Lull 6K Service Manual - Manual (Page 540)

Frame Tilt and Oscillation
7-38 Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K
3. Install two (2) SAE #2 plugs (Items 8 and 34). Torque plugs to
30–40 in-lbs.
Note: Models with mid-inlet hydraulics do not have the SAE #2 plug (Item 8).
4. Install SAE #4 plug (Item 19). Torque plug to 125–145 in-lbs.
5. Install SAE #10 plug (Item 20). Torque plug to 71–79 ft-lbs
(850–950 in-lbs).
6. Obtain new O-rings and backup rings for pressure reducing cartridge
(Item 28), two (2) check valve cartridges (Item 21), two (2) pilot pistons
(Item 25), and solenoid valve (Item 14). Lubricate all O-rings and
backup rings with hydraulic oil before installing on components.
Pressure Reducing Cartridge 7. Install large O-ring (Item 29) on pressure reducing valve cartridge
(Item 28).
8. Install backup ring (Item 30) and O-ring (Item 31) on cartridge so
backup ring is behind O-ring as shown in Fig. 7-22. Note that backup
ring and O-ring (Items 30 and 31) are slightly larger in diameter than
Items 32 and 33.
9. Install two (2) backup rings (Item 32) and O-ring (Item 33) on cartridge
so O-ring is between backup rings as shown in Fig. 7-22.
10. Lubricate all O-rings and backup rings on pressure reducing cartridge
(Item 28). Install cartridge and torque to 270–300 in-lbs.
Solenoid Valve 11. For models with control manifold hydraulics,
a. Install large O-ring (Item 13) on solenoid valve (Item 14).
b. Install two (2) backup rings (Item 11) and O-ring (Item 12) on
solenoid valve so O-ring is between backup rings as shown in
Fig. 7-22.
Note: The backup rings and O-ring (Items 11 and 12) are slightly larger in
diameter than Items 9 and 10.
c. Install two (2) backup rings (Item 9) and O-ring (Item 10) on
solenoid valve so O-ring is between backup rings as shown in
Fig. 7-22.
d. Lubricate all O-rings and backup rings on solenoid valve (Item 14).
Install solenoid valve and torque to 215–240 in-lbs.
e. Install solenoid coil (Item 15) on solenoid valve so lettering is away
from block body. Install nut (Item 16) and torque to 55–60 in-lbs.
12. Install two (2) backup rings (Item 26) and O-ring (Item 27) on each pilot
piston (Item 25) so O-ring is between backup rings. (Ref. Fig. 7-22).
13. Lubricate backup rings and O-ring on each pilot piston (Item 25) and
install pistons in block body. Tapered end of pistons must face out as
shown in Fig. 7-22.
14. Install large O-ring (Item 22), O-ring (Item 23), and backup ring
(Item 24) on each check valve cartridge (Item 21). Follow assembly
sequence shown in Fig. 7-22.