Base; System Relief Pressure Adjustment; Lift Pressure Adjustment - Skyjack SJ 3220 Service Manual

Service and Maintenance

Base

5.2-1

System Relief Pressure Adjustment

1. Locate the system pressure quick disconnect port
on the main manifold.
2. Install a calibrated 5000 psi gauge to the system
pressure quick disconnect port.
3. Remove the platform control console the guardrail
and disconnect from the main control cable.
4. Locate the main control cable plug at the rear of
the aerial platform.
5. Disconnect the main cable and connect the
platform control console into the plug.
6. At the main manifold, loosen the locknut on the
system relief valve R1.
7. Select drive with the lift/drive select switch on the
platform control console.
8. Engaged steer right and hold.
9. Observe reading on gauge. Adjust the R1 system
relief value listed on the serial number plate.
Turning the stem on the relief valve clockwise
will increases pressure. Turning the stem
counterclockwise will decreases pressure.
10. Release steer switch and tighten the locknut.
11. Remove the gauge from system pressure test
port.
SKYJACK, Page 6
5.2-2

Lift Pressure Adjustment

NOTE
Adequate area to raise the platform to full
height is required for the following steps.
1. Locate the lift pressure test port on the main
manifold.
2. Install a calibrated 3000 psi gauge to the lift
pressure quick disconnect port.
3. At the main manifold, loosen the locknut on the
lift relief valve R2.
4. Close the manual lowering valve. Use the lift
switch at the base control console to raise the
platform to full height and hold the lift up switch
on.
5. Observe the reading on the gauge. Adjust the
R2 relief valve to the value listed on the serial
number plate. Turning the stem of the relief valve
clockwise will increases pressure. Turning the
stem counterclockwise will decreases pressure.
6. Remove the gauge from lift pressure test port.
NOTE
Pressure setting may vary as aerial platform
components wear. The lift pressure should
be set for rated load only.
Section 5 - Procedures
SJIII Series