2. If the trolley motor is not audible:
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, communication may be the problem.
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, contact Stryker Technical Support for advanced
troubleshooting.
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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).
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1. Check for proper operation of the support sensor (6390-001-452). Make sure that both switches have continuity when
you apply weight < 100 lb 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).
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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).
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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.
NNoottee -- The oil level should be just below the fill port.
6390-309-002 Rev AB.0 21 EN
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