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8-5 Hydraulic safety valve
It is used to prevent overloading. It can cut operations that will increase the load moment (boom
extending, boom lowering and hoist up) and only reserve those operations that will decrease the load
moment (boom retracting, boom raising and hoist down).
8-6 Hydraulic oil filter clogged warning lamp
When the oil filter is clogged, the suction filter or return filter warning lamp comes on. At this
time, stop operation immediately and replace the oil filter clogged.
Chapter 8
8-6
Safety devices
QAY220 All Terrain Crane Operation Manual
Fig. 8-4 Oil filter clogged warning lamp
Courtesy of CraneMarket.com
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