Lull 944E-42 Service Manual - Manual (Page 156)

Hydraulic System
8-40 944E-42
e. Cylinder Installation
1. Grease the bushings at the ends of the hydraulic
cylinder. Using an appropriate sling, lift the cylinder
into it’s mounting position.
2. Align cylinder bushing and install pin, lock bolt or
retaining clip.
3. Connect the hydraulic hoses in relation to the labels
or markings made during removal.
4. Before starting the machine, check fluid level of the
hydraulic fluid reservoir and if necessary fill to full
mark with Mobilfluid 424
® (ISO 46).
5. Start the machine and run at low idle for about one
minute. Slowly activate hydraulic cylinder function in
both directions allowing cylinder to fill with hydraulic
oil.
6. Inspect for leaks and check level of hydraulic fluid in
reservoir. Add hydraulic fluid if needed. Shut the
engine OFF.
7. Wipe up any hydraulic fluid spillage in, on, near and
around the machine, work area and tools.
8. Close and secure the engine cover.
8.8.1 Cylinder Pressure Checking
Attach a 4000 psi (276 bar) gauge to the test port on the
hydraulic pump to check the system pressure. For more
information, refer to Section 8.3.1, “Pressure Checks and
Adjustments.”
Note: If a hydraulic cylinder pressure is greater than the
main control valve pressure, increase the main control
valve pressure by adjusting the main relief. Generally,
one half turn clockwise will be adequate to check an
individual circuit. Activate the circuit and if pressure is
obtained turn the main relief counter clockwise one half
turn. Re-check the main relief setting and adjust if
necessary.
8.8.2 Steering Cylinders
The steer cylinder is attached to each axle center
housing.The steer cylinder assembly can be found in
Section 5.3, “Axle Assemblies.” The steer cylinder is
covered in the appropriate manufacturer’s axle literature.
AXLE CENTER SECTION
STEERING CYLINDER