Service Information
22
HYDRAULIC PRESSURE HOSE REPLACEMENT
40” Hose Part Number 1550−71−1 36” Hose Part Number 1550−71−7
Required Tools:
Large Phillips Screwdriver 9/16” Open End Wrench 11/16” Open End Wrench
6” 3/8 Drive Extension 3/8” Drive Ratchet Paper Towels or Rags
String or Bungee Cord Modified Flair Nut Wrench − p/n 1550−570−5
Procedure:
1. Raise the litter to the full up position. Unplug the stretcher power cord from the wall socket.
NOTE
If the hydraulic system is completely disabled, manually lift up on the litter to raise the jack actuator.
2. Remove the four Phillips head screws securing the base hood to the base frame. Lift the hood and secure
it to the litter using string or bungee cords. Use caution when lifting the hood so none of the wires leading
to the litter are pulled loose.
3. Locate the black pressure hose leading from the top of the jack casting to the head of the pump. Using
a 9/16” open end wrench, remove the hose from the 90 fitting. Before removing the hose from the jack
base, pack a paper towel or rag around the fitting to soak up the hydraulic oil that will run out of the hose.
Using the modified flair nut wrench, loosen the hose fitting and remove the hose.
4. To install the new hose, pass it behind the jack brace and thread it onto the jack base fitting.
CAUTION
Do not over−tighten the fitting. Thread the brass nut by hand and tighten approximately 60 or one flat of
the nut.
5. Attach the other end of the hose to the pump and tighten as described above. If the hose is tight or
stressed, it may be necessary to change the angle of the fitting on the pump. Using an 11/16” open end
wrench, loosen the nut against the pump 1/2 turn, reposition the fitting and tighten the nut. Remove the
paper towel or rag used to soak up the hydraulic oil.
6. Replace the hydraulic oil lost when the hose was removed. Remove the filler plug and add approximately
1 ounce of Mobil AW−32 hydraulic oil (Stryker part number 1550−570−10). Do not fill to the bottom of the
fill hole because most of the oil is in the actuator cylinder when the litter is raised.
7. After the new hydraulic hose or hoses have been installed, plug the stretcher power cord into a properly
grounded wall receptacle. Cycle the litter up and down approximately 10 times and inspect the hose(s)
and fittings for leaks.
8. Before installing the base hood, inspect all the wires and connectors and Verify none has pulled loose.
Position the hood being sure no wires are hanging out or pinched. Replace the four screws to secure the
hood.
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