. OPERATION DETAILED CONTROLS AND GAUGES Swing Lock Switch WARNING Machine Push-up Switch WARNING 3 - 36 When the mach ine is traveling under its own po wer, or when the swing is not being operated, alway s set the switch to th e ON position (a). On slopes, eve n when the swing lock switch is at the ON position (a), the weight of the work e quipment may cause t he upper structure to sw ing if the swing control lever is operated in the downhill direction . Switch (5) is use d to lock the upper structure so it cannot swing. (a) ON position (actuated) : The swing lock is always applied, and the upper structur if the swing is condition, the sw up. e will not swing even operated.
In this ing lock lamp lights (b) OFF position (canceled) : The swing lock is applied only when all the work equ are in neutral equipment cont the swing lock i The swing lock seconds after a are placed in th ipment control levers ; when any work rol lever is operated, s canceled. is actuated approx. 5 ll the control levers e neutral position. When using the bo om thrust force to push up the c hassis when moving down from a bench , there is danger t hat the machine may suddenly go down and turn over, so set to the hig h-pressure setting. This switch (6) is used to switch the safety val ve set pressure at the head end of the boom cylinder to two levels. (a) Low pressur e setting:
rust force is weak, so swaying of the chassis is The boom th small during digging operations, and diggi ng can be performed smoothly. This is used for general digging operation s on normal ground, soft rock, or blasted rock. e setting: (b) High pressur The boom th rust force becomes more po werful, so it is easy to twist and sw ing or escape from soft gro igging operations using the in confined areas. und. It is effective in bucket and weight of performing d the machine