SkyTrak 8042 Service Manual - Manual (Page 533)

Hydraulic System
8.118 Model 8042, 10042, 10054 Legacy Rev. 10/03
f. Attachment Tilt Cylinder Installation
1. Attach a suitable sling to an overhead crane or other
suitable device and to the attachment tilt cylinder.
Make sure the device used can actually support the
cylinder. Place the attachment tilt cylinder in position
within the gooseneck. Refer to Section 3, “Boom.”
2. Install the lower attachment tilt cylinder pin by
tapping it through the bottom of the quick attach (if
installed). Install the retaining bolt.
3. Coat the attachment tilt cylinder base pin with anti-
seize compound, and install the pin by tapping it in
through the top of the gooseneck.
4. Secure the attachment tilt cylinder base pin to the
boom with two 2" external retaining rings.
5. Install the lower pivot pin and quick attach as required.
6. Connect the attachment tilt cylinder hydraulic hoses
in relation to the labels or markings made during
removal.
7. Start the engine and run at approximately one-third to
one-half throttle for about one minute without moving the
vehicle or operating any hydraulic functions.
8. Inspect for leaks and check the level of the hydraulic
fluid in the reservoir. Add hydraulic fluid to the
reservoir as needed. Shut the engine OFF.
9. Wipe up any hydraulic fluid spillage in, on, near and
around the vehicle, work area and tools.
10. Conduct a pressure check of the attachment tilt
cylinder hydraulic circuit and bleed the circuit as
outlined in the procedure that follows.
g. Attachment Tilt Cylinder Pressure Checking and
Circuit Bleeding
1. Attach a 4000 psi (276 bar) gauge to the test fitting
on the main control valve to test the system
pressure. Pressure readings should be
3000 ±100
psi (207 ±7 bar). Refer to Section 8.7, “Hydraulic
System Testing.” To check the cylinder pressure,
consult the factory.
2. With no accessory installed on the quick attach, start
with the lift/lower and attachment tilt cylinders fully
retracted.
3. Fully extend the attachment tilt cylinder. Hold the
attachment tilt joystick at full extend while fully
raising the lift/lower cylinder.
4. Fully retract the attachment tilt cylinder. Hold the
attachment tilt joystick at full retract while fully
retracting the lift/lower cylinder.
5. Repeat Steps 3 and 4 five times.
WARNING:
Avoid prolonged engine
operation in closed areas with inadequate
ventilation. Failure to properly ventilate exhaust
fumes can result in death or serious injury.
WARNING:
Escaping hydraulic fluid
under pressure can penetrate the skin, causing
death or serious injury.