. OPERATION DETAILED CONTROLS AND GAUGES Hydraulic Oil Level Monitor 3 - 7 Engine Oil Level Monitor This warns monitor A(2) tha t the o il leve l in the engin e oil pan i s too low. If the monitor l amp f lashes, check the o il level in t he engin e oil pan, and a dd oil This warns monitor A(3) tha t the hydraulic oil level i s too low. If the monitor lamp flashes, chec k the hydraulic oil l evel, and add oi Engine Oil Deterioration Monitor (If Equipped) This warns monitor A(4) tha t the engine oil replaced set ti me p ass. If the se t t , t im e (125, 500 H ) passes the engine oil is replaced his amp change engin e oil.