Lull 6K Service Manual User Manual
Page 292
Boom and Transfer
6-42
Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K
6. Remove O-rings and backup rings (Items 11, thru 15) from solenoid
cartridge. Discard O-rings and backup rings.
7. Repeat Step 4 thru Step 6 for the other solenoid valve assembly.
8. Clean all remaining parts with solvent and dry with compressed air.
Visually inspect the valve body to make sure all cavities are free of
contamination including burrs and chips as well as pieces of O-rings.
Inspect for all parts for damage and contamination; replace as
necessary.
Note: The name plate (Item 2) and valve body (Item 10) are not sold separately.
Should these items need replacement, it will be necessary to purchase a
complete solenoid valve assembly.
9. Obtain seal kit. Lubricate each O-ring and backup ring before installing
it.
10. Install O-rings and backup rings installed in descending order on each
solenoid cartridge (Item 16). Install largest O-ring (Item 15) against the
hex of the solenoid cartridge. Install O-ring (Item 14) and backup ring
(Item 13) near the center of the solenoid cartridge. Install backup ring
(Item 12) and O-ring (Item 11) near the end of the solenoid cartridge.
11. Check cartridges for any visible contamination. Dip each cartridge in
clean oil up to the O-ring (Item 15) before installing it in the valve body.
12. Install cartridges on valve body (Item 10). Torque each cartridge to
35–40 ft-lbs.
13. Install cover plate (Item 5), solenoid coil (Item 4), coil housing (Item 3),
name plate (Item 2), and nut (Item 1) on each solenoid cartridge.
Torque nut to 4–6 ft-lbs.
CAUTION: Maintain a 4–6 ft-lbs. maximum torque on valve tube nut
(Item 1). Overtightening may cause valve failure.
14. Install two (2) orifices (Item 9) in valve body. Torque orifices to
30–40 in-lbs.
15. Install two (2) O-ring plugs (Item 8) in valve body. Torque plugs to
210–230 in-lbs.
16. Install elbows (Item 7) in ports P1, P2, A1 and B1 of valve body. Torque
elbows to 160–180 in-lbs.
17. Install long elbows (Item 6) in ports B3 and A3 of valve body. Torque
elbows to 160–180 in-lbs.