30 6390-009-002 REV D www.stryker.com
Troubleshooting
Lifting arms do not lower, but the cot legs extend when you press the extend (+)
button (Continued)
a. Check the motor and voltage to the motor. If voltage is present, replace the motor (6390-101-132).
b. Check the motor and voltage to the motor. If voltage is not present, replace the motor cable (6390-101-431) or
the control board assembly (6390-101-014).
c. Run the lifting arms down using the trolley control panel. If the product lowers, the problem is likely with
communication. Check both sides of the communication link. Replace the communication boards (6390-001-
378 or 6500-002-100) as necessary.
3. If the trolley control panel LED error indication is illuminated, call Stryker Service for advanced troubleshooting.
Lifting arms lower, but the cot legs do not extend when you press the extend (+)
button
1. Make sure that the cot battery has sufficient power to drive the cot (no amber battery indicator).
2. Check to see if the cot pump motor is audible.
a. If yes, the problem is with the cot hydraulic unit.
b. If no, check for error codes on the cot LCD.
c. Check all cable connections at the control board and hydraulic unit.
d. Replace the cot control board (6390-101-014).
e. Replace the cot hydraulics assembly (6500-001-030).
f. Replace the cot main cable (6500-002-159).
Lifting arms lower cot too quickly when you press the extend (+) button
1. Check for proper operation of the support sensor (6390-001-452). Make sure that both switches have continuity
when weight < 100 lb is applied to the lifting arms.
a. If there is no continuity, replace the rod end assembly (6390-001-040).
2. Check for loose cable connections from the support sensors (6390-001-452) to the control board (6390–101–014).
Lifting arms lower the cot too slowly when you press the extend (+) button
1. Check the trolley control panel LEDs for low battery indication.
2. Check for false closure of the velocity fuse.
3. Raise the cot using the trolley control panel. Determine if the cot lowers at the correct rate.
a. If the cot does not raise, check for loose or bad trolley pump motor connection.
4. Lower the cot using the trolley control panel.
a. If yes, replace the hydraulic velocity fuse (6390-001-381).
b. If no, replace the motor (6390-101-132).
Trolley does not lower smoothly when you press the extend (+) button
1. Make sure that the trolley hydraulics have sufficient oil in the reservoir when lifting arms are all the way down. Look
for any leaks and repair, if necessary.
Note: The oil level should be just below the fill port.
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