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ADJUSTABLE PRESSURE COMPENSATED (P.C.) VALVE REPLACEMENT (HYDRAULIC BASE)
TOOLS REQUIRED:
• 13/16 in. Combination Wrench
• (2) Bungee Cords (or equivalent)
PROCEDURE:
Note
Unless otherwise indicated, refer to Figure 11
1.
Raise the rails to the highest position and lower the litter to the lowest height. Apply the brakes.
2.
Lift the base hood, separating the Velcro fasteners holding it to the base, and support it using bungee cords.
Note
The jack must be completely lowered to relieve the pressure on the pump piston side of the jack.
3.
Using a 13/16 in. combination wrench, remove the adjustable P.C. valve (N).
4.
Check for any contaminants in the valve and in the jack base.
5.
Install the new P.C. valve. Moisten the O-ring seal with hydraulic fluid to ensure a tight seal.
6.
Tighten the valve by hand and then add an additional 1/8 to 1/4 turn with a 13/16 in. combination wrench.
CAUTION
Over-tightening the P.C. valve may cause damage to the valve itself, the O-ring seal, or the jack base.
7.
Pump the jack to the highest position. Apply weight to the stretcher and ensure the jack holds. Verify there are no
hydraulic leaks.
8.
Remove the bungee cords and replace the base hood.
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1-40
Service
(see page 1-36)
for this procedure.
1900-009-002 REV B
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