Stryker Medical 1050, Maintenance Manual

Page: 17 / 108

Service Information
12
HYDRAULIC CHECK VALVE REPLACEMENT – NON–ELECTRIC LIFT BASE
Required Tools:
3/8 Box End Wrench Stiff Wire (with bent, pointed end) Small Needle Nose Pliers
3/4 Open End Wrench Torque Wrench (with Ft. Lbs. adjust.)
7/32 Hex Allen Wrench 1/2 Inch Diameter Rod
Replacement of Valve #1
WARNING
To avoid personal injury or damage to the stretcher, remove the litter and the base hood before beginning
service on the jacks. Lower the jack rod completely to relieve the pressure on the pump piston side of the
jack. This will prevent large hydraulic fluid loss and possible damage when the base plugs are removed.
1. Using a 3/8 box end wrench, remove square head set screws from both head and foot end jack support
tubes. Remove litter top and set aside.
2. Lift base hood off base frame and set aside.
3. Lower jack to full down position. The actuator must be manually lowered while depressing the appropriate
release pedal.
4. Remove the pin body assembly (4) with a 3/4 open end wrench and discard the housing gasket (5).
NOTE
Although the hydraulic fluid is not under pressure, some fluid loss will occur. The fluid loss should be minimal
but covering the floor is advisable.
5. Using a 7/32 hex Allen wrench, remove the valve plug (6).
6. Using a stiff wire with a bent pointed end, remove and discard the valve (1) and the seal (7).
7. Install the new seal (7) flat to the bottom of its hole with a 1/2 inch diameter rod and install the new valve
(1) with the beveled end out (as shown in the illustration).
8. Install the valve plug (6) with the countersunk end first and the beveled end out. Tighten to 10 ft.–lbs torque.
9. Install the pin body assembly (4) with the new housing gasket (5) and tighten to 10 foot–pounds torque.
10. Pump up the jack to the maximum height. Apply weight to be sure the jack holds its position and there
are no hydraulic leaks before replacing the base hood and the litter.