Lull 6K Service Manual - Manual (Page 176)

Supply, Pressure, and Return Hydraulics
5-32 Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K
1. Follow preparation procedures as outlined in Section 3 of this manual.
Be sure to follow the guidelines in this section detailed under “General
Hydraulic Maintenance Practices” on page 5-4.
2. For models 644B, 844C, and 1044C, refer to roll-back hose tray
removal procedures on page 5-92.
3. Clean the hydraulic pressure assembly to avoid contamination of the
system while removing the hydraulic pressure filter assembly.
4. Tag and slowly loosen the two (2) 90° O-ring hose elbows (Items 4
and 6) from the pressure filter assembly and bleed any remaining oil.
Cap fittings.
5. While securing the hydraulic pressure filter assembly (Item 5), loosen
and remove the four (4) each capscrews (Item 2) and lockwashers
(Item 3) that connect the pressure filter assembly to the filter mounting
bracket (Item 1).
6. Remove the pressure filter assembly from the hole in the filter
mounting bracket.
Installation
Pressure Filter Assembly (Ref. Fig. 5-22) The following procedure describes installation of the
hydraulic pressure filter assembly.
1. Insert the pressure filter assembly through the hole in the filter
mounting bracket, making sure that the bypass indicator is closest to
back of the mounting bracket.
2. Secure the pressure filter assembly to the mounting bracket with the
four (4) each capscrews and lockwashers. For final tightening, torque
the capscrews to 75 in-lbs.
3. Connect the two (2) elbows (Items 4 and 6) to the pressure filter
assembly. For final tightening, torque to 75–85 ft-lbs.
4. For models 644B, 844C, and 1044C, refer to roll-back hose tray
installation procedures on page 5-96.