Stryker Power Pro Cot 6500 RUGGED Manuel D'utilisation page 71

5. There is most likely air in the hydraulics.
a. Run the cot up and down several times.
b. There may not be enough hydraulic fluid in the system. See page 70 for instructions on filling the reservoir.
c. If the problem persists, go to section 11 b.
6. Tighten the nut at the bottom of the cylinder to approximately 60 ft-lb, using a 3/4" wrench to hold the cylinder while
tightening the nut.
a. Follow the procedure on page 18 to verify that the hall effects sensor is set properly.
b. Replace the hall effects sensor.
Note: An ESD (Electrostatic device) wristband must be worn when replacing the Hall Effect Sensor.
c. Replace the control board.
7. Excessive motor noise is caused by a faulty motor, misaligned coupling, or pump. The latter two are internal to the
hydraulics manifold. Please contact a service technician at (800) 327-0770 or (269) 324-6500.
8. Try the other set of switches. If this works, replace the first switch. If this doesn't work, the problem could be a faulty
B-valve solenoid, B-valve, cylinder, or control board. Replace these components in that order, trying the function
after each.
9. Make sure all the casters are on the ground and that the load wheels and foot end handles are not being supported.
Does the motor turn on?
a. NO: See page 67, number 4 and page 68, number 5.
b. YES: The problem could be a short in the cable to the pressure switch, a bad pressure switch or a sticking
hydraulic cylinder. Inspect and replace these components as necessary.
10. If unloading on an uneven surface, such as a curb or hill, the base may need to extend further than, or not as far as,
the set load height. If this is not the case, see number 7.
11. The problem is most likely with the rod-side manual valve or the A-valve.
a. Use the manual release lever to raise and lower the cot a couple of times.
b. Push the rod-side manual valve in by tapping the stem with a punch and hammer.
c. Loosen the manual release cable until it will no longer pull the valves. If this fixes the drift, re-adjust the
manual release cable until proper function is achieved (See page 70 for how to adjust the cable).
d. Replace the A-valve.
e. Replace the rod-side manual valve.
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Troubleshooting Guide
6500-009-005 REV A 69