LIGHTING GP-FLOOD 3929881 - Caterpillar

Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact skin.
The return filter is a cartridge type filter. The amount of foreign material that enters the hydraulic system is reduced when the filter element is replaced.Two different filters are available for the return filter. One filter is used for standard applications such as digging and normal use of a hammer. The second filter is used for an application such as demolishing a ceiling in a tunnel with a hammer.Note: If the message display shows that the hydraulic return filter is plugged, turn off the machine. After you make sure that the warning has disappeared, start the machine and run the machine on level ground for approximately 10 minutes. If the warning still appears in the message display, inspect the filter and replace the filter, if necessary.
Illustration 1 g03656785
Remove bolts (1), washers (2), and cover (3) from the top of the hydraulic tank.
Clean the area thoroughly in order to keep dirt out of the return filter. Clean the area thoroughly in order to keep dirt out of the fill plug.
Illustration 2 g03656811
Slowly loosen the fill plug in order to release the pressure that may be present in the hydraulic tank.
After the hydraulic tank pressure is relieved, tighten the fill plug to 68 7 N m (50 5 lb ft).
Remove the filter. Perform Step 5.a through Step 5.h in order to remove the filter cartridge. Note: Refer to Operation and Maintenance Manual, "General Hazard Information" for information on containing fluid spillage.
Illustration 3 g02025079
(4) Bolts
(5) Washers
(6) Cover
(7) Filter cartridge
(8) Plug
Remove bolts (4), washers (5), and cover (6).
Remove plug (8) in order to release the pressure in filter cartridge (7). Note: When plug (8) is removed, the oil level in the return filter drops to the level of the hydraulic tank. The oil level should drop in approximately 1 minute.
Illustration 4 g01356402
(7) Filter cartridge
(9) Filter case
Remove filter cartridge (7) from filter case (9). Note: Do not tilt the filter cartridge. Oil may be spilled.
Illustration 5 g02722189
Remove snap ring (10).
The filter cartridge lid (11) is held in place by an O-ring. Pull up on the filter cartridge lid (11) and remove the lid from filter cartridge (7). Note: Inspect the O-ring located on the filter cartridge lid and replace if necessary.
Remove filter element (12) from filter cartridge (7).
Illustration 6 g02722219
Inspect cover (6) and O-ring (13). If either part is damaged, replace the part.
Inspect filter cartridge (7) for debris and for damage. If necessary, replace the filter cartridge.
Install the new filter element into the filter cartridge.
Install the filter cartridge lid (11) and snap ring (10). Note: Ensure that the O-ring on the filter cartridge lid (11) is seated properly and is not pinched.
Install the filter cartridge into the filter case.
Illustration 7 g01356439
(4) Bolts
(5) Washers
(6) Cover
Install cover (6), washers (5), and bolts (4). Tighten bolts (4) to a torque of 25 5 N m (18 4 lb ft).
Install cover (3), washers (2), and bolts (1).
Check the hydraulic system oil