Lull 6K Service Manual - Manual (Page 600)

Brakes
9-26 Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K
5. Remove piston (Item 9) by pushing it out with a bar from hydraulic end
of accumulator.
CAUTION: Never try to remove piston by applying compressed air to the
opposite end.
6. Remove two (2) Teflon rings (Item 8) from piston.
7. Remove two (2) backup washers (Item 10) from piston.
8. To remove V-ring (Item 11) from piston, lift it with a small, smooth
screw driver or similar tool. Move tool around the piston several times
while using the other hand to work ring off piston.
9. Remove hydraulic end cap (Item 14) from the accumulator body as
described in Step 4.
10. Remove O-rings (Items 5, 7, and 13) from gas valve and end caps
(Items 4, 6, and 14).
11. Discard O-rings, Teflon rings, backup washers, and V-ring.
12. Clean all remaining parts with solvent and dry with compressed air.
Clean bore of accumulator body with a clean, lint-free cloth soaked in
clean solvent. The bore must be clean of any visible particles or
particles detectable to touch.
13. Inspect piston for cracks, burrs around O-ring grooves, or any other
visible damage. Using a light, examine the body bore for scratches or
scoring. Inspect end caps for damaged threads or burrs on O-ring
grooves. Replace any damaged parts.
Note: Minor nicks, scratches, or light scoring of the body bore can be removed by
using crocus cloth. Dress bore until all apparent imperfections have been
removed.
Note: The two end caps (Items 6 and 14) and accumulator body (Item 12) cannot
be purchased separately. If these items become damaged, the entire
accumulator assembly must be replaced.
14. Obtain an accumulator repair kit to replace O-rings, Teflon rings,
back-up washers, and V-ring.
Note: Coat all internal parts with clean hydraulic fluid before reassembly.
15. Install new V-ring (Item 11) and two (2) backup washers (Item 10) (one
on each side of V-ring) on piston (Item 9).
16. Install two (2) new Teflon rings (Item 8) on piston.
17. Install piston (hollow side toward gas end) into bore of hydraulic end of
accumulator body (Item 12). Piston will fit snug. To avoid possible
damage, do not let V-ring drag on threads. The piston must go into the
bore exactly square and very slowly. The V-ring will compress as it
rides up the chamfer if done slowly. However, it may be damaged if
forced quickly.