Lull 6K Service Manual - Manual (Page 615)

Brakes
Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K 9-41
Models with Horizontal Cylinder Mount
644B-37 (S/N 101–383)
644B-42 (S/N 101–119)
844C-42 (S/N 101–281)
1044C-42 (S/N 101–106)
1044C-54 (S/N 101–102)
6K-37 (S/N 101–211)
6K-42 (S/N 101–105)
8K-42 (S/N 101–162, 165)
10K-42 (S/N 101–106) The park brake cylinder used on models with a horizontal cylinder mount
includes a clevis and jam nut whose position can be adjusted (see
Fig. 9-21). As the brake shoes wear, the position of these two items will
need to move closer to the end of the threaded portion of the cylinder rod.
If adjustment of the clevis location is inadequate, modifications may also
be made to the adjustable link assembly. As the brake shoes wear, it will
become necessary to select mounting holes further away from the top end
of the adjustable links when connecting them to the bell crank.
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. Remove cotter pin (Item 9) from clevis pin (Item 10). While holding the
brake cam (Item 15) up, remove clevis pin from clevis (Item 8).
Note: With the park brake cylinder (Item 5) fully extended and the brake cam
(Item 15) raised 1/16–1/8” from its lowest possible position, it should be
possible to insert the clevis pin (Item 10) directly into the clevis (Item 8) and
through the bell crank (Item 11).
6. If it appears to be possible to meet these guidelines, go directly to
Step 8. If it does not appear to be possible to meet these guidelines,
continue with Step 7
7. To make a link adjustment, perform the following steps:
a. Remove cotter pin (Item 19) and flatwasher (Item 12) from clevis
pin (Item 18).
b. While holding brake cam (Item 15) up, remove the clevis pin
securing two (2) adjustable links (Item 13) to bell crank (Item 11).
c. Choose suitable matching hole locations in adjustable links to
remove excess play in system.
d. While holding brake cam (Item 15) up, attach adjustable links to
bell crank with clevis pin.
e. Secure clevis pin with washer and new cotter pin.
8. To properly position the clevis, perform the following steps:
a. Make any necessary adjustments in the position of the clevis on
the cylinder rod to meet the guidelines described in the above note.
b. Insert clevis pin in clevis and through mounting hole in bell crank.
Install cotter pin in clevis pin.