Stryker Stretcher 721

Apply the stretcher brakes. Raise the litter to full up. Raise the Fowler and the siderails.

Using a 3/8” wrench, remove the bolts in the litter support tubes above the black bellows on both ends of the litter.

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.

Push down on the jack actuator to put the jack in the full down position.

Lift off the plastic base hood, separating the Velcro holding it to the base frame.

Using a 13/16” wrench, remove the adjustable P.C. valve.

Check for any contaminants in the valve as well as in the jack base.

Install the replacement P.C. valve. Moisten the O-ring seal with hydraulic fluid to ensure a tight seal.

Tighten the valve manually and then an additional 1/8-1/4 turn with a 13/16” wrench. Do not overtighten or damage may occur to the O-ring seal.

Pump the litter up to full height

Lift and support the base hood using string or bungee cord

Remove the cotter pins from both jack pump pistons and the pump linkage using pliers

Remove the two bearing plate bolts using the 9/16” box end wrenches

Remove the cotter pin on the side brake bar

Remove the bearing plate and pull out the idler gear rod while holding onto the gear. Lift the gear out

Slide the miter gear away from the rod spacer and remove the dowel pin

Raise the side of the base you are working on approximately four inches using the floor jack

Pump the litter up to full height

Lift the base hood and support it from the litter frame using bungee cords

Using a 9/16” wrench, remove the two side bolts on the cam adjuster block

Release the brakes and engage the big wheel

Adjust the two top bolts on the adjuster block equal amounts so the foot end casters are raised off the floor 1/4”. Reinstall the two side bolts on the cam adjuster block after applying Loctite to both bolts

Remove the bungee cords and reinstall the base hood

Verify the brake and steer functions are working properly before returning the bed to service

Remove the four Phillips screws holding the base hood to the frame

Lift and support the base hood using string or bungee cord

Put the brake/steer pedal in the neutral position

Lift the end of the base needing service until the casters are approximately 12” off the floor and support it with a jack or the equivalent

Using a 3/32” Allen wrench, loosen the set screw holding the brake adjuster to the brake ring and turn the adjuster clockwise to remove it

Remove the caster covers on both casters

Remove one of the caster assemblies

On the other caster, use an 11/16” socket and ratchet and a 5/8” wrench to remove the nut and bolt holding the wheel on the caster horn and remove only the wheel

Using needle-nose pliers, carefully squeeze and remove the spring between the brake cam and the brake ring

Replacement caster and caster nut installed

Enter the torque applied to the caster nut

Is the new caster assembly with a 3M patch?

If the caster is removed and reassembled for any reason, apply Loctite 242 to two or three threads of both the bolt and caster nut.

Loctite 242 applied to the bolt and caster nut

Enter the torque applied to the bolt and caster nut after Loctite application

Sign off on the caster assembly replacement