page 3–10
Constant Flow Jack Descent Rate Adjustment
Required Tools:
Bungee Cords
Adjustment Procedure:
1. Pump the litter up to full height
2. Lift the base hood, separating the Velcro holding it to the base frame.
3. The adjustable descent valve is located on the base of the jack and has a blue knob on the end. To adjust,
loosen the silver locking ring by turning it counterclockwise. Turning the blue knob clockwise will increase
the rate of litter descent. Turning it counterclockwise will decrease the rate of descent.
4. Adjust the valve so that the jack at the foot end of the stretcher will descend slightly faster than the jack
at the head end.
5. Remove the bungee cords supporting the base hood and secure the hood to the base frame.
Adjustable Pressure Compensated (P.C.) Valve Replacement
P.C. Valve Part Number 5050–70–50
WARNING
To avoid personal injury or damage to the stretcher, always remove the litter and the base hood before begin-
ning service on the jacks. Lower the jack rod completely to relieve the pressure on the pump piston side of
the jack.
Required Tools:
3/8” Wrench 13/16” Wrench
Replacement Procedure:
NOTE
It requires two people to safely perform this procedure.
1. Apply the stretcher brakes. Raise the litter to full up. Raise the Fowler and the siderails.
2. Using a 3/8” wrench, remove the bolts in the litter support tubes above the black bellows on both ends
of the litter.
3. With the assistance of another person, lift the litter off the base and set it aside, taking care not to damage
the leg section linkages and other litter components.
4. Push down on the jack actuator to put the jack in the full down position.
5. Lift off the plastic base hood, separating the Velcro holding it to the base frame.
6. Using a 13/16” wrench, remove the adjustable P.C. valve (see page 6–19 for part reference).
7. Check for any contaminants in the valve as well as in the jack base.
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