Lull 6K Service Manual - Manual (Page 611)

Brakes
Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K 9-37
1. Follow preparation procedures as outlined in Section 3 and in
Section 5 of this manual.
2. Block the wheels and make sure the park brake is released.
3. Install a brake pressure diagnostic port test gauge to the hose into the
brake diagnostic port.
4. While watching test gauge, press brake pedal numerous times until
pressure gauge reads 0 psi. Remove test gauge and cap diagnostic
port.
5. Slowly loosen hydraulic brake hose (Item 3), bleed any remaining oil
into appropriate container, and disconnect hose from elbow (Item 4).
6. Remove cotter pin (Item 9) from clevis pin (Item 10). While securing
the brake cam in the up position and rotating the bell crank (Item 11)
towards the park brake cylinder (Item 5), remove clevis pin from clevis
(Item 8).
7. Remove the cotter pin (Item 1) and brake cylinder pin (Item 2) securing
the park brake cylinder to the park brake cylinder mount (Item 28).
Remove park brake assembly.
8. Remove adjustable link assembly (Items 12–19) as follows:
a. Remove cotter pin (Item 19), flatwasher (Item 12), and clevis pin
(Item 18) that secure two (2) adjustable links (Item 13) to bell crank
(Item 11).
b. Remove cotter pin (Item 17), flatwasher (Item 14), and clevis pin
(Item 16) that secure two (2) adjustable links to brake cam
(Item 15).
9. Remove bell crank assembly (Items 11, 20, 21, and 24–27) as follows:
a. Remove retaining ring (Item 27), shim(s) (Item 26), and flatwasher
(Item 25) from bell crank.
b. Remove bell crank and remaining shim(s) (Item 20) from park
brake cylinder mount (Item 28).
c. Remove two (2) bushings (Items 21 and 24) from block portion of
park brake cylinder mount.
10. Take the park brake assembly, along with other disassembled parts, to
an appropriate place for further inspection and cleaning.
11. Remove the elbow (Item 4), clevis (Item 8), lockwasher (Item 7), and
jam nut (Item 6) from park brake cylinder.
12. Discard the park brake cylinder, bushings, and cotter pins. Clean all
remaining parts with appropriate solvent; inspect and replace as
necessary.