or compression tool when installing the
piston and head gland into the cylinder to help
prevent twisting or damaging the seals and o-rings.
When sliding the rod and piston assembly in the
tube, DO NOT damage the piston by scraping it
against the threads in the tube. Keep the rod in line
with the tube to prevent binding.
7. Follow the manufacturer’s instructions when
applying primer, locking or retaining compounds that
are specified in the cylinder assembly procedures.
The use of primer is recommended in some cases to
decrease cure time. Allow sealant to cure fully before
proceeding with the assembly procedure. The curing
process may be hastened by the use of a heat gun
to blow warm, dry air on the parts.
8. After assembling a cylinder, test the cylinder at low
operating pressures. Verify that the piston and rod
move freely in both directions.
9. Increase the operating pressure to the maximum
pressure recommended for the cylinder. Check for
external leakage and for free movement in both
directions.
10. Retract the piston fully. Cap the hydraulic fittings.
8.13.4 Attachment Tilt Cylinder
The attachment tilt cylinder (9) is attached at the front of
the inner boom inside the gooseneck (10).
a. Attachment Tilt Cylinder Removal
1. Remove any attachment from the vehicle. Park the
vehicle on a firm, level surface, fully retract the boom.
Allow sufficient work space at the front of the boom.
Raise the boom enough to allow the quick attach or the
bottom of the gooseneck to clear the ground. Place the
travel select lever in (N) NEUTRAL, place the neutral
lock lever in the (N) NEUTRAL LOCK position, engage
the park brake switch and shut the engine OFF.
2. Place an Accident Prevention Tag on both the
ignition key switch and the steering wheel, stating
that the vehicle should not be operated. (Refer to
Section 1.5, “Accident Prevention Tags.”)
3. Unlock and open the rear door. Allow the hydraulic
fluid to cool.
4. Label or otherwise mark the hydraulic hoses in
relation to the attachment tilt cylinder. Disconnect
and cap both hoses and attachment tilt cylinder
fittings. Refer to Section 3, “Boom.”
5. Remove the retaining bolt at the rod end of the
attachment tilt cylinder. Remove the lower pivot pin.
6. Attach a suitable sling to an appropriate lifting device
and to the attachment tilt cylinder. Make sure the
device used can actually support the cylinder.
7. Remove the two 2" external retaining rings securing
the attachment tilt cylinder base pin to the boom.
8. Remove the lower attachment tilt cylinder pin by
tapping it out through the bottom of the quick attach
(if installed).
9. Remove the attachment tilt cylinder base pin by
tapping it out through the top of the gooseneck.
10. Remove the attachment tilt cylinder from the vehicle.
Wipe up any hydraulic fluid spillage in, on, near or
around the vehicle.
MH3670
9
10
WARNING:
Hot hydraulic fluid can
cause severe burns. Wait for hydraulic fluid to
cool before servicing any hydraulic component.
WARNING:
Escaping hydraulic fluid
under pressure can penetrate the skin, causing
death or serious injury. Relieve hydraulic
pressure before servicing any hydraulic
component.