5-18. HOOK ARM HYDRAULIC TUBE (MAIN FRAME) REPLACEMENT (continued).
Steps 2 through 4 are to relieve main frame cylinder pressure. Main frame
cylinder should move freely when pressure is relieved.
It may take two to three minutes before pressure is relieved.
(2) Turn engine switch (3) to ON position.
(3) Turn light control switch (4) to STOP LIGHT position.
(4) Turn LHS selector switch (5) to no. 1 position.
MODEL A SHOWN