Series 111 Accumulators
20
Maintenance
6. See
on page 19 for details A and B for this
step. Remove the end cap backup ring and seal (detail A), and the
piston seals and wear strip (detail B). Clean the cylinder with a soft
cloth and inspect the piston and inner walls for scratches. If the inner
walls of the cylinder are scratched to the extent that the piston seals
cannot seal properly, replace the entire accumulator.
7. Install a new piston seals, wear strip, new seal, and backup ring on
the end cap.
8. Apply a small amount of clean hydraulic fluid to the piston seals and
piston wear strip. Gently insert the piston into the cylinder with the
piston wear strip turned toward the hydraulic fluid port end, taking
care not to pinch the piston seals against the chamfered surface of the
cylinder. Ensure that the piston is aligned within the cylinder. Firmly
push the piston 2 to 3 inches (5 to 7 cm) into the cylinder.
9. Apply a small amount of clean hydraulic fluid to the end cap seal and
backup ring. Turn the end cap into the cylinder until the threads are
engaged.
Note
Do not overtighten the end cap.Tightening the end cap with extreme
force does not improve the seal and can damage the cap and/or cylinder
threads.Tighten the end cap using the following steps.
10. Hold the accumulator body with a strap wrench and use a pin spanner
wrench to rotate the end cap clockwise until the outer cap surface is
almost flush with the end of the cylinder and resistance indicates that
the cap and cylinder chamfer surfaces have met.
11. Thread the accumulator valve assembly into the end cap port. Use an
open-end wrench and tighten the valve assembly until the underside
of the hexagonal flange contacts the outer end cap surface.
12. Check the condition of the mounting O-rings on the boss adapter
fitting (Model 111.11B) or the flange mounting O-rings (Model
111.12C). If damaged, replace with new seals from the accumulator
seal kit.
