Lull 1044C-54 Series II Service Manual - Manual (Page 106)

Supply, Pressure, and Return Hydraulics
5-24 31200079
Replacement, Return Filter Element
(Ref. Fig. 5-15) The following procedure describes replacing the return
filter element.
1. To avoid contamination, place all parts on clean paper or cloth.
2. Loosen and remove lock nut (Item 1) that secures trestle (Item 2) to
filter element (Item 7).
3. Remove trestle and flatwasher (Item 3).
4. Loosen bypass spring assembly (Item 8) by turning it counter-
clockwise. Remove bypass spring assembly and tie rod (Item 6) from
filter element (Item 7). Discard contaminated filter element.
5. Remove and inspect two (2) trestle O-rings (Items 4 and 5). Clean
trestle and O-rings with solvent. Dry with compressed air. Lubricate
O-rings with hydraulic oil and install.
6. Clean washer, lock nut, bypass spring assembly, and tie rod with
solvent. Dry with compressed air.
7. Insert short end of tie rod (Item 6) through new filter element (Item 7).
Connect bypass spring assembly (Item 8) to end of tie rod. Tighten by
turning bypass spring assembly clockwise until snug and completely
engaged on tie rod.
8. Reassemble flatwasher (Item 3), trestle (Item 2), and lock nut (Item 1)
on other end of tie rod.
Reassembly, Return Filter Element
(Ref. Fig. 5-14) The following procedure describes installation of the return
filter element.
1. Loosen four (4) flange nuts (Item 2) enough so cover (Item 3) can be
removed from filter assembly head (Item 1). Twist cover clockwise so
that recessed areas of cover line up to flange nuts before removing it.
2. Inspect and clean cover O-ring (Item 4) and replace if necessary.
Lubricate O-ring with hydraulic oil and install on cover.
3. Insert filter element assembly (Item 6) into return filter housing
(Item 1).
4. Place spring (Item 5) so it rests vertically on top of trestle.
5. Place cover (Item 3) on filter assembly head making sure recessed
areas of cover line up with flange nuts.
6. Press down on cover until it can be rotated counter clockwise and slide
under flange nuts (Item 2). Torque flange nuts to 35 ft-lbs.