SCREW 1R9864 - Caterpillar

Illustration 1 g01630955
(1) Pressurized oil
(2) Pressurized gas The accumulator stores potential energy by accumulating a quantity of pressurized hydraulic fluid. The pressurized fluid is stored in a piston type accumulator. The pressurized fluid enters the accumulator into cavity (1) and the fluid creates pressure against the piston and the charged dry nitrogen. Cavity (2) contains dry nitrogen.The accumulator is used as an aid for the quick-drop function. In order to activate the quick-drop function, the quick-drop button must be pressed and held DOWN. When the quick drop valve is activated, stored pressurized oil from the accumulator is used to facilitate faster activation of the quick-drop clutch especially during cold ambient conditions.The accumulator is also used in order to lower the hook in the event of a dead engine. In order to lower the hook, the key must be in the ON position. The operator must pull and hold the quick-drop button UP. When the quick-drop button is in this position, the stored oil in the accumulator will be released directly to the quick drop clutch. When the quick drop clutch is activated, the hook will lower. The dead engine lower speed is significantly slower than the quick-drop speed.