Lull 6K Service Manual - Manual (Page 596)

Brakes
9-22 Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K
5. Record the lowest pressure observed before the accumulator
recharges. The pressure should be 950–1200 psi. This reading is the
accumulator recharge pressure.
6. Shut the engine off.
7. Slowly pump the brake pedal while closely watching the pressure
gauge.
8. Record the lowest pressure observed before the pressure drops to
nearly zero. This reading is the nitrogen pre-charge. This pressure
should be 375–425 psi.
9. If either of the recorded readings are outside the recommended
ranges, contact the JLG Service Department.