Stryker Medical 2025, Maintenance Manual

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Maintenance Procedures – Base
8
CHECKING HYDRAULIC FLUID LEVEL
Required Tools:
3/16” Allen Wrench 3/4” Open End Wrench (2) Sawhorses (or equivalent)
Large Phillips Screwdriver Bungee Cords (or equivalent) Hydraulic Fluid
Procedure:
1. Raise the litter to the full up position.
2. Using a sawhorse or the equivalent, support the end of the litter needing service.
3. Using a 3/16” Allen wrench, remove the socket head cap screw from the litter support tube at the end of
the bed needing service.
4. Press down on the release pedal for the end of the bed you are working on and, at the same time, push
down on the jack actuator until it is fully down.
5. Using a #2 Phillips screwdriver, remove the three Phillips screws holding the base hood to the base frame.
6. If the bed is equipped with the 110V outlet option, remove the slotted screw holding the outlet cover. If
the bed does not have the 110V outlet option, remove the two slotted screws holding the cover plate.
7. Using bungee cords or the equivalent, lift and support the base hood high enough to access the fill plug
on the side of the jack.
8. Verify there are no hydraulic leaks. If there are, jack replacement will be necessary.
9. Using a 3/4” open end wrench, slowly turn the fill plug counterclockwise to allow excess system pressure
to vent. Remove the fill plug.
10. The hydraulic fluid should be visible at the bottom of the fill hole. If it is not, add Mobil AW–32 hydraulic
fluid (Stryker part number 1550–570–10) until the fluid is visible at the bottom of the fill hole. Replace the
fill plug.
CAUTION
Use of other types of oil may damage hydraulic units.
11. Replace the base hood and reattach the litter support tube.
BLEEDING AIR FROM THE HYDRAULIC SYSTEM
If the lift motion is jerky or sluggish when the ”BED UP” button is pressed or when the lift pedal is pumped,
and/or the litter does not hold when it is pushed down, there may be air in the hydraulic system. This may
have been caused when the bed was unloaded from the shipping carton if it was lifted out by the litter instead
of by the brake rings.
1. To bleed air from the hydraulic system, raise the litter to full up using the lift pedal and continue to pump
10–12 times after full up is reached.
2. Lower the bed using the foot release pedals. While continuing to hold the release pedals down, pump the
lift pedal an additional 10–12 times.
3. Repeat the procedure 2–3 times or until the bed motion is smooth and the pedal action is firm.