Stryker Medical 1050, Maintenance Manual

Page: 27 / 108

Service Information
22
FOWLER LIFT MOTOR/ACTUATOR REPLACEMENT (CONTINUED)
5. Using a screwdriver, pry off the ball retainers at each end of the black gas cylinder and remove the gas
cylinder. Using a 5/32” Allen wrench, remove the screws (B) holding the stop (C) on each side of the Fowl-
er tube (D). Trip the Fowler quick drop lever on the end of the actuator* and at the same time manually
lift the Fowler. Use string or cord to secure the Fowler out of the way.
CAUTION
*Do not use the red quick drop release handle because the Knee Gatch will come down.
6. Using two 1/2” wrenches or sockets, remove the two nuts and bolts from each side of the ”Y” shaped Fowler
bracket at the head end of the stretcher. Hold the Fowler lift motor tube (D) so it does not fall and damage
the storage tray.
7. Using a 7/16” wrench, remove the two inner nuts and bolts fastening the motor to the mounting brackets
inside the motor/board enclosure at the foot end of the stretcher. Only the two inner bolts need to be re-
moved.
8. Using a 5/16” ratchet and extension, remove the two screws from the bottom mounting bracket under the
actuator assembly. Support the foot end of the stretcher using a sawhorse or the equivalent. Using a 1/2”
wrench or socket, remove the bolt holding the litter support tube on top of the jack to the litter roller assem-
bly and swing the litter support aside. Using a 7/16” socket, remove the bolt holding the foot section to
the Gatch motor tube and pivot the foot section completely back.
9. Pull the ”Y” shaped bracket off the end of the lift motor tube and remove the actuator assembly from the
enclosure. Install the new actuator assembly and the two screws in the bottom mounting bracket. Install
the two inner bolts to the motor mounting brackets. Reattach the litter support tube to the litter roller as-
sembly. Reattach the Gatch motor tube to the Gatch. Lift the Fowler and install the ”Y” shaped Fowler
bracket onto the end of the Fowler motor tube. (It will be necessary to trip the quick drop latch). Grease
the motor tube, if necessary. Install the two stops (E) on the sides of the Fowler motor tube using the
screws and adhesive provided with the new actuator.
10. Install the gas cylinder with the large diameter end toward the foot end of the stretcher. Install the small
(head) end first, then move the Fowler until the foot end of the cylinder can be popped on. Plug the black
motor cable into the logic circuit board and plug the stretcher power cord into a properly grounded wall
receptacle. Inspect and test the lift and quick drop systems. (Trip the quick drop at the latch under the
Gatch. Do not attach the cable yet.) If the Fowler or Gatch do not lower or raise properly and the limit
switches need to be adjusted, see the procedure on page 24.
11. Insert the cable outer cover into the Fowler actuator bracket and secure it with the set screw. Thread the
cable through the quick drop release lever on the actuator then through the cable cover and the release
lever. Keep the cable taut between the two washers on the release lever (but not holding the latch open)
and tighten the nut and bolt holding it in place. Rotate the red lever to test the quick drop function for proper
operation. Glue the black cap on the end of the cable.
12. Reinstall the enclosure cover and Knee Gatch guides with the four socket head cap screws. When rein-
stalling the Knee Gatch guides, be sure the large hole in the guide is toward the foot (crank) end with the
ridged side of the guide facing out. Install the two sheet metal screws. Inspect and test the stretcher before
returning it to service.