SWING SYSTEM RT880E SERVICE MANUAL
6-18 Published 11-10-2014, Control # 524-00
10. Activate all systems, cycle all functions, and observe for
proper operation. Adjust the slew potentiometer in
accordance with the procedures under Slew Potentiom-
eter Adjustment, page 6-18.
Preventive Maintenance
It is recommended that a normal inspection of the electrical
swivel collector ring and brush assembly be established. An
example of this could be at approximately 100 to 150 engine
operating hours. When this time limit is reached, perform the
following.
1. Check the collector ring and brush assembly for any cor-
rosion, pitting, arcing, and wear.
2. Check the collector ring setscrews and ensure they are
tight.
3. Check the brush and arm assembly springs. Ensure
they are holding the brushes firmly against the collector
rings.
Slew Potentiometer Adjustment
1. Rotate the superstructure over the front and engage the
house lock pin.
2. Set the RCL console to read slewing angle as follows:
NOTE: Refer to the PAT Rated Capacity Limiter BCS
Operator’s Handbook for detailed instructions.
• Complete the RCL console setup according to the
crane’s current operating configuration.
• Press limits LIM.
• Press 4 for slew angle/work area definition limits.
• Press 1 for slew angle.
• Press 2 or 3 to display slewing angle.
3. Remove the electrical swivel cover.
4. Disengage the house lock pin and swing the superstruc-
ture approximately 10 degrees to the right (clockwise).
Slowly swing back to the left and engage the house lock
pin.
NOTE: If the superstructure swings past the house lock pin
engaged position, step 4 must be repeated.
5. Loosen the three screws that secure the slew potentiom-
eter to the mounting plate.
6. Rotate the body of the slew potentiometer until the slew
angle indicates 0.6 ± 0.1 degree.
NOTE: The slew angle indication in step 6 may not be
obtainable due to limited wire length on the potenti-
ometer, or the electrical terminals interference with
one of the three mounting screws. If this occurs,
reposition the collar set screwed to the potentiome-
ter shaft and repeat steps 4 thru 6.
7. Tighten the three screws that secure the slew potentiom-
eter to the mounting plate. Install the electrical swivel
cover.
8. Disengage the house lock pin and swing approximately
10 degrees to the left (counterclockwise). Slowly swing
back to the right and engage the house lock pin.
NOTE: If the superstructure swings past the house lock pin
engaged position, step 8 must be repeated.
9. If the angle indicated on the console does not exceed ±
1.0 degree, proceed to step 10. If the indicated angle
exceeds ± 1.0 degree, return to step 3.
10. Disengage the house lock pin and swing approximately
10 degrees to the right (clockwise). Slowly swing back to
the left and engage the house lock pin.
NOTE: If the superstructure swings past the house lock pin
engaged position, step 10 must be repeated.
11. If the angle indicated on the console does not exceed ±
1.0 degree, proceed to step 12. If the indicated angle
exceeds ± 1.0 degree, return to step 3.
12. Disengage the house lock pin and swing approximately
10 degrees to the left (counterclockwise). Slowly swing
back to the right and engage the house lock pin.
NOTE: If the superstructure swings past the house lock pin
engaged position, step 12 must be repeated.
13. Verify the angle indicated on the console does not
exceed ± 1.0 degree. If the indicated angle exceeds ±
1.0 degree, return to step 3.
CAUTION
It is imperative that the slew potentiometer be adjusted
anytime work is done to the electrical swivel.
CAUTION
Do not attempt to rotate the slotted shaft in the center of
the slew potentiometer.
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