www.stryker.com 6390-009-002 REV D 31
Troubleshooting
Trolley does not lower smoothly when you press the extend (+) button
(Continued)
2. Close the docked/locked latch and use the trolley control panel to cycle the lifting arms up and down a few times
without a cot.
3. Check for proper operation of the support sensor (6390-001-452). Make sure that both switches have continuity
when weight of < 100 lb is applied.
a. If no continuity, replace the rod end assembly (6390-001-040).
4. Check for loose cable connections from the support sensors (6390-001-452) to the control board (6390–101–014).
Trolley hydraulic motor is noisy when you press the extend (+) or retract (-)
button
1. Make sure that the trolley hydraulics have sufficient oil in the reservoir when the 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.
2. Close the docked/locked latch and use the trolley control panel to cycle the lifting arms up and down a few times
without a cot.
3. Cycle the product up and down three to five times, especially if this problem occurs happens right after a repair.
4. Replace the motor (6390-101-132) on the hydraulic unit.
5. Replace the hydraulics assembly (6390-001-039).
Lifting arms do not lower cot low enough when you press the extend (+) button
Check the trolley control panel for errors.
If an error occurs when the lifting arms are loaded
1. The safety limit for loaded operation of the arms has been reached. This can happen at high load heights (>34 in.)
with heavy loads (>400 lb).
a. Check the support sensor (6390-001-452) or angle position sensor (APS) (6390-001-397) for damage.
If an error occurs when the lifting arms are unloaded or become unloaded
1. Make sure that the arms are not being held up on or by the cot legs.
2. Check for a broken angle position sensor (APS) (6390-001-397) or angle position sensor (APS) attachment
hardware.
3. Check for loose cable connections from the angle position sensor (APS) to the control board.
4. Replace the control board (6390-101-014).
Cot drifts down or goes into high speed retract when you press the retract (-)
button
1. Make sure that the trolley is on and functions without errors.
2. Make sure that the cot and trolley communication modules are connected, undamaged, and working properly.
a. Try the cot with a know good Power-LOAD.
b. Try the trolley with a known good cot.
3. Check all cable connections associated with communication leading back to the control board.
4. Replace the communication board (6390-001-378 or 6500-002-100).
5. Replace the control board assembly (6390-101-014 or 6500-002-014).
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