Service Information
19
JACK/MOTOR REPLACEMENT − ELECTRIC LIFT BASE
NOTE
When replacing the foot end jack, the motor does not need to be removed.
Required Tools:
Large Phillips Screwdriver String or Bungee Cord Sawhorses (or equivalent)
1/2” Socket w/6” Extension 1/2” Box End Wrench 1/4” Allen Wrench
3/8” Box End Wrench Small Standard Screwdriver Modified Flair Nut Wrench (p/n
1550−570−5)
Procedure:
1. Unplug the power cord from the wall socket. Press fully down on the brake pedal to set the brakes. Pump
the lift pedal and fully raise the litter. Remove the four Phillips screws holding the base hood to the frame.
Lift and support the base hood using string or bungee cord. Using sawhorses or the equivalent, support
the litter at the end of the stretcher that needs service.
2. Using a 3/8” box end wrench, remove the screw holding the jack to the litter support tube.
3. Press down on the release pedal for the end of the stretcher being serviced, and, at the same time, push
down on the jack actuator until it is fully down.
4. Put the brake/steer pedal in neutral and move the end of the base being serviced out from under the litter
to allow better access to the jack and motor. Press fully down on the pedal to reset the brakes.
WARNING
Move only the base. Be very careful not to move the litter. Personal injury could result if the litter falls off
the sawhorses (or equivalent) supporting it.
5. Using a 1/2” socket and a 1/2” wrench, remove the nuts and bolts holding the jack support bracket on both
sides of the jack. Using a 1/2” socket, remove the two nuts and bolts holding the support bracket on the
base tube bracket.
6. Properly ground yourself (see page 11). Disconnect the motor cables.
7. Using a 1/2” ratchet with a 6” extension and a 1/2” wrench, remove the four nuts and bolts holding the jack,
motor, and enclosure on the base frame,
8. Using a 1/4” Allen wrench and a 1/2” box end wrench, remove the nut and bolt holding the jack pump piston
to the linkage. If you are replacing the head (control) end jack, remove the nut and compress the jack
spring before removing the bolt. Carefully release the spring and remove it from the spring holder.
9. Pull out the jack and motor.
10. Using the modified flair nut wrench (p/n 1550−570−5), disconnect the hydraulic pressure hoses.
11. If the capacitor needs to be replaced, use a small, standard screwdriver to remove it from the bracket
on the bottom of the enclosure.
12. Place the new jack/motor assembly in the enclosure. Reinstall the jack support brackets. Reinstall the
jack pump piston to the linkage.
13. Line up the enclosure and motor with the holes in the base frame and reinstall the four nuts and bolts.
14. If the capacitor is being replaced, push the new capacitor into the bracket inside the enclosure. Connect
all wires and cables.
15. Be sure the jack actuator is in the full down position and remove the fill plug on the side of the jack actuator.
The hydraulic fluid should be visible at the bottom of the fill hole. If it is not, fill the jack with hydraulic fluid
(Stryker part number 1550−570−10) until the fluid is visible at the bottom of the fill hole.
16. Reinstall fill plug, plug stretcher power cord into a properly grounded wall receptacle and run the jack up
and down electrically. Remove the fill plug and add more hydraulic fluid, if necessary. Repeat this step
two or three times.
17. Pump the lift pedal to raise the jack actuator and reattach the jack to the litter support tube. Reattach
the base hood. Test the lift functions before returning the stretcher to service.
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