Lull 6K Service Manual - Manual (Page 180)

Supply, Pressure, and Return Hydraulics
5-36 Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K
3. While watching test gauge, press brake pedal numerous times until
pressure gauge reads 0 psi. Remove test gauge from diagnostic port.
4. For models 644B, 844C, and 1044C, refer to roll-back hose tray
removal procedures on page 5-92.
5. Thoroughly clean the hydraulic pump (Item 15) to ensure that dirt will
not get into the system/transmission.
6. Tag and slowly loosen four (4) hydraulic hoses (Items 5, 6, 12, and 13)
and bleed any remaining oil. Disconnect hoses. Cap fittings and hoses.
7. Take note of how fittings are attached to the pump. To make sure they
are reassembled in the same position, make sketches of the two (2)
adjustable 45° O-ring elbows (Item 14).
8. Remove four (4) each capscrews (Item 2) and lockwashers (Item 3)
holding the two (2) flange halves (Item 4) that secure the flange head
connector (Item 1) to the hydraulic pump (Item 15). Remove the flange
halves.
9. Plug the port on the elbow (Item 1) and tie up the elbow to ensure that
fluid from the hydraulic tank does not spill.
CAUTION: Before loosening capscrews that secure the hydraulic pump to
the transmission (Item 11), support the pump to ensure that it
does not twist or fall.
10. Remove two (2) each capscrews (Item 7) and lockwashers (Item 8).
11. Pull the pump straight out from the transmission and take it to an
appropriate area for further inspection.
CAUTION: To avoid contamination of system, cap hoses and cover
opening on transmission after pump is removed.