Lull 6K Service Manual - Manual (Page 153)

Supply, Pressure, and Return Hydraulics
Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K 5-9
7. Start engine and allow hydraulic system to warm up. Operate controls
gradually until you fully extend and retract each cylinder, including
steering cylinders. This procedure removes air from the system.
8. Level the frame, retract all cylinders except frame tilt cylinder, and stop
the engine. Recheck oil level and add oil as required.
9. Loosen and remove hose (Item 3) from reservoir filler fitting (Item 4).
Install hex cap (Item 1) and torque to 70 ft-lbs.
Filling Hydraulic Reservoir
Alternate Method
CAUTION: Do not fill reservoir through breather opening. The hydraulic
system can become contaminated.
Oil must be filtered through the return filter to ensure purity.
Contamination, even small amounts, can permanently damage hydraulic
system components and void the warranty.
Fig. 5-7: Alternate Reservoir Filling Method
(Ref. Fig. 5-7) The following is an alternate filling procedure for the
hydraulic reservoir.
K
1016
2
1
3
4
5
# Description
1 Return Filter Housing
2 Flange Nut
3 Cover
# Description
4 Spring
5 Hydraulic Filter Element